NARROW WIDE TOOTH: The 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.
BCD: 104mm, TEETH SIZE: 38T, Chain Size: Standard 1/2" X 1/8", SHAPED: Round.
Light Weight: 85g(38T), Outer diameter: 38T/16cm. Fit for various kinds of bike crank which BCD is 104mm.
Material: 7075 aluminum T651 heating treatment. Light weight but also high strength.
CNC PRECISION PROCESS: precision machining and anodic oxidation electroplating, keep medals smooth surface, bright color, not faded and corrosion resistance. Stiff 4mm plate thickness to ensure no flexing.