Basso Carbon Road Bike Rim Brake Frameset 52cm. In great condition, just some light marks and scratches. QR Hubs. Clamp on front mech, 35mm. Rim brake. External cables. Screw in BB. 31.6mm seat tube. Double waterbottle cage mounts. 15cm head tube. 53cm seat tube, measured center bb to top of the seat tube. 52cm top tube, measured center head tube to center seat tube along the top tube. Weighs 1650 grams.