[Lumps!] which 18" chrome wheels for 84 XJ6?

I’m looking at getting some 18" chrome wheels for my lumped 84 XJ6 VDP.

What width would be best? I’d like to run the widest possible tire (all 4
matching). I assume the front is the limiting factor?
A 235 tire would be great if possible…7-8" wheel fit in there ok?

I’m ok if the tire projects out a little more than stock.

Thanks for the help!

Dan

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In reply to a message from Daniel Koster sent Mon 6 Aug 2007:

a 18x8 with P30 to P35 offset (backspacing 5.7 to 5.9 inches)
should fit on a series 3 sedan. Rob Wade has runs 9s on the rear
of his XJS. You’ll start to run into rear arch lip issues if you
run much less than P30. 235/45/18 would be about the same height
as the orig 205/70/15, or if you currently run 205/65/15, 235/40/18.

Cheers, Andrew Robertson, New Zealand
Xj s1 454tt, Xj s1 383–
The original message included these comments:

I’m looking at getting some 18’’ chrome wheels for my lumped 84 XJ6 VDP.
What width would be best? I’d like to run the widest possible tire (all 4
matching). I assume the front is the limiting factor?
A 235 tire would be great if possible…7-8’’ wheel fit in there ok?


Andrew Robertson
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In reply to a message from Andrew Robertson sent Tue 7 Aug 2007:

33mm offset is the ticket. I run the XJR 17’‘x8’’ rims on my 89 xjs.
I widened the rear (all in the backspacing) 1’’, so the offset
becomes 57.4mm. I have 1/2’’ clearance on the inner wheelwell and on
the outer wheel lip. No spacers. 275/40/17 tire on the rear,
245/45/17 on the front.–
Rob Wade
Windsor Ontario, Canada
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So, 17x8 with 33mm offset will work with 245/45/17 all around…?
…that makes the tire diameter 25.7"

Stock being 215/70/15 = 26.8"

I am looking at a similar setup, larger wheel…18x8, 33mm offset,
245/40/18 = 25.7"

I’d like all 4 wheels to be the same.

How does yours handle? Last time I had a car with bigger wheels on back,
the handling suffered.

Thanks for the help.

Dan----- Original Message -----
From: “Rob Wade” robsxjs@hotmail.com
To: lumps@jag-lovers.org
Sent: Tuesday, August 07, 2007 6:05 AM
Subject: Re: [Lumps!] which 18" chrome wheels for 84 XJ6?

In reply to a message from Andrew Robertson sent Tue 7 Aug 2007:

33mm offset is the ticket. I run the XJR 17’‘x8’’ rims on my 89 xjs.
I widened the rear (all in the backspacing) 1’’, so the offset
becomes 57.4mm. I have 1/2’’ clearance on the inner wheelwell and on
the outer wheel lip. No spacers. 275/40/17 tire on the rear,
245/45/17 on the front.

Rob Wade
Windsor Ontario, Canada
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Andrew,

Thanks for the backspacing info. I’m happy to run a slightly smaller wheel
(diameter). My speedo is off already (runs under…smaller tire will bring
it closer to actual speed).

Have any suggestions for what kind of wheel design? I’d like “more chrome
than air” and not the other way around. What looks good on an ole Jag?

Thanks!

Dan----- Original Message -----
From: “Andrew Robertson” kinrob@xtra.co.nz
To: lumps@jag-lovers.org
Sent: Tuesday, August 07, 2007 12:03 AM
Subject: Re: [Lumps!] which 18" chrome wheels for 84 XJ6?

In reply to a message from Daniel Koster sent Mon 6 Aug 2007:

a 18x8 with P30 to P35 offset (backspacing 5.7 to 5.9 inches)
should fit on a series 3 sedan. Rob Wade has runs 9s on the rear
of his XJS. You’ll start to run into rear arch lip issues if you
run much less than P30. 235/45/18 would be about the same height
as the orig 205/70/15, or if you currently run 205/65/15, 235/40/18.

Cheers, Andrew Robertson, New Zealand
Xj s1 454tt, Xj s1 383

The original message included these comments:

I’m looking at getting some 18’’ chrome wheels for my lumped 84 XJ6 VDP.
What width would be best? I’d like to run the widest possible tire (all
4
matching). I assume the front is the limiting factor?
A 235 tire would be great if possible…7-8’’ wheel fit in there ok?


Andrew Robertson
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

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Someone enlighten me. Is there an advantage to go from a 15" wheel to the
larger wheels? It seems that there is some sort of buying frenzy about such
issues and honestly it does not make sense to me. I can imagine that in the
younger set that the overly tall tires are just style, but what are the
reasons for logical people to do such changes.

Admittedly, in my experience with my three Jags over the last 12 years of
participation on this list, I have found in all three cases that staying
with a high quality tire, in the size called for in the glove box manual,
was the best handling tire. I went up in size, but not over the 15" spec
rim size. For the XJ12L the best tire was the stock 205X70, the XJ6 was
best with a 215X65 and now the XJ-S has 215X70s on it and I am not
completely happy with that. I am presuming that the 205X70 in a good
Pirelli road rated tire is going to be the best tire for the XJ-S (this is
what they call for in the manual).

I also have to add, that on the Mustang Resto-Mod, I am running 215X70X15s
there, but I had to go up 1" on size and to a 8" rim to get around the
modification to disk brakes from the old drum set up. I have yet to put
this on the road, so the jury is out on the effect in handling the increase
will be.

Anyhow, could someone explain the benefits of going to the 17", 18" and I
see sometimes a 20" rim on cars designed for 15" set ups?

“Smitty”
J. Rick Smith of Phoenix, Arizona
1977 Jaguar XJ-S (350ci/TH350 Conversion)

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In reply to a message from Daniel Koster sent Tue 7 Aug 2007:

Your #'s (unlike my poor addition the this morning)are correct.
There is a drawback to the shorter tire on these cars and that is
tramlining. These cars like to follow the cracks in the road when
your go to a shorter tire.–
Rob Wade
Windsor Ontario, Canada
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Guys have been wanting more rubber on the road for years, and the lower,
stiffer sidewalls often add quite a bit of sharpness to the steering. I can
go along with that. And darn near any car looks better with a larger tire,
IMHO. :slight_smile:

That being said I think there’s a point of limited returns on some of this
stuff and the ultra low profile tires (50-40-30 series) have some
disadvantages—but those who like 'em are willing to tolerate them. An
increased likelihood of tramlining is one of them. Add to that the car (and
driver) gets beaten to death any time you run over so much as a bottle cap.
And, though not professing to be an expert here, I don’t think any of the
tire offerings in such sizes have anything resembling long tread life.

On a purely subjective note I think some of these modern tire-wheel
combinations look silly----like a rubber band stretched over a wagon wheel.
And some of the “ultra bling” styles don’t work well with older,
conservative Jaguar styling. But, to each his own, of course.

Doug Dwyer
Longview Washington USA
1995 XJR

Someone enlighten me. Is there an advantage to go from a 15" wheel to the
larger wheels? It seems that there is some sort of buying frenzy about
such
issues and honestly it does not make sense to me.

Anyhow, could someone explain the benefits of going to the 17", 18" and I
see sometimes a 20" rim on cars designed for 15" set ups?

//please trim quoted text to context onlyFrom: “J. Rick Smith” smith.76xj-s@s133968062.onlinehome.us

Thanks for the info. Perhaps a 245/45/18 (26.7") would be better?
(a bit more expensive…but available)

Are there any 50k-70k tires in this size that are good? I would love to put
some Pirellis on…but am concerned about the “no treadlife warranty”. How
long do they last?

Dan

In reply to a message from Daniel Koster sent Tue 7 Aug 2007:

Your #'s (unlike my poor addition the this morning)are correct.
There is a drawback to the shorter tire on these cars and that is
tramlining. These cars like to follow the cracks in the road when
your go to a shorter tire.

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I have run the P3s and now the P5s [?] I think that is what they are called.
Seem to last forever for me.

“Smitty”
J. Rick Smith of Phoenix, Arizona
1977 Jaguar XJ-S (350ci/TH350 Conversion)-----Original Message-----
From: owner-lumps@jag-lovers.org [mailto:owner-lumps@jag-lovers.org] On
Behalf Of Daniel Koster
Sent: Tuesday, August 07, 2007 6:57 AM
To: lumps@jag-lovers.org
Subject: Re: [Lumps!] which 18" chrome wheels for 84 XJ6?

Thanks for the info. Perhaps a 245/45/18 (26.7") would be better?
(a bit more expensive…but available)

Are there any 50k-70k tires in this size that are good? I would love to put

some Pirellis on…but am concerned about the “no treadlife warranty”. How
long do they last?

Dan

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In reply to a message from J. Rick Smith sent Tue 7 Aug 2007:

All:

Car guys are never happy with the wheel tire combination that came
on the car. Nurtured and harvested by tire companies and whhel
companies!

My first car had 30 x 31/2 ‘’ wood spokers. I considered it a great
step forward to 600 x 16’s!

My 4 x 4 grew steadliy on about 4 of them to 33 x 15. The last one
remains at 215. x 15.

My Roadster hot rod was 16 inch wires with 600’s up front and 650’s
in back.

The low rider guys seek smaller and smaller wires!

Somewhere in the mix is a combination with looks and roadability.

The big 20’s seen on a lot of new stuff just looks like a throw
back. More wheel less rubber seems to lead to possible better
turning at the expense of over all ride comfort. Good pn the road
race course, ? on the streets and freeways.

& of course, a lot of it is purely subjective.

Carl–
Carl Hutchins
Walnut Creek, California, United States
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Smitty

I think it’s to be able to buy a “V” rated tyre, in 15" they are getting
like hen’s teeth and rocking horse sh*t here in Oz. There’s a much bigger
selection in the larger wheel sizes.

Kevin
Brisbane QLD
Australia
74 XJ12L “Ted”
83 XJS “Carmel”
83 XJS “Joanna”-----Original Message-----
From: owner-lumps@jag-lovers.org [mailto:owner-lumps@jag-lovers.org] On
Behalf Of J. Rick Smith
Sent: Tuesday, 7 August 2007 11:30 PM

Someone enlighten me. Is there an advantage to go from a 15" wheel to the
larger wheels? It seems that there is some sort of buying frenzy about such
issues and honestly it does not make sense to me. I can imagine that in the
younger set that the overly tall tires are just style, but what are the
reasons for logical people to do such changes.

Anyhow, could someone explain the benefits of going to the 17", 18" and I
see sometimes a 20" rim on cars designed for 15" set ups?

“Smitty”
J. Rick Smith of Phoenix, Arizona
1977 Jaguar XJ-S (350ci/TH350 Conversion)

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In reply to a message from cadjag sent Tue 7 Aug 2007:

With my 45 series, 17’’ rims/tires I do experience some tramlining.
For me its not an issue because I know what to expect out of it. My
wife on the other hand, will not drive the car anymore. There is a
small amount of ride quality sacrifice, but everyone who rides in
my xjs, remarks on how good the car rides. Someone on the xjs forum
commented a few weeks back that he has run both 17’s and 18’s on
the car, and the difference when he switched to the 18’s in
handling and ride quality (suffered) was enough to make him put the
17’s back on the car. Personally I believe a large part of the
tramlining issue is due to the rack being behind the rear
suspension. I believe if it was out in front, and the angle of the
inner tie rods was straighter leading up to the spindles, this
wouldn’t be a problem. I plan on looking really hard at this issue.
Does anyone know the outside to outside (rim mount surface)
measurement is on the front suspension?–
Rob Wade
Windsor Ontario, Canada
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I think the most you can expect from high performance
tires like these (in low profiles) is somewhere in the
20k-30k range in mileage, at most. Any more than that
and the tire is likely too hard, which contradicts the
reason to have them in the first place (good grip,
responsiveness, etc.,.) But not to worry- if you shop
for tires properly, they’re less expensive than you
think. I have a set of 18" XJR wheels here (the
Asterioid style) and f 245-45-18 Sumitomo HTRz’s were
only $78 each, brand new. That’s cheap- less than $400
for a full set, delivered to my door. So if they last
only 20,000 miles, who cares- they had a good review
on Tire Rack, and even buying a second set would still
be less than a full set of Pirelli’s. And by the way,
those Pirelli’s probably won’t last more than 20-30k
miles either…

But you can be sure to forget about any 40k+ mile life
expectancy anyway from a real performance tire- it
just isn’t realistic…

…but am concerned about the “no> treadlife warranty”.


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In reply to a message from Doug Dwyer sent Tue 7 Aug 2007:

Lots of advantages/disadvantages to going to a larger-diameter
wheel. Usually, if you go up a rim size, you go down an aspect
ratio number i.e. 16’’ rim/60 series tire, 17’’ rim/50 series, etc.
to keep overall diameter the same. Tread width gets wider too. The
things to think about include (but are not limited to):

Advantages: As Doug pointed out, handling gets ‘sharper’, and
unsprung weight goes down. The shorter tire sidewall helps the most
here, but the lower tire/wheel weight contributes to this also. But
you can easily reach the point of diminishing returns.

Disadvantages: That same shorter/stiffer tire sidewall that
improves handling also doesn’t absorb bumps as well, so the bigger
the rim and/or shorter sidewall, the worse the ride quality will
get. If all you drive is very smooth, well maintained roads, this
may not be an issue, but if road surface quality is poor, you’ll
definitely know it. And tires with very low aspect ratios (45, 40,
35) are much more likely to substain tire/rim damage if you hit
potholes. Saleen put 18’’ rims/40 series tires on one of their
Mustangs some years ago, and had so many reports of tire/rim
failure from their east-coast customers that they recalled the cars
and fitted a 17’’ combo.

You can increase rim size 1’’ usually with no serious change of ride
quality and noticeable improvement in handling, but once you go
beyond that expect some differences.

Another thing to look out for is tire wear; my experience has been
that as the aspect ratio goes down, so does the DOT ‘wear number’.
Even within the same tire ‘line’, the lower ratio tires don’t wear
as well. I’ve seen reductions of up to 50%. So if tire mileage is
important, look at this carefully.

And I would personally NEVER buy a chrome-plated aluminum wheel, as
the plating will fail in wet conditions after 4-5 years (or less)
unless you’re a fanatic about keeping them clean (front AND back).–
The original message included these comments:

Guys have been wanting more rubber on the road for years, and the lower,
stiffer sidewalls often add quite a bit of sharpness to the steering. I can


Why?
Yelm Washington, United States
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In reply to a message from A sent Tue 7 Aug 2007:

I have ‘‘h’’ rated Hankooks on mine. 275/40/17-$76.00 245/45/17-
$68.00. Been on the car two summers. No complaints about tread wear
here.–
Rob Wade
Windsor Ontario, Canada
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I have to agree with Andrew.

High performance tires come in many flavors and designs which can surely
impact wear but in general they are not known for long treadlife. And let’s
not forget that those buying them are more likely than others to be
aggress…um…er…“sporty” drivers :slight_smile:

I bought my XJR at 30k miles. The Goodyear Eagle-somethings that were on it
were pretty well worn and the spare still had one of the original P-Zero
Pirellis which was almost totally bald. So, in 30k miles, the car had,
essentially, gone through two sets of tires. Maybe I could’ve gone another
4k on the Eagles in terms of treadlife but they had gone lumpy and needed
replacing on that basis.

I’m thinking the BF Goodrich KDWS tires I am currently running might go 20k
miles (a fair bit less on the rear ) and they have one of the
higher treadwear ratings of the various high performance offerings.

Doug Dwyer
Longview Washington USA
1995 XJR

But you can be sure to forget about any 40k+ mile life
expectancy anyway from a real performance tire- it
just isn’t realistic…

//please trim quoted text to context onlyFrom: “A” andrew_jag@yahoo.com

In reply to a message from Doug Dwyer sent Tue 7 Aug 2007:

Personally the limit on ride quality is on a 19’’ wheel.
Beyond that is terrible as there is no sidewall. CCW will
make 19X9 and 19X8 for the Jag. They are polished aluminum
and about $2400 per set. I sent dimensional details to them.
I hope to order a set for my 94 XJS in the next month. with
Toyo tires.–
lasstss
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In reply to a message from lasstss sent Wed 8 Aug 2007:

ditto all the comments about trade-offs when sidewall height goes
down on larger rims. When I run on tarmac rally stages where the
road surface is sealed but terribly patchy and bumpy (and I need a
good compromise betweeb grip and compliance) I use 235/45/ZR17 on
17x8.5 rims… and a 4mm steel plate sump guard… ;-). At
the track I go for 245/40 which is the biggest tyre that works
properly on a 8.5 inch rim. The 235s have a decent sidewall
height, reasonable ride/comfort even in a comp car and are much
better/sharper than 70 or 65 profile 15s.

Rim design is a matter of taste - personally I hate the all chrome
prism design wheels, and prefer selected Jag OEM XJR wheels (the
one’s Rob runs being my favourite) or the classic 5 spoke design
like the simmons FR17 or similar. I also like the minilites I run
on the road car but they are not available in large diameter.

Cheers, Andrew Robertson, New Zealand
Xj s1 454tt, Xj s1 383–
Andrew Robertson
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In reply to a message from J. Rick Smith sent Tue 7 Aug 2007:

I’d say logical people buy a sports car or sports sedan for
the handling. Balloons don’t handle.

The ‘‘20+ wheels on an economy car or luxobarge’’ fad is
another thing entirely. But you asked about logical people…–
The original message included these comments:

Someone enlighten me. Is there an advantage to go from a 15’’ wheel to the
larger wheels? It seems that there is some sort of buying frenzy about such
issues and honestly it does not make sense to me. I can imagine that in the
younger set that the overly tall tires are just style, but what are the
reasons for logical people to do such changes.


sbs9
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