rank Arm length: 165/167.5/170/172.5/175/177.5mm, 7075AL.
Chainring: 56 or 60T single, 7075AL.
Spider: 5-arm BCD 130mm, 7075AL.
Chainring bolt: KCNC Allen bolts 7075AL.
Q-Factor: 153mm
Bearing: Full stainless steel, better anti-rusting&durability.
High precision full CNC machined single chainring.
