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The SLX FC-M7100-1 crank features an entirely new construction, using direct mount chainrings, special gear tooth profile for improved chain retention, and a 170mm / 175mm Q-factor.
Specfication:
Brand: Shimano
Superior chain retention
Special MTB gear teeth profile improves chain engagement and retention
DYNAMIC CHAIN ENGAGEMENT+
Rigid and lightweight design boosts trail-riding enjoyment
Hollow forged crank maximizes power transfer while limiting weight
HOLLOWTECH II
Easier gearing than racing groupsets
Q-factor: 170 mm / 175mm 
Chainline: 52 mm
 
***These are OEM Shimano Parts, Brand new, Never Installed on Bike, Never used in any way, just NOT in retail packaging.***