Offered : new in box, Race Face Turbine Mountain Bike Crankset 175mm x 30mm Spindle Cinch Black arms. Crankset was never mounted, and includes the original box (as pictured). ** This is their standard crankset , to be used on XC /trail bikes , with a traditional 73mm bottom bracket frame shell. A single ring cinch ring can be installed easily, but if you want to do a 2x drivetrain, then you'll need to buy a Cinch spider that can do 2 chainring or a three position spider for bash guard plus two chainrings. You'll also need a proper 30mm bottom bracket (made by Race Face / King, etc) , to be used with this crankset. Be sure to investigate which bottom bracket to buy, given the frame type you have ( BB shell ). Product Details: Axle Material: 7050 Aluminum Crank Arm Material: 7050 Aluminum Includes: crank arms only (Chain Rings & Bottom Brackets sold separately) Material: 7050 Aluminum Crank Arm length : 175mm Spindle Diameter (MM): 30 Chainline: 52mm - 136 Spindle Weight Conditions: 136mm Spindle (30mm XC-Enduro Cranks) Weight: 595g