Originally Posted by
Arthur Peabody
27 and 700; I mentioned my 700 tires and that 27.5 is .5 bigger than something, which would be 27.
No. "27.5" is an MTB marketing name chosen for being halfway between 26er and 29er. The bead seat diameter of a 27.5" rim is 584mm, which is actually quite a bit smaller than the 630mm bead seat diameter on 27" rims.