SHIMANO FC-M523 10 Speed MTB Bike Crank Arms Set 170/175 MM Modification 96BCD | eBay
Bikesmith - MODEL NO FC-M523 SERIES SHIMANO Color Black, Silver Bike Type MTB Axle length of BB-UN/ ES (mm)_Threaded (normal) 118 Arm adapter ✓ Chain line (mm) 50 Chain ring combination 40