<b>Specification:</b><br><b>Material:</b>Aviation Aluminum,3D Forged Process;<br><b>Surface:</b>High Quality Surface Anodizing; <br><b>Crank Length:</b> 170mm;<br><b>Diamter of Alxe:</b>24mm; <br><b>Chain Ring BCD:</b>104mm;<br><b>BB of Frame:</b> BC1.37*24T-68/73mm Screw BB or Press BB92 ;<br><b>Compatible with:</b><br> 1.1x,2x,3x speed Chainring;<br> 2.Shimano,Sram(need 24mm to 22mm Conversion kit)，FSA, Gaint ATX770 ATX770-D XTC 750;<br><b>Weight:</b><br>one pair crank arm:682g;<br>Bottom Bracket:100g;<br>