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Old 11-06-2011, 02:41 PM   #1
ford man xf
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Default Spare wheel smaller wheels on car

Last night I was talking to a few people and the discussion turned to spare wheels, two of the people mentioned that the overall size (height) of there spare wheel is actually smaller than the wheels they currently have on the car, and one of these cars is brand new from the factory, if you got a flat and put this smaller spare wheel on your car, what would the implications be, even if you only drove it to get home or to the nearest garage, can any damage be done, and would having an LSD make the matter even worse?

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Old 11-06-2011, 02:54 PM   #2
galaxy xr8
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Default Re: Spare wheel smaller wheels on car

They are called a "space saver" and alot of manufacturer's use them these day's, I personally do not like them and if I was buying an new vehicle I would option a "Full size spare" if available or if not source another rim from a wrecker's or such and replace the "space saver".
I believe that you are also speed limited when using the "space saver" ?.
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Old 11-06-2011, 03:32 PM   #3
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Default Re: Spare wheel smaller wheels on car

I have the factory 19" wheels on my G6E and the factory space saver 17"

The space saver is 2" taller than the 19's it has a much larger rolling diameter

I think it's stupid jap cars that have a baby spare so your car drags on the road with it fitted

That said cos my factory spare is so tall, does that mean I can legally for say 22's?
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Old 11-06-2011, 03:41 PM   #4
03 GHIA
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Default Re: Spare wheel smaller wheels on car

Uneven tyre diametres will wear an LSD, but over relatively short distances it will have near to no effect at all.
The only other problem would be brake balance would be off under hard breaking, which is why all non-standard spares are limited to 80 now.
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Old 11-06-2011, 05:48 PM   #5
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Default Re: Spare wheel smaller wheels on car

Running a smaller diamiter rim and tyre will chew out the clutches in an LSD type diff due to the clutches having to take up the difference in the traveled distance between the wheels (if that makes sense). So if you have a smaller size spare put it on the front of the car and run the same size wheel on the rear not really a big deal just a bit more work when you get a flat.
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Old 12-06-2011, 10:12 AM   #6
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Default Re: Spare wheel smaller wheels on car

This came up a number of years ago in the UK where a Volvo driver replaced the flat with a factory "space saver" and drove home.
The difference in the wheel sizes was enough to cause the centre diff to be damaged to the extent it needed replacing.
After some legal hassles Volvo finally replaced it under warranty.

Peter.
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