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Unread 04-04-2016, 12:39 PM   #1
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Default Different size on spare tyre

Hello,

I have just bought a car and I have realised the size of the tyre on the spare wheel is different than the 4 tyres that are on the car at the moment.
On the car it's 185/65R15 88H
and on the spare wheel 185/60R15 88U

will it be a big problem to drive my car if I get a flat tyre and I need to use the spare wheel?
is the difference a big issue?
If that does happen I would probably use the spare wheel until I buy a new tyre in which case I would buy the right size.

Thanks.
Al

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Unread 04-04-2016, 02:58 PM   #2
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No, it's not a problem to use the spare wheel. Why else would it be there? As long as you're using it for a short trip to go get a replacement, there's no issue.

The second number, 65 on your regular and 60 on the spare, is the height of the sidewall. So your spare tire isn't quite as tall as your regular tire.

If you can, put the spare on where it isn't driven -- i.e. front on a RWD car, rear on a FWD car. If it's on a driven wheel, your diff has to work a little bit harder to make up for the difference in tire size. Not really a big issue if you're just going a couple miles to get a new tire, but just thought I'd note that.
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Unread 04-05-2016, 08:16 AM   #3
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As long as the spare is used as a spare - that is, for a short trip to the tyre shop - it will do.

I'd opt to use the spare on the front, irregardless of the drivetrain. The wear on the differential for a single trip on the road is going to be negligable at the most.

On the rear, you risk making the car statically unstable, essentially with an intristic tendency to oversteer.

Oversteer means that as you increase speed into a bend, you need less steering (for a steady-state condition) to a point where you ultimately need no steering and eventually need to countersteer as we all know.

If at a particular speed you needn't have any steering applied in order to corner, than if you reach that speed even in a straight line, the car would make a corner and spin suddenly. It ain't preety when it happens.

Last edited by Drivemaster; 04-05-2016 at 08:49 AM.

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