Check the listing for details. Sealed Bearing Thread Type 68 -73mm BSA68 BB91 Shell 24mm. Color: Black, Condition: New. Listed at 15.75 USD. Sealed Bearing Thread Type 68 -73mm BSA68 BB91 Shell 24mm Model: Model: BB-51 Weight: 106 g Suitable for 68 mm or 73 mm five-way, consists of three 2.5 mm shims 68MM (road bike bottom bracket) add a washer on the right 68MM (mountain bike bottom bracket) add two washers on the right and add one on the left 73MM (mountain bike bottom bracket) with a washer on the right The bearing bores are 24mm inner diameter for both sides. The bearings are lined with polymer bushings to prevent noise and wear. The inner sleeve is o-ring sealed to keep water out. The bearings are pre-filled with grease. This is a solid and legit BB. Free shipping in the USA! Check out our other items,Including our HubDoctor® Mavic® Freehubs Rebuild Kits The cost-saving solution for rebuilding Mavic® cassette hubs.