Threaded ABEC-3 bottom bracket for Fat Bike PF41 (BB121) and 24mm spindle diameter cranksMachined cups thread together for stability, increased bearing life, and simple installation and maintenanceFrame must have a 41mm inner diameter, with a width of 121mm - If used on a shell with a 132mm width, the cups will overlap 3 threads max105-132mmBB86Shimano HTII 24mmAlloy120gBlackUPC/EAN/GTIN: 811079022752