In 2021, Shimano revealed new crankset and derailleur options to accommodate a larger range of mountain bikers, bringing adaptability to its comprehensive assortment of 12-speed mountain bike components. To provide bikers more clearance for modern bike designs with wider chainstays, it has launched two new cranks – including an XTR option – that contain 55mm chainlines. Shimano also introduces the new XT short cage rear derailleur, which gives better ground clearance for aggressive riding while maintaining Shimano’s hallmark fast, smooth, and reliable shifting.

New Shimano 12-Speed Cranksets

For cycling in more extreme conditions, Shimano provides two new cranksets (FC-M9125-1 and FC-M512-1) with a 55 mm chainline to support new mountain bike frame designs. This new 55 mm chainline, which stands between Shimano’s FC-M9100 (52 mm) and FC-M9130 (56.5 mm) cranksets, provides more chainlines options for a diverse range of mountain bike designs.

They are both intended for use with 148 mm wide O.L.D. rear wheel hubs, including direct-mount chainrings for simple installation and Shimano’s DYNAMIC CHAIN ENGAGEMENT+ for greater chain engagement and retention over rough terrain.

FC-M9125-1 – Shimano XTR Crank

  • Available crank lengths: 165mm, 170mm, and 175mm
  • Chainring compatibility: SM-CRM95 (30, 32,34,36T)

FC-512-1 – Shimano DEORE-Level Crank

  • Available crank lengths: 165mm, 170mm, and 175 mm
  • Available chainring options: 30T or 32T


Thanks to the new short cage XT rear derailleur and a reduction in the total weight of the rear derailleur, cassette, and chain, it also enables faster cycling and more smooth rear suspension motion.

Shimano’s new 12-speed XT derailleur brings benefits and characteristics, including fast and accurate shifting performance, a bigger 13T pulley wheel, and a stable drivetrain.

RD-M8100-GS – Shimano XT Derailleur 

  • Designed for Shimano’s 45T 12-speed cassette
  • 28mm shorter than RD-M8100-SGS long cage derailleur

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