QR = quick release version = front 5x100 / rear 5x135mm = front 9x100 / rear 10x135mm QR. 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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