Uberbike SRAM DUB BB-PF30 Compatible Press Fit Bottom Bracket is designed for use with PF30 frames (46mm cup size) with SRAM DUB chainsets featuring a 28.99 spindle diameter. Chainsets with 30mm spindle diameter will not be compatible with the Uberbike DUB bottom bracket. The carbon steel sealed bearings housed in alloy cups for maximum bearing support and strength, with a nylon center tube to reduce weight. The bearings seals feature both rubber and alloy, providing double protection for the bearing. Weight 122g.