Shimano Adds New Crank Width And Short Cage Rear Derailleur

Shimano has announced additions to its mountain bike crank and rear derailleur offerings. Two new cranks – including an XTR option – feature 55 mm chainlines to provide more clearance required for modern bike designs that include wider chainstays. Additionally, Shimano announced a new Deore XT short cage rear derailleur providing more ground clearance over aggressive terrain often littered with rocks, roots and logs.


To accommodate new mountain bike frame designs and proggressive riding styles, Shimano offers two new cranksets (FC-M9125-1 and FC-M512-1) with a 55 mm chainline. This new 55 mm chainline option complements Shimano’s FC-M9100 (51 mm) and FC-M9130 (56.5 mm) cranksets, delivering compatibility for a diverse range of mountain bike designs. Both are designed for use with 148 mm wide O.L.D. rear wheel hubs and feature direct mount chainring installation.

FC-M9125-1 – Shimano XTR Crank

  • –  Available crank lengths: 165mm, 170mm, and 175mm
  • –  XTR chainring options: SM-CRM95 (30, 32,34,36T)
  1. FC-512-1 – Shimano DEORE Crank
    • –  Available crank lengths: 165mm, 170mm, and175 mm
    • –  Available chainring sizes: 30T or 32T

Deore XT Rear Derailleur

Shimano’s new short cage Deore XT rear derailleur provides better ground clearance for more aggressive trail riding. It also supports faster riding and smoother rear suspension movement thanks to a reduction in unsprung weight of the drivetrain.

RD-M8100-GS – Shimano Deore XT Derailleur

– Designed for Shimano’s 10-45T, 12-speed cassette.

– 28mm shorter than RD-M8100-SGS long-cage derailleur

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