
Originally Posted by
shootingstar
What I was warned just this weekend because I wanted to buy a slightly different (and tougher) tire for my front wheel, I was told by the bike mechanic, that never to install a back tire that is skinnier/narrower than the front.
I suspect it has to do with weight-bearing issues,
It's more to do with handling. Think about what happens when your bike leans, and it's easy to picture.
Motorcycle tires don't always play well together. I'd have to think it would make less of a difference with bici tires - although I will say that the profile of my Conti GP4000s is very different from the profile of the Michelin Lithions I ran before them. I've never ridden Vittorias so can't help you there. I wouldn't race on a mismatched set, but you should be fine if you're not demanding every bit of grip from the tires.
Speed comes from what you put behind you. - Judi Ketteler