RIM AN (AM) 20 406x21 ACME TWILL 12K CARBON TBLS DISC 36 BKLightweight full carbon race wheel with hookless bead. Full Toray T700 carbon fiber composite with Twill 12k carbon finish. Designed for use with disc brake. 220lb rider weight limit. Race use only. Item Specifications: Size, 20in, Width OD, 28, Side, DISC, Drill, 36, ERD, 390, Wall, Dbl, Valve, PV, Model, Acme 12k Twill, Profile, 20, Tire Compatibility, Tubeless Compatible, ISO, 406, Width ID, 24, Brand, Alienation,.