Originally Posted by branko_76

Thanks for the replies...

BSD = Bead Seat Diameter...I've never paid much attention to this stuff, now I get it

According to Sheldon Brown

27" = 630mm BSD

700C = 622mm BSD

and you guys are saying that

650B = 584mm BSD

So this rim is smaller than 27" yet many use 650B in bikes designed for 27" wheels. So, the idea is to use larger tires for comfort with the tradeoff of needing longer reach brakes.

Am I getting this right?

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