Re: Are 16.5\'s really that bad?
The main difference with the 16.5" rims, versus other sizes, is that they do not have an inner lip to help retain the bead. If you look at a 15" rim for example, they have a small lip about 1" in from the outer edge, and this small lip definitely helps hold the tire on the rim. 16.5's on the other hand do not have this, plus the bead seat is at more of an angle and both of these conditions can result in it being easier to lose the bead on the tire. Of course, this really isn't much of an issue unless you air down though I have seen a 16.5" tire lose a bead at 20 psi and the trail.