1) no, although some will worry that if you flat on a downhill, that "looser" tire may have a greater tendence to come off the rim. That has not been my experience, though I am thankful to not have run that experiment very often.steel515 said:If a tire fits very easily on a rim, is this unsafe? OTOH, if it is very tight, can this damage the bead/sidewall/tire? Also, I have an old clincher (vredestein) where the bead is flaking off. Is this unsafe.