New Shimano 12-Speed MTB Components Deliver More Versatility and More Options for Mountain Bikers

Say hello to reduced drivetrain wear and tear. Thanks to new LINKGLIDE technology, you can enjoy high-mileage, low-maintenance cycling for years to come – with less worry about having to replace or repair drivetrain components.

OSAKA, Japan (March 25, 2021) – Adding versatility to its robust lineup of 12-speed mountain bike components, Shimano announces new crankset and derailleur options to suit a wider range of mountain bikers. Two new cranks - including an XTR option - feature 55mm chainlines, providing riders with more clearance for modern bike designs that include wider chainstays. Additionally, Shimano announces the new XT short cage rear derailleur that offers more ground clearance for aggressive riding while maintaining Shimano’s hallmark fast, smooth, and reliable shifting. 


Shimano XTR FC-M9125-1 cranks with 55mm chainline


New Shimano 12-Speed Cranksets

To accommodate new mountain bike frame designs and more extreme riding conditions, Shimano offers two new cranksets (FC-M9125-1 and FC-M512-1) with a 55 mm chainline. This new 55 mm chainline sits between Shimano’s FC-M9100 (52 mm) and FC-M9130 (56.5 mm) cranksets, delivering more chainline options for a diverse range of mountain bike designs. 


Both are designed for use with 148 mm wide O.L.D. rear wheel hubs and come with direct mount chainrings for easy installation and Shimano’s DYNAMIC CHAIN ENGAGEMENT+ for superior chain engagement and retention over rough ground.



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, and175 mm

-       Available chainring options: 30T or 32T

Shimano XTR cranks with 55mm Chainline



Shimano Deore cranks with 55 chainline



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


Shimano Deore XT short cage rear derailleur




Shimano’s new XT derailleur still offers all the technologies and benefits of Shimano’s 12-speed rear derailleur platforms such as fast and precise shifting performance, bigger 13T pulley wheel, and stable drivetrain in rough terrain. 


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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