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Old 17-09-2018
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Default How sensitive to diameter differences is the WH?

So...

If I was to have a spare which has a 1mm rolling diameter difference to the other 4 (0.1% difference in circumference), would the car have a fit if it was fitted on one corner in the event of a flat?

I would theorise no, because that's less of a difference than a new vs 50,000 km tyre would be. But, it is a Jeep!

Rob.

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Old 17-09-2018
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Originally Posted by robertodonnell View Post
So...

If I was to have a spare which has a 1mm rolling diameter difference to the other 4 (0.1% difference in circumference), would the car have a fit if it was fitted on one corner in the event of a flat?

I would theorise no, because that's less of a difference than a new vs 50,000 km tyre would be. But, it is a Jeep!

Rob.
1mm difference would be fine.
I've ended-up with a brand new spare mud tyre while my other four are ~50% worn, waiting until I replace the others before including it in rotations.
But still needed to use it a couple of times. So I just dropped the pressure a bit to get the rolling diameter close. Only judged by eye, so there'd be some difference. The Jeep didn't seem to mind.

The wheels are almost never rolling at exactly the same speed, with road camber, bends, etc. So ABS and traction control systems look at the rate the difference between wheels changes, rather than the difference itself.
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Old 17-09-2018
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Thanks for that mate.

I have acquired a set of 265/60/18 a/t's I am fitting, and I can get a new 245/65/18 h/t for the spare for bugger all, so I think I will go for it unless I can find another a/t soon.

Rob
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Old 19-09-2018
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Thanks for that mate.

I have acquired a set of 265/60/18 a/t's I am fitting, and I can get a new 245/65/18 h/t for the spare for bugger all, so I think I will go for it unless I can find another a/t soon.

Rob
I see. Yeah no-worries doing that... aside from the annoyance of not having a matched spare obviously haha.
<1mm on paper but you'll have some difference with the tread, construction, brand, pressure, etc. So I'd just give it a quick measure/eyeball if I needed to drive on it for a while, and be careful with load rating.
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