Originally Posted by
Longfemur
What do you mean a spare? Why would you need a spare tire?
Ever cut a tire beyond repair even though it's mate was only a few hundred miles old? That's what a spare is for.
Originally Posted by
Longfemur
I know some people do it, but I have never and will never put tires of different sizes on my bike. I think it affects how it handles in turns and it makes it unpredictable.
I've never uses mismatched sizes either but I expect that a small size differential would have no noticable effect unless you are racing a crit or decending from the Alps. I've heard of riders intentionally using a smaller front tire than the rear since the weight distribution is tail-heavy on all bikes.