I've got a thread going in the wheels section
but it doesn't seem to get much traffic. So I thought I'd broaden the topic and post it here.
How much mixing and matching can you do with wheels? And how close do they need to be to avoid problems? I have 4 matching wheels, but my spare is different - I can find wheels that are very nearly the same but want to make sure I'm not going to cause problems. If worst comes to worst, is it ok to use a spare with different backspacing and width to get out of a trail?