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[Andy B]

Not really as the rolling radius is the same for both.

With a low profile tyre you get more wheel and less rubber, so a 17" and 15" wheel on the same axle will have less/more rubber respectfully - thus giving the same rolling radius - if that makes sense

but they are different widths, which as johny5 says, would fail an MOT.
Still, our spare isn't as bad as a lot of these super slim pram wheel space savers you see about.   

[henryd]

Not really as the rolling radius is the same for both.

With a low profile tyre you get more wheel and less rubber, so a 17" and 15" wheel on the same axle will have less/more rubber respectfully - thus giving the same rolling radius - if that makes sense

but they are different widths, which as johny5 says, would fail an MOT.
Still, our spare isn't as bad as a lot of these super slim pram wheel space savers you see about.   

those bloody things are just downright dangerous,I had to drive a golf a while ago in the wet with one of those things on the front and it was scary

[Broomies Mate]

I contacted VOSA a while ago regarding this as I was disapointed to find Vauxhall had installed a 15" spare into my Ex Girlfriends Corsa SRi which had 17" Alloys.

VOSA explained that it is not a 'Spare' wheel, but an 'Emergency' wheel to allow you to drive directly to a local Tyre fitting centre.

Still, would be interesting to argue the toss with a bored copper on a rainy Sunday Evening when all Tyre centres are shut.