Joined: Jul 2009
Posts: 1,637
Likes: 3
From: Boston Burbs
Bikes: Bedford, IF, Hampsten, DeSalvo, Intense Carbine 27.5, Raleigh Sports, Bianchi C.u.S.S, Soma DC Disc, Bill Boston Tandem
Looks like you could dimple the chainstays to gain some clearance.
What's the difference between 650a and 650b? I could search, but I am lazy...