Light Makes Right
Join Date: Apr 2005
Location: Green Mountain, Colorado
Bikes: Gianni Motta Criterium, Dean Hardtail
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Well, a 28 should nominally be 28mm wide. You'd have to guess on where that point is but 14mm above the rim would be a good guess. The trick of course is that not all 28mm tires are actually 28mm wide. Now that I think of it, I'm not sure ANY 28mm tire is exactly 28mm wide!
Kinda like shoes.....
edit: and oh yeah - that front would make a great test case. No difference usually between from and rear road tires (they usually aren't specific) and the bead seat diameter is always the same. If it's really close you'd want to make sure you get a rear rim that is as narrow or narrower than your test rim. Maybe put a rear skewer through it and put it in the dropout like that. It's be way to narrow, so don't try to get it all the way tight, but you should be able to generate enough friction to keep it in place for measuring purposes in the shop. You'd want to be very careful if it's a carbon frame, a bit careful with aluminum and only kinda careful with steel.
edit 2: it would help if I actually read your post!
Mount that 28 on your rear wheel and give it a try.
Last edited by GV27; 02-20-09 at 05:51 PM.