Out of necessity, I had to put an 1.26" (32mm) rear tyre on my bike where the front tyre is only 1.1" (28mm) wide (and the bike came with 1.1" tyres when I bought it). Are there any advantages or disadvantages of this, shall I try to get an 1.1" tyre for the rear wheel ASAP or is it safe this way?
Should be perfectly safe. I actually did a similar thing on my road bike to allow a little more cushion in the rear, for my rear. The only hassle I can see is if you have to carry two different tubes. Can't remember off the top of my head if you can get some that span those two sizes.
Riding with a larger tire in the front provides certain advantages. I do this for two reasons:
- Less slipping and sliding in the snow: With a bigger tire in the front you get more friction with the ground. This is important because your front tire is a lot more likley to flip you over then your rear because your rear tire has more weight on it.
- Vertical cracks: The reason I keep a larger tire on now that it is warmer is to avoid falling due to vertical cracks and my tire getting stuck in them. Basically if your tire can't fit in the crack you can't get stuck in it and flip over.