https://postimg.cc/gallery/49KLvNL/1a69290d
I would have thought it was the 720, except I think (?) these are side-pull brakes and the 720 should have caliper brakes. But the 620 and 520 would be shorter in the chainstays, right? One of you bike nerds (said lovingly) probably knows offhand.
by olderthanmycars