Wolf Tooth designed the Drop-Stop chainring to be optimized with single ring drivetrains. The clever tooth profile manages to hug the chain and prevent chain drop, while at the same time allow the chain to roll smoothly around the ring, void of any excess friction. Perfectly compatible with 9-11 speed drivetrains, as well as 3/32 inch fixed gear or single speed configs. Complete 7075 alloy construction has been anodized for added durability with light laser etched graphics. You will need to choose the correct BCD to match your crankset. Chainring bolts are not included.