BCD: 104mm(Outer Circle), 64mm(Inner Circle). This chainring's BCD(bolt circle diameter) is 104mm. Before submiting the purchasement, please make sure that your crankset's BCD is 104mm,otherwise they won't fit.
Teeth: 30T. Narrow Wide Tooth Design increasing the contact area with the chain greatly, so that each of the teeth can be fully inserted into the chain, increase the grasp force, make you no longer worried about the chain dorpped, easy to pass through the bumpy road.
Crank Arm Length: 170mm, Crank related holes distance: 74mm. Design of Stiffener, durable and light weight. Suit for Mountain Bike, Road bike, Folding bike, MTB, BMX.
Parcel includes: 1 x Single speed bike crankset. 1 x mountain bike multicolor plating chainring. 4 x chainring bolts.
These crank and chainring are only suitable for single speed. Can not be used on other speed.