Join Date: Oct 2002
Location: Annandale, New Jersey
Bikes: 2014 Surly Steamroller, 1989 Nishiki Altron
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The Ex721 used to be the d521, the EX729 used to be the d321. Hence why have the EX729 when there is the EX823? Options and people tend to prefer certain rim profiles when compared to others. I'm generally found of a narrower prfoile rim on the back and a wider profile rim on the front.