Built For Trails That Can Get Extreme Designed for the rigours of mountain bike riding, the Shimano Steps FC-EM900 is a dedicated E-MTB crank uses Hollowtech II crank arms that same appearance as FC-MT900. Hollow Forged Crank Arms A lightweight crankset not only reduces the bike’s weight but decreases rotating mass to aid in acceleration. The challenge is to reduce the weight of the crank without reducing its strength and rigidity. Shimano’s advanced forging technology has solved the problem through the HollowTech crank. Just like high-quality frame tubing, a hollow crank arm can provide amazing strength and rigidity at a very lightweight.
