Check the listing for details. Shimano Deore SM-BB52 68/73mm BSA Hollowtech Bottom Bracket SM BB52 MTB. Condition: New. Listed at 16.99 USD. Specifications: Application: Cross Country, City & Touring, Freeride, DownhillType: BSAShell Width: 68/73 mm, 83 mmAxle Diameter: 24 mm (Hollowtech II) Technical Information: Bearings: steelBottom Bracket Cup Material: aluminiumBottom Bracket Shell Material: resin Features: - bearing cups painted- high power transfer efficiency- improved seals, smooth running- recommended for ZEE FC-M640, FC-M645 / Deore FC-M591, FC-T611, FC-M610, FC-M612, FC-M615, FC-M617, FC-M6000 / Alivio FC-M4050, FC-M4060, FC-T4060 / FC-M552-L, FC-M552-S, FC-M622, FC-M625, FC-M627, FC-MT500, FC-MT200 / FC-T551-S, FC-T551-L Technology: Hollowtech IIThe outboard bearings offer better weight distribution and more stability that provides a more efficient power transfer. The diameter of the bearing axle (24 mm) was an important factor in development because the axle has a positive effect on stiffness, stability, weight, and rotating efficiency. ***US Seller*** Delivery From US Shipping Policy: From United States TX Warehouse - Free Shipping Delivery (USPS): 2-4 Working Days. Return Policy: -Item for exchange or refund can be returned within 60 days -For any exchange or refund, the item must be in its original condition. -Please contact us first for refund or exchange the item.