Gents,

Ended up getting a single used tire after a tire blowout.

The used tire looks pretty good shape with good treads. Question is can I keep it on the axle? Just looking up specs, it looks like the used tire is about 0.2inches in diameter shorter than the other one on the axle. This is the rear axle.

Will 0.2inches cause issues with the differential? This difference in height would stay during all driving conditions obviously, not just turning. Does Jaguar have a max allowable tire diameter differential that anyone knows of?

Note: The used tire is in spec for the Jaguar wheels, similar to all the other tires on the car. I thought I had gotten the same model as the others. But it seems like it’s a variant of the same model, so this small difference is there.

 

Always helps to post what car you have? year, model, Engine and RWD or AWD? Lot's of variations and I would get the odd tire replaced with one that matches the other tires.
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and it's too bad that you aren't able to let us know what brand & model the tires you're comparing are.
With the vague info you're providing, the best answer would be - maybe, maybe not.
And if one tire of a set blew out, there's no reason (from the details you've provided) not to expect each of the remaining 3 to blow out soon too, assuming they were all fitted together & have the same number of years & miles on them.

 

Whoops. Thought car info was in signature.

2016 Jaguar XJ R-Sport V6 Superchargered AWD (RWD in sport mode)

Existing Tires: Pirelli P Zero Nero
Single Used Tire (Rear axle): Pirelli P Zero

 

What are the sizes? The tires are the same brand but a different model so hard to say.
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C = π*d. A tire that is 20" in diameter rotates 1,009 times to drive 1 mile. A tire that is 20.2" in diameter rotates 999 times to cover the same distance. So a difference of 10 rotations over one mile. Over the life of the average tire that's about 300K rotations MORE on one side than the other. I don't see that being very healthy for the rear diff clutch plates or the center differential.

 

These are 20 inch rims. And I believe this car has an open rear differential, which should help with flexibility in tire difference.

right side tire: 27.7” overall diameter
left side tire: 27.5” overall diameter

I believe that ends up being a 5rev/mile difference no? What do yall think?

 

There is a specification for your car in the JLR Topix information.
All wheel drive, all four tires must be within a specific tread depth.
2 Wheel drive on a drive axle must also be within a specific tread depth of matched tires.
On my all-wheel-drive, I remember it as being 2/32" or 3/32" + or -
If I blow a tire, I order a used tire of the exact same brand and model with the stated specification of tread depth that matches the rest of the tires.
Even if it's the same brand but a different model, the rolling radius can be radically different even if the static radius is close to the same.

 

never mix and match tires was always something i have followed

 

Details are in your Public Profile:

 

these are the other two tires tirerack.com recommends for this car (each column is different tire). These alternates show a 0.1-0.2 size difference between the front and back tires. The OEM model however is exact same size front to back.

Does this mean front to back size difference is allowed? Even for AWD cars? That’s about a 1% diameter difference front to back.

 

Bumping this one last time 👍

 

Quit being cheap. AWD cars don't like any differences in tire diameter or spec. You are putting a very expensive clutch pack at risk by doing so.

 

I don’t think you’re understanding. See my latest comment with the screenshot from recommended tires for this vehicle. There is only ONE tire from all brands that has EXACT same front and back tire diameter.