American Classic 420 Aero 3. 1550ish in weight. I've had these for a while now and just recently upgraded my bike. Old one was a 10 speed. New one is an 11 speed. Because my wheelset is older it had a 10 speed hub and after getting my new bike I realized I can't use my old wheels. I am devastated as these were the do everything wheels. Tri races, climbs, training, etc...My upgrade to a new bike is going to cost me a few hundred more to get a new rear 11 speed compatible AC 420 Aero 3.