I've got a hybrid with 700 x 35 tires, and the typical hybrid tread. I am eventually going to try to go with a narrower tire but on the same rims. Is that possible? If so, how much smaller can I go? I still want stability for the occasional detour (usually induced by traffic or people walking across the length of the bike path) into dirt or stone. Could I could to say 700 x 32? How much increase in speed would I expect?
Second, how would 700 x 28 feel as far as grip (not related to same rim issue)? I am not interested in slicks or a road bike, but I do want a little less road resistance. I've heard lots of talk about the Specialized Sirrus (not available in my area), which to me seems like the perfect bike as long as it doesn't seem to "delicate" (ie semi-dangerous in stone dust, dirt, grass, etc). I have no plans to mountain bike but I do sometimes ride on stone dust or 1/4 in stone trails.