I think I'm going to try and cut the knobs off, but I like the knobs. Is there another way? has anybody made some kind of a 'tire guard' thing, that blocks the chain from hitting the tire?
I have the kind of tire that is smooth in the middle for road efficiency, but it has knobs on the side for a bit better traction on the grass and stuff, so the knobs are useful- here is a pic:
Rear Tire