25' Koozer 550 heavy-duty MTB hubs,for AM/FR/DH/E-bike,F 20x110 R12x148/12x150/12x157mm Super Boost , with a larger hub body diameter, integrated one-piece CR-Mo steel axle, and extra-wide pawls, oversized bearing design,And three anti-bite steel bar are implanted on the cassette body,all designed for higher strength. It allows you to easily handle any complex and difficult road conditions. Please pay special attention to the hub specifications BOOST in this link：20x110 and 20x110 boost, they have the same axle width, but the FIT of the boost version will be 10 mm wider, and then the distance from the endcap outside to the brake surface, the boost is 5mm less than the non-boost version, this is very important important important , please confirm clearly before buying. Koozer 550 High-strength One-piece Cr-Mo Steel Axle Hubs for Heavy-duty MTB Bicycle AM FR DH E-bike 12x148/12x150/12x157 super Boost HG 8-12S 32H > Material: Body: AL6061 Axle: 30 CR-MO Endcap: AL7075 Cassette body: AL7075+steel > Spoke holes: 32 > Gauge: 14 > Sealed bearings: 4 pcs for HG version(6903*2+17287*2)/ 5 pcs for HG version(6903*2+17287*1+6803*2) > Axle&Built-in size: 12x148 boost/12x150mm /12x157 super boost > Brake interface: Disc IS (6-bolt) > Cassette body: 4 pawls/40 clicks, HG/XD/MS, MTB 8-12S > Weight: 418g(12x148)/430g(12x150)/438g(12x157) > Colour: black > Warranty period: 2 years Important note: for the explanation of common abbreviations, please check the specifications you need before buying. If you are not sure how to choose, please consult our professional salespersons, and we will give you accurate suggestions. We are not responsible for the losses caused by your own purchase mistakes. 28H/32H/36H = the hub has 28 spoke holes/32 spoke holes/36 spoke holes, can fit your 28/32/36 holes rim. QR = quick release version = front 5x100/rear 5x135mm = front 9x100/rear 10x135mm QR TA = through axle version = THR = front 15x110/20x110/rear 12x150mm Boost = front 15x110mm or 20x110mm / rear 12x148/12x157mm HG/XD/MS = the hub's cassette body is compatible with Shimano MTB 8-11 speed cassette and Sram PG series 8-12 speed cassette( HG ) / Sram MTB XG series cassette 11&12 speed( XD ) / Shimano MTB micro spline 12 speed cassette( MS ).

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