Tyres: 215/70R15 vs 215/65R15

Addco #588 and with a cost of about €220 including shipping and droplinks, bushings not even that bad.
Droplinks, new, are €25, bushings €15, and the brackets and rubber that mount on the car are probably around $50 without looking it up. Used swaybars are not free either so if sold on ebay there would be a price difference of less than 50 bucks, I guess - and all new parts.
If the rear bar should balance the car a little is it difficult to mount the XJS-bar; I assume Jaguar for once didn’t include mounting locations for it, but apart from that it should be drop-in?

If it were me, I would stay with the large tyres for now and do the swaybar first, as I still feel that the cars do that '70s land-yacht thing around the corners more than I like. The look of the 215/70 was very good; I’m not going to say anything about Doug’s now but at the rear wheel arches there is quite an impressive difference; also this is where my change hurt (I can’t say anything about the handling; it was the difference of driving over a ploughed field vs. a proper road; the tyres were old and defect). But the speed vs. GPS didn’t change much. Aristides, as no one mentioned it yet, I like your colour!

Not a difficult installation but I wouldn’t quite call it a ‘drop-in’.

You’ll need radius arms with the little brackets to accept the end links. Or, fabricate brackets. Or, as I did, used Corvette brackets welded to the radius arms.

You’ll need to remove some of the heat insulation board from the underside of the body to mount the U-brackets that hold the bar to the body of the car. The area of the body where the brackets are attached isn’t reinforced or particularly thick so I fabricated some .125" thick reinforcing plates.

New bushings for the end links and U-brackets, of course. That’s easy.

XJS rear bars are a bit hard to find, yes. Not all XJSs used them. In fact, most didn’t.
But I got lucky and found one on Ebay from a UK seller who had several on hand. $150 shipped to the USA.

Addco also makes a rear bar but, IMO, it’s too big. I had one on my XJS and wasn’t happy and switched to a Jaguar rear bar.

Cheers
DD

Thank you for your replies gentlemen.

That’s good to know. One question answered!

Thanks David, me too !
Desperately needs a respray though… Hopefully this winter…

Yes, swaybars… in the future maybe but I’m not there yet, and tyres must be changed soon.

Point noted David.

Yes, that is my concern.

Any more pictures anybody ?

Best,
Aristides

These photos show my 205/70 15’s. Maybe next time I’ll go with 215’s.

Thanks for the photos Phillip !
Really appreciate it.

Best
Aristides

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Update:

So, I decided to replace my 215/70-15 with 215/65-15 and got the Fulda EcoControl HP 96H at a very decent price.

Aesthetics:
Love the look, not so much of a gap between the tire and fender and the wheels look so much nicer with less rubber.
On plus, I opted with Rim Protection tires witch also improved the looks as the tire seems wider and fill the arch better.
The car looks longer and much more elegant.

Driving;
Crispier, with a more “modern” feel, albeit a little bit harsher on bumps.
But, as Frank said on an other post, could be the difference of the rubber compound and wall stiffness.
Also my old tires had the habit of loosing pressure, so they were under-inflated most of the time.

Overall, even though it has been only a few days, I am very happy with the change.

All the best,
Aristides

Looks are looks and feel is feel. As in many things, to each his own.

New for old usually meets better on each. tires included.

It looks great.

I prefer more rubber less steel or alloy. The taste thing.

The wheel wells in my Jaguar are well filed with
215 x 70 x 15 on XJS style lattice wheels. Pleasing to me in looks and feel.

A few months ago, the ancient “touring” tires on my old Jeep were deemed done for and no longer safe. Just too old.

I went shopping. Decided to treat me and the Jeep to proper tires. Back to original spec Goodyear Wranglers> M & S capable. And, wonder on wonder match the virgin spare ion it’s boot!!

The Jeep looks good and feels good. The taste thing…

Each might well be my last rubber decisions.

Carl

Oh, my, can I relate!!!

Thats why the DD, dear DD, gets a bath once a month.

Maybe.

:crazy_face:

They look very decent, but H on a V12? Come on! I know; they handle well and look good; all you need.
Also never realized you had a federal car. As it’s a V12 it can’t be US, what’s the story?

I recently found Kumho Ecowing, V-rated and 215/65 at reasonable pricing, on a nearby XJS.
But they are summer tyres and that is uncomfortable as I don’t want to shell out money for a second set of rims - yet.

Do the 215/65 fit in the spare well? My 215/70 is too fat and just barely fits; not very nice if I was asked…

David

Please elaborate. I am in the process of re-tyreing and I have a V12. Thank you,
Phillip

IIRC, H rated tires are rated to 112 mph.

Plenty safe for 99% of driving in cities.

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H = 130 mph rating

S = 112

T = 118

The long prevailing consensus is that the higher speed rating tires have stronger, stiffer casings. I have no reason to doubt that but oft wondered what other things, if any, make up the difference.

A lot of people confuse load ratings with speed ratings. Two different specifications and meanings…but in many cases they go hand-in-hand, with the higher speed rating also having a higher load rating. Again presumably due to the stronger casings.

The overwhelming majority of Jags I see on the road are being driven as though they were made out of glass so a high-spec, performance-oriented tire would probably be wasted money.

Cheers
DD

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A couple years ago I read an analysis by the NHTSA which attributed [something like] 4% of all accidents to tire failure. Of those, the vast majority (75%?) were caused by under-inflation. Incorrect tires wasn’t even mentioned as measurable cause of accidents.

I’m not advocating utter nonchalance regarding tires but statistically they barely move the needle as far as safety goes…at least in the USA.

Cheers
DD

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**
I take wash once a year, Paul - whether I need it or not…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)
**

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In Germany it’s mandatory that the summer tyres exceed the car‘s capability. For winter- and all-year tyres you have to place a sticker on the dash if otherwise, so people have „do not exceed 240/210/190kph“ stickers in their cars.
I don’t see any reason to do more than 200 in all situations, so it doesn’t matter. Sidewall strength should not be an issue and one could instead go to an 98 or 100 losd rating etc.

H = 210km/h - 130mph, indeed just enough for city driving !!!

Fastest I ever took the Jag was 180km/h, and I can say it behaved very well.
Fastest I ever went was 24Okm/h with a Mercedes Taxi in Italy on a small stretch of highway to the Airport in Rome (they are crazy alright), the big Merc felt paper thin…
210km/h with my motorbike, a 1978 Yamaha XS750, a bit scary,
and 200km/h with my old 1974 Fiat 124 coupe, also a bit scary !

Unfortunately 98 load index 215/65-15 tyres are not that common.
But 96 (710kgr per tyre) is adequate indeed me thinks.

Yes David, es ist ein Federal car… from Canada, my father in law bought it in 1997 and it came to me in 2006. It was a mess and destined to go to the scrapyard…

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They are as wide David but a bit shorter.
In my SIII both fit well.

Thanks for correcting my bad memory: H is definitely OK!

Tyres should be safe in any case. More of a legal question to me. Mind you I also have H‘s and wouldn’t use Vs if not absolutely needing them.
The Jag feels better at high speeds. 180 is definitely no issue - I have done 250 in an older 7 Series, 240-ish in a newer Audi and never felt scared or anything uncomfortable.
150 in an older A Class is another story, that is when you feel
Don’t know about motorcycles, did 80+ in a two-stroke and my friend declutched out of fear that the Motor would seize or overheat without
The load index should also be just fine, that might give you sidewall stiffness but I can’t see why that should be so important, anyways.

I chose “T” rated touring tires a few years ago for my SIII. Well within any peed I was or wouod drive at.

Add on, the limits are “at extended periods”. So 125 for more than an hour is risky!!

Then more PSI’s for tour at “high” speed. Yes, the Jaguar handbook speaks to that.

I am with Doug. stiffer sidewalls, less flex, = less heat or cord vs rubber parting.

And, indeed, from time to time we see complete treads on the road. Tossed at speed.

The big USA sedans in the fabled Mexican Road race of the 50’s were limited to "off the shelf{ bias tires of the time. Extended periods of 100 MPH + in very hot weather. The tams dealt with that by more PSI’s and new rubber at pit stops.

The 215’s on Kent wheels stand about an inch proud in my spare well. The same size on the Lattice XJS sourced wheels, just much too proud. I kept the best of the tires n a Kent for the spare well

Going to market a it later. I doubt that my tires on whichever car I choose will get a speed test…

Pete:

Circa 81, my son and a pal bought new Suzuki 1100’s. Said to be the fastest road bikes of the time. And, the last of the classic bijke look, not the Star War machines that came the next year… And, after the Suzuki tech messed it up, he rebuilt it. Bigger bore, hotter cams, and a four into one pipe. Even faster. His Mom and I were glad to see it go!!! Sold to a CHP motorcycle officer. He was impressed with it’s power and speed.

Carl