[xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the archives, but
I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the sport
tires? (I had some Z-rated name brand tires on a Volvo 745T once, and it was
a not a good set-up - steering was way too quick and the tires followed every
groove in the road.) What of the P4000? Sit too soft? And, do I really
need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these tires
and wish to offer an opinion. (Off-list responses are fine, if appropriate.)

I’d like a bit more steering response and precision over the level I have
now, but don’t want high road noise levels. The car currently has some
oversize 225/70/15 Remington touring tires that are old and aren’t speed
rated at all. They’re a quiet set of doughnuts, but the car drives like a
marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

On Thu, 30 Sep 1999 01:23:56 EDT, BLManning@aol.com said:

Sorry if this is a redundant thread. I’m planning to check the archives, but
I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

I don’t know the specific models of those tyres, but I have Dunlop SP
Stratos 105/65VR15 tyres, and I’m very pleased with them. They’re
extraordinarily quiet (much quieter than the BFGoodriches they replaced),
the tyre pattern looks excellent for water dispersal, and they were pretty
cheap (less than $100 per tyre, including balancing, fitting etc). When I
got them, the tyre place said that I could instead get the Michelins, but
that they were no better than the Dunlops, and cost about $20 more.

Will my ride quality and low noise level go out the door with the sport
tires? (I had some Z-rated name brand tires on a Volvo 745T once, and it was
a not a good set-up - steering was way too quick and the tires followed every
groove in the road.) What of the P4000? Sit too soft? And, do I really
need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these tires
and wish to offer an opinion. (Off-list responses are fine, if appropriate.)

215/65 are a good match, in terms of diameter, for 205/70. I’m running
205/65s without any problems.

Graeme========================================================
Graeme Adamson, @Graeme_Adamson
Jaguar XJ6 SII 1980: http://sherekhan.jumpautos.com
Committee Member: Jaguar Club of South Africa

Pournelle’s Law: If you don’t know what you’re doing,
deal with people who do.

BL,
I have pirelli 400s on my '83…very nice ride and good wear, but less crisp on
aggressive cornering. On my now deceased '82, i have Dunlops…slightly harsher
ride (if harsh can be applied to any XJ6) but quicker turn in…also seem to
wear well. I shy away from michelin due to problems in the '70s…probably
irrational now.

BLManning@aol.com wrote:> Sorry if this is a redundant thread. I’m planning to check the archives, but

I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the sport
tires? (I had some Z-rated name brand tires on a Volvo 745T once, and it was
a not a good set-up - steering was way too quick and the tires followed every
groove in the road.) What of the P4000? Sit too soft? And, do I really
need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these tires
and wish to offer an opinion. (Off-list responses are fine, if appropriate.)

I’d like a bit more steering response and precision over the level I have
now, but don’t want high road noise levels. The car currently has some
oversize 225/70/15 Remington touring tires that are old and aren’t speed
rated at all. They’re a quiet set of doughnuts, but the car drives like a
marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

On our (coughs, mumbles something that could have
come from Coventry only if there’s a Coventry, Japan),
I used Gislaveds with great satisfaction, and now that
they are no longer available have gone to Bridgestones,
again with more than decent results. Anyone have
experience with either brand on a Jag?

Owen Davies

Yes you do need V rated tyes, jags are big heavy beasts and put enormous
strain on tyrewalls which is why you need the V.(Its probably a condition of
your insurance)
I ran a set of Z rated and found two main problems, they tramlined into the
slightest imperfection so badley that they could steer themselves on
motorways and that they wore out very quickly. The pluses are the good looks
and the monumental road holding.
I also ran a set of pilots (V Rated) and found them excellent all rounders.
The 65 versus 75 profile is a matter of personal taste, I like the lower
profile.
Anything would be better than the 225/70’s we only put them on 4x4’s!
I currently run 205 70’s on my 1977 because thats what it came with, but
they do look dumpy.

PJ----- Original Message -----
From: BLManning@aol.com
To: xj@jag-lovers.org
Sent: 30 September 1999 06:23
Subject: [xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the archives,
but
I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the sport
tires? (I had some Z-rated name brand tires on a Volvo 745T once, and it
was
a not a good set-up - steering was way too quick and the tires followed
every
groove in the road.) What of the P4000? Sit too soft? And, do I really
need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated
price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these
tires
and wish to offer an opinion. (Off-list responses are fine, if
appropriate.)

I’d like a bit more steering response and precision over the level I have
now, but don’t want high road noise levels. The car currently has some
oversize 225/70/15 Remington touring tires that are old and aren’t speed
rated at all. They’re a quiet set of doughnuts, but the car drives like a
marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

FWIW, I have used the XGT-4H and, while they are very good performing
tires, especially in the wet, they are also pretty noisy tires. They thump
loudly on expansion strips and howl like mad on textured concrete surfaces.

Note: they were not used on the Jaguar – I had them on an Oldsmobile
Cutlass and currently run them on my wife’s Plymouth Sport Wagon (minivan).
This is the second set on the van. Wifey does not seem to mind the noise.

Burgess
86VdP(federal)

I’d characterize Madame Cat’s (1986 XJ6) steering
as “very precise.” There is some direct “feel” of the
pavement imperfections, etc., mostly attributable,
I think, to urethane rack bushings. The ride is
“quite smooth but not cushy.” On hard cornering,
even with the V rating, there is a little feel that says
there is some (slight) “rolling” happening in the sidewalls.
Overall, we’re extremely happy with Pirelli 4000
215/70/R15. I’m not aware of any significant
“road noise” from the tread. I’d say the urethane
rack bushings will go a long way towards improving
steering responsiveness, and that your idea
about a 215/65/R15 might be just the ticket
if you plan to corner agressivley (otherwise you
are giving up a tad of road clearance, and it
may be a bit more jolting from bumps. I might
be trying them (tires of that size) when I’m ready
to buy again.
This is the best handling non-sports car I’ve
ever driven. Certainly not a marshmallow. Go
for some rack bushings, whatever else you do!
Jeff----------

From: BLManning@aol.com
To: xj@jag-lovers.org
Subject: [xj] More tire questions
Date: Thursday, September 30, 1999 1:23 AM

Sorry if this is a redundant thread. I’m planning to check the archives,
but
I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

No, you don’t need V rated tires for the conditions most of us have to drive
in. I run S rated 215/70 Goodyears on my xj6. No problems whatever, and a
whopping margin of safety. They are better tires in every way than the
Pirelli P5. No one in North America can legally (or even illegally) use the
sustained speeds a V rated tire is built to withstand. In fact, we can’t use
the speeds an H tire is made to withstand, let alone an S tire. V rated
tires are very rare in the US and Canada and expensive when you get them.
Most Jaguars here tool around at less than 70 mph (110 kph?).
Gregory----- Original Message -----
From: Philip Jones phil@smartcomm.freeserve.co.uk
To: BLManning@aol.com; xj@jag-lovers.org
Sent: Thursday, September 30, 1999 2:06 PM
Subject: Re: [xj] More tire questions

Yes you do need V rated tyes, jags are big heavy beasts and put enormous
strain on tyrewalls which is why you need the V.(Its probably a condition
of
your insurance)
I ran a set of Z rated and found two main problems, they tramlined into
the
slightest imperfection so badley that they could steer themselves on
motorways and that they wore out very quickly. The pluses are the good
looks
and the monumental road holding.
I also ran a set of pilots (V Rated) and found them excellent all
rounders.
The 65 versus 75 profile is a matter of personal taste, I like the lower
profile.
Anything would be better than the 225/70’s we only put them on 4x4’s!
I currently run 205 70’s on my 1977 because thats what it came with, but
they do look dumpy.

PJ
----- Original Message -----
From: BLManning@aol.com
To: xj@jag-lovers.org
Sent: 30 September 1999 06:23
Subject: [xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the
archives,
but

I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride vs
handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the sport
tires? (I had some Z-rated name brand tires on a Volvo 745T once, and
it
was

a not a good set-up - steering was way too quick and the tires followed
every
groove in the road.) What of the P4000? Sit too soft? And, do I
really

need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated
price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these
tires
and wish to offer an opinion. (Off-list responses are fine, if
appropriate.)

I’d like a bit more steering response and precision over the level I
have

now, but don’t want high road noise levels. The car currently has some
oversize 225/70/15 Remington touring tires that are old and aren’t speed
rated at all. They’re a quiet set of doughnuts, but the car drives like
a

marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

Dr. Gregory Andrachuk wrote:

No, you don’t need V rated tires for the conditions most of us have to drive
in.

Gregory’s on the mark when it comes to speed ratings & even understates the
matter slightly. One thing I would add is to also remember that those speed
ratings are not only FAR over the speeds you’re going to be able to drive
the car on North American roads, but the speed ratings are for SUSTAINED
speeds which are even MORE difficult to attain on a North American road -
if you try, the roadblocks will force you to slow down if nothing else
does. I’ve had my XJ40 at well over 100 mph, but only for VERY short
periods. Any speed rating over an “S” is overkill. For a heavy car with
potentially capable handling like a Jaguar, pay attention to the load
rating and to the traction rating letter.

However, if you’re still looking at speed ratings, I got a set of Pirelli
6000 Sport tires for my XJ40 for $70/tire at Discount Tires. V rated, as if
that makes a difference. Pigs in the snow but otherwise pretty nice tires.

                                          -Steve A.

'67 E Type Coupe
'76 XJ6C
'91 XJ40

I agree with this statement. After all, doesn’t a Jag with 4 people in it
weigh close to 4000 pounds?>> Yes you do need V rated tyes, jags are big heavy beasts and put enormous

strain on tyrewalls which is why you need the V.(Its probably a condition
of
your insurance)

Sorry to disagree but I can only go on european rules and all my jag buddies
only ever run V or Z. You are making a few assumptions that just dont add up
with respect to the ratings. You do not rate your tyres to the normal
driving speed of your vehicle but the maximum potential of the vehicle. The
rating has very little to do with the speed of the vehicle in a straigth
line but the handling conditions in corners. V rated are more expensive
because the walls are substantially strengthened and so hold their profile
when the forces of the vehicle are applied latteraly in cornering
situations. The strengthened walls hold the tread on the ground and stop you
watching you rear end slide past. Z rated also have extra steel belts in
the treads to stop bowing due to centrifugal speeds, anyone running Z’s will
notice the centre treads wear very quickly.
The speed ratings in Europe caused so much confusion that we now have a
clear set of guidelines with respect to tyres and it is illegal torun
underated tyres onany vehicle.

You may tootle around at 70 but you will go around corners at 50+, in a Jag
the forces generated at the corners are massive and far outside the lateral
forces specified for a S rated tyre.

by the way I drive 30,000 a yer and have never lost a tread and I dont know
anyone who has. There have been a number of postings relating to the treads
peeling on US cars, I can only conclude that you guys are happy to use
underated tyres. It is now implied in all European insurance that we can
only put aftermarket eqipment that is equivalent to the origional
equipment - V RATED.

And yes they cost twice as much as H and S rated but when my life depends on
the inch of rubber at each corner then a few hundred quid is a fair price.

PJ----- Original Message -----
From: Dr. Gregory Andrachuk MGB@UVVM.UVIC.CA
To: Philip Jones <@Philip_Jones>
Cc: xj@jag-lovers.org
Sent: 01 October 1999 02:45
Subject: Re: [xj] More tire questions

No, you don’t need V rated tires for the conditions most of us have to
drive
in. I run S rated 215/70 Goodyears on my xj6. No problems whatever, and a
whopping margin of safety. They are better tires in every way than the
Pirelli P5. No one in North America can legally (or even illegally) use
the
sustained speeds a V rated tire is built to withstand. In fact, we can’t
use
the speeds an H tire is made to withstand, let alone an S tire. V rated
tires are very rare in the US and Canada and expensive when you get them.
Most Jaguars here tool around at less than 70 mph (110 kph?).
Gregory
----- Original Message -----
From: Philip Jones <@Philip_Jones>
To: BLManning@aol.com; xj@jag-lovers.org
Sent: Thursday, September 30, 1999 2:06 PM
Subject: Re: [xj] More tire questions

Yes you do need V rated tyes, jags are big heavy beasts and put enormous
strain on tyrewalls which is why you need the V.(Its probably a
condition
of

your insurance)
I ran a set of Z rated and found two main problems, they tramlined into
the
slightest imperfection so badley that they could steer themselves on
motorways and that they wore out very quickly. The pluses are the good
looks
and the monumental road holding.
I also ran a set of pilots (V Rated) and found them excellent all
rounders.
The 65 versus 75 profile is a matter of personal taste, I like the lower
profile.
Anything would be better than the 225/70’s we only put them on 4x4’s!
I currently run 205 70’s on my 1977 because thats what it came with, but
they do look dumpy.

PJ
----- Original Message -----
From: BLManning@aol.com
To: xj@jag-lovers.org
Sent: 30 September 1999 06:23
Subject: [xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the
archives,
but

I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride
vs

handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the
sport

tires? (I had some Z-rated name brand tires on a Volvo 745T once, and
it
was

a not a good set-up - steering was way too quick and the tires
followed

every

groove in the road.) What of the P4000? Sit too soft? And, do I
really

need a V-rated tire on an old XJ? The Dunlops? I prefer the H-rated
price.
Any thoughts on the 215/65 vs 205/70 issue? Does any lister run these
tires
and wish to offer an opinion. (Off-list responses are fine, if
appropriate.)

I’d like a bit more steering response and precision over the level I
have

now, but don’t want high road noise levels. The car currently has
some

oversize 225/70/15 Remington touring tires that are old and aren’t
speed

rated at all. They’re a quiet set of doughnuts, but the car drives
like
a

marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

Phil: I don’t think you took my point: In Canada and the US we simply CANNOT
use the potential of these cars, which potential is the reason you claim the
V is necessary. These cars were designed and built for sustained 100
mph-plus runs, the kind you CAN have in Europe in some places, and the
glove-box sticker proves this. These speeds are not possible here, and
therefore the tires that are designed for these speeds are unnecessary. I
have used my S rated Goodyears (215/70) at sustained speeds of 75 mph, along
with the cornering that goes with these speeds. These tires are rated for
continuous running at speeds MUCH higher than this, and the sidewalls can
easily support the weight and cornering loads necessary. But if I were
driving the autobahn I would definitely fit V rated tires; I would NOT fit
Pirelli tires. I have now experienced belt shift on two P5 tires, and never
on any other tire. The Jaguar is not the only 4000 lb car on the road; other
cars of the same weight, driven at the same speeds use tires rated at H or
S. Tire failures on the highway are quite rare, regardless of the speed
rating because our useable speeds are so low, lamentably.
Gregory----- Original Message -----
From: Philip Jones phil@smartcomm.freeserve.co.uk
To: Dr. Gregory Andrachuk <@Gregory_Andrachuk>
Cc: xj@jag-lovers.org
Sent: Friday, October 01, 1999 3:02 PM
Subject: Re: [xj] More tire questions

Sorry to disagree but I can only go on european rules and all my jag
buddies
only ever run V or Z. You are making a few assumptions that just dont add
up
with respect to the ratings. You do not rate your tyres to the normal
driving speed of your vehicle but the maximum potential of the vehicle.
The
rating has very little to do with the speed of the vehicle in a straigth
line but the handling conditions in corners. V rated are more expensive
because the walls are substantially strengthened and so hold their profile
when the forces of the vehicle are applied latteraly in cornering
situations. The strengthened walls hold the tread on the ground and stop
you
watching you rear end slide past. Z rated also have extra steel belts in
the treads to stop bowing due to centrifugal speeds, anyone running Z’s
will
notice the centre treads wear very quickly.
The speed ratings in Europe caused so much confusion that we now have a
clear set of guidelines with respect to tyres and it is illegal torun
underated tyres onany vehicle.

You may tootle around at 70 but you will go around corners at 50+, in a
Jag
the forces generated at the corners are massive and far outside the
lateral
forces specified for a S rated tyre.

by the way I drive 30,000 a yer and have never lost a tread and I dont
know
anyone who has. There have been a number of postings relating to the
treads
peeling on US cars, I can only conclude that you guys are happy to use
underated tyres. It is now implied in all European insurance that we can
only put aftermarket eqipment that is equivalent to the origional
equipment - V RATED.

And yes they cost twice as much as H and S rated but when my life depends
on
the inch of rubber at each corner then a few hundred quid is a fair price.

PJ

----- Original Message -----
From: Dr. Gregory Andrachuk <@Gregory_Andrachuk>
To: Philip Jones phil@smartcomm.freeserve.co.uk
Cc: xj@jag-lovers.org
Sent: 01 October 1999 02:45
Subject: Re: [xj] More tire questions

No, you don’t need V rated tires for the conditions most of us have to
drive
in. I run S rated 215/70 Goodyears on my xj6. No problems whatever, and
a

whopping margin of safety. They are better tires in every way than the
Pirelli P5. No one in North America can legally (or even illegally) use
the
sustained speeds a V rated tire is built to withstand. In fact, we can’t
use
the speeds an H tire is made to withstand, let alone an S tire. V rated
tires are very rare in the US and Canada and expensive when you get
them.

Most Jaguars here tool around at less than 70 mph (110 kph?).
Gregory
----- Original Message -----
From: Philip Jones phil@smartcomm.freeserve.co.uk
To: BLManning@aol.com; xj@jag-lovers.org
Sent: Thursday, September 30, 1999 2:06 PM
Subject: Re: [xj] More tire questions

Yes you do need V rated tyes, jags are big heavy beasts and put
enormous

strain on tyrewalls which is why you need the V.(Its probably a
condition
of

your insurance)
I ran a set of Z rated and found two main problems, they tramlined
into

the

slightest imperfection so badley that they could steer themselves on
motorways and that they wore out very quickly. The pluses are the good
looks
and the monumental road holding.
I also ran a set of pilots (V Rated) and found them excellent all
rounders.
The 65 versus 75 profile is a matter of personal taste, I like the
lower

profile.
Anything would be better than the 225/70’s we only put them on 4x4’s!
I currently run 205 70’s on my 1977 because thats what it came with,
but

they do look dumpy.

PJ
----- Original Message -----
From: BLManning@aol.com
To: xj@jag-lovers.org
Sent: 30 September 1999 06:23
Subject: [xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the
archives,
but

I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the ride
vs

handling dilemma. I’m considering a few brands and sizes and would
appreciate feedback from listers with any direct experience on this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport” tire;
Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,” or
Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the
sport

tires? (I had some Z-rated name brand tires on a Volvo 745T once,
and

it

was

a not a good set-up - steering was way too quick and the tires
followed

every

groove in the road.) What of the P4000? Sit too soft? And, do I
really

need a V-rated tire on an old XJ? The Dunlops? I prefer the
H-rated

price.

Any thoughts on the 215/65 vs 205/70 issue? Does any lister run
these

tires

and wish to offer an opinion. (Off-list responses are fine, if
appropriate.)

I’d like a bit more steering response and precision over the level I
have

now, but don’t want high road noise levels. The car currently has
some

oversize 225/70/15 Remington touring tires that are old and aren’t
speed

rated at all. They’re a quiet set of doughnuts, but the car drives
like
a

marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids

Arrrr come on iv seen pictures, you got some pretty deserted roads over
there.
Do yourself a favour.
1 Get some V rateds.
2. Find a quiet straight road( 4 to 5 am at sunrise works best )
3. Drive down it about 5 miles to check suitability and lack of plod.
4. Turn around and cruise at about 100 mph.
5. Kick it down and hold it.
6. Stop grinning and go home to a wonderful day.

Lie to drive, drive to live…

PJ----- Original Message -----
From: Dr. Gregory Andrachuk MGB@UVVM.UVIC.CA
To: Philip Jones <@Philip_Jones>
Cc: xj@jag-lovers.org
Sent: 01 October 1999 23:35
Subject: Re: [xj] More tire questions

Phil: I don’t think you took my point: In Canada and the US we simply
CANNOT
use the potential of these cars, which potential is the reason you claim
the
V is necessary. These cars were designed and built for sustained 100
mph-plus runs, the kind you CAN have in Europe in some places, and the
glove-box sticker proves this. These speeds are not possible here, and
therefore the tires that are designed for these speeds are unnecessary. I
have used my S rated Goodyears (215/70) at sustained speeds of 75 mph,
along
with the cornering that goes with these speeds. These tires are rated for
continuous running at speeds MUCH higher than this, and the sidewalls can
easily support the weight and cornering loads necessary. But if I were
driving the autobahn I would definitely fit V rated tires; I would NOT
fit
Pirelli tires. I have now experienced belt shift on two P5 tires, and
never
on any other tire. The Jaguar is not the only 4000 lb car on the road;
other
cars of the same weight, driven at the same speeds use tires rated at H or
S. Tire failures on the highway are quite rare, regardless of the speed
rating because our useable speeds are so low, lamentably.
Gregory
----- Original Message -----
From: Philip Jones <@Philip_Jones>
To: Dr. Gregory Andrachuk MGB@UVVM.UVIC.CA
Cc: xj@jag-lovers.org
Sent: Friday, October 01, 1999 3:02 PM
Subject: Re: [xj] More tire questions

Sorry to disagree but I can only go on european rules and all my jag
buddies
only ever run V or Z. You are making a few assumptions that just dont
add
up

with respect to the ratings. You do not rate your tyres to the normal
driving speed of your vehicle but the maximum potential of the vehicle.
The
rating has very little to do with the speed of the vehicle in a straigth
line but the handling conditions in corners. V rated are more expensive
because the walls are substantially strengthened and so hold their
profile

when the forces of the vehicle are applied latteraly in cornering
situations. The strengthened walls hold the tread on the ground and stop
you
watching you rear end slide past. Z rated also have extra steel belts
in

the treads to stop bowing due to centrifugal speeds, anyone running Z’s
will
notice the centre treads wear very quickly.
The speed ratings in Europe caused so much confusion that we now have a
clear set of guidelines with respect to tyres and it is illegal torun
underated tyres onany vehicle.

You may tootle around at 70 but you will go around corners at 50+, in a
Jag
the forces generated at the corners are massive and far outside the
lateral
forces specified for a S rated tyre.

by the way I drive 30,000 a yer and have never lost a tread and I dont
know
anyone who has. There have been a number of postings relating to the
treads
peeling on US cars, I can only conclude that you guys are happy to use
underated tyres. It is now implied in all European insurance that we can
only put aftermarket eqipment that is equivalent to the origional
equipment - V RATED.

And yes they cost twice as much as H and S rated but when my life
depends
on

the inch of rubber at each corner then a few hundred quid is a fair
price.

PJ

----- Original Message -----
From: Dr. Gregory Andrachuk MGB@UVVM.UVIC.CA
To: Philip Jones <@Philip_Jones>
Cc: xj@jag-lovers.org
Sent: 01 October 1999 02:45
Subject: Re: [xj] More tire questions

No, you don’t need V rated tires for the conditions most of us have to
drive
in. I run S rated 215/70 Goodyears on my xj6. No problems whatever,
and
a

whopping margin of safety. They are better tires in every way than the
Pirelli P5. No one in North America can legally (or even illegally)
use

the

sustained speeds a V rated tire is built to withstand. In fact, we
can’t

use

the speeds an H tire is made to withstand, let alone an S tire. V
rated

tires are very rare in the US and Canada and expensive when you get
them.

Most Jaguars here tool around at less than 70 mph (110 kph?).
Gregory
----- Original Message -----
From: Philip Jones <@Philip_Jones>
To: BLManning@aol.com; xj@jag-lovers.org
Sent: Thursday, September 30, 1999 2:06 PM
Subject: Re: [xj] More tire questions

Yes you do need V rated tyes, jags are big heavy beasts and put
enormous

strain on tyrewalls which is why you need the V.(Its probably a
condition
of

your insurance)
I ran a set of Z rated and found two main problems, they tramlined
into

the

slightest imperfection so badley that they could steer themselves on
motorways and that they wore out very quickly. The pluses are the
good

looks

and the monumental road holding.
I also ran a set of pilots (V Rated) and found them excellent all
rounders.
The 65 versus 75 profile is a matter of personal taste, I like the
lower

profile.
Anything would be better than the 225/70’s we only put them on
4x4’s!

I currently run 205 70’s on my 1977 because thats what it came with,
but

they do look dumpy.

PJ
----- Original Message -----
From: BLManning@aol.com
To: xj@jag-lovers.org
Sent: 30 September 1999 06:23
Subject: [xj] More tire questions

Sorry if this is a redundant thread. I’m planning to check the
archives,
but

I thought I’d give current listers a shot at this.

I’m purchasing new tires for my '78 XJ6L and have come upon the
ride

vs

handling dilemma. I’m considering a few brands and sizes and
would

appreciate feedback from listers with any direct experience on
this.

I’m considering:

Michelin Pilot XGT-4H in 215/65/15 H rated - more of a “sport”
tire;

Pirelli P4000 in either 215/65/15 or 205/70/15 - more “touring,”
or

Dunlop D60A2 216/65/15 H - rated - a compromise (and less $).

Will my ride quality and low noise level go out the door with the
sport

tires? (I had some Z-rated name brand tires on a Volvo 745T once,
and

it

was

a not a good set-up - steering was way too quick and the tires
followed

every

groove in the road.) What of the P4000? Sit too soft? And, do I
really

need a V-rated tire on an old XJ? The Dunlops? I prefer the
H-rated

price.

Any thoughts on the 215/65 vs 205/70 issue? Does any lister run
these

tires

and wish to offer an opinion. (Off-list responses are fine, if
appropriate.)

I’d like a bit more steering response and precision over the level
I

have

now, but don’t want high road noise levels. The car currently has
some

oversize 225/70/15 Remington touring tires that are old and aren’t
speed

rated at all. They’re a quiet set of doughnuts, but the car
drives

like

a

marshmallow!

Thanks for your input.

Barry Manning
'78 XJ6
'65 MGB
'62 Corvair…
and a Volvo for the kids