Bicycle Crank Set Aluminum Alloy Durable Sprockets Mountain Bike Accessories. MTB Crankset 130BCD Mountain Bike Square Hole 42T 52T Sprockets 170mm Bicycle Crank Set Bike Accessories Bike Parts.Material: aluminum alloy for crank, 52 T chainring : Aluminum Alloy or High Carbon steel to choose, 42T chainring :High carbon Steel. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Cranksets". The seller is "11_colors" and is located in this country: CN. This item can be shipped worldwide.