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Author Topic: Jag tyre/technical question  (Read 2311 times)
BikerGran
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« on: September 18, 2017, 10:21:49 AM »

Mike has a problem with tyres for his Jag.  Ordinary tyre companies don't make the right tyres for his model any more, he can get from a vintage tyre supplier but nearly £400 each!  So he bought some used ones but our local tyre fitter said the one Mike showed him had tiny cracks in and might fail the MOT, so he's looking a fitting a different size tyre to his wheels.

He asked the Jag Heritage people this question, they couldn't answer and forwarded it to Jaguar themselves, but they say they can't answer as it would be a non-standard fitting, so I thought, someone on MMM is bound to know!  This was what he asked.....

Quote
Tyre change.I have a 1993 xj40 and wish to fit tyre size 225 60 15w as original spec tyres no longer available. I know this will make a small percentage loss on speedo but wish to know if there will be any damage to gearbox.

It's an auto box of course.

The original size is 225 65 15w.
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toad
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« Reply #1 on: September 18, 2017, 05:48:31 PM »

Bobbi The new tyre size won't affect the car at all. A lot of jags of that era are running 215's with no problem they are just 10mm narrower. Wink
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Olds
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« Reply #2 on: September 18, 2017, 06:00:51 PM »

Jaguar won't want to answer as any problems regarding speedo error etc would come back to them in a legal dispute.
There are size comparison sites on the web and as long as the difference in circumference is small then there will be no issues with the gearbox or speedo.
 215/70 x 15 is only 0.7 percent different to a 225/65 x 15
 225/60 x 15 is 3.5 percent smaller than a 225/65 x 15
Go for the 215/70 if possible
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Archie
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« Reply #3 on: September 18, 2017, 06:44:03 PM »

Problem with 215/70 is it's a commercial size, so may struggle to get a non van tyre in that size
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BikerGran
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« Reply #4 on: September 18, 2017, 08:48:37 PM »

Cheers all, will relay the info to Mike!
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