Some Vauxhalls, including Omega, Carlton and Cavalier were sold with different sized spare wheels because the spare wheel wasn't big enough to accomodate ever increasing wheel/tyre sizes - their Opel equivalent had no problem because a space saver was fitted but the Vauxhall version had to make do with a smaller normal road wheel/tyre.
It wouldn't have been legal to use it as a spare - but I routinely have a different size spare because I often upgrade the tyres at replacement and I would have no conscience about using it in emergency.
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