GRX FC-RX610-1 crank set 38T (1x12S) 165mm ＊ 1x12 speed crank set for the Gravel/Adventure Compo [GRX] series. Provides optimal gearing for riding on various terrains. Front single use, rear compatible with 12 speeds. ※The bottom bracket is sold separately. FC-RX610-1 38T Specification Dimensions: 38T Crank Length: 165, 170, 172.5, 175 mm Compatible Chain: HG 12 Speed PCD: 110mm Chain Line: 49.7mm Q Factor: 151mm 2 (24mm) ＊ Recommended BB：BB-RS501, BB-RS500-PB ＊ Compatible BBCiel Width: 68mm, 70mm ＊ Reference Weight: 791g
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