Precision machined threaded aluminum cups with outboard bearings. Fits T47 specific frames (47mm ID) with shell widths ranging from 68mm to 100mm. Includes anodized aluminum cups with Enduro sealed bearings. Sleeve between the cups is included for added dirt and grime protection, also helps keep internal wires away from the crank spindle. Crank spindle diameter options: 24mm (Shimano), 24/22mm (SRAM), 30mm and SRAM DUB. Angular contact: Enduro ABEC 5 angular contact bearings. Base: Enduro ABEC 3 sealed bearings