Bicycle Cranks

APM Bicycle  Narrow wide tooth Cranks takes statistics hardness, electrical conductivity and crystal as standard to reinforce the strength on integrated forging 7050 crank arm and imported European aluminum 7075 100% CNC chain rings for highest performance, with 6 points index shifting up design of the chain rings will provide faster, smoother and precisely shifting transfer of your bike and make your take the lead. Unique design of lower pressure angle that reduces the load of chain rings, makes the transmission better, increases the chain’s life and enlarges the width of the bottom curve for adapting changes of different chain distance and increasing 15% transmission efficiency.