Designed specifically for oval chainrings, keeping your chain secure at every single crank position. Also works with round rings- Features a unique adjustable chainline from 48-53mm making it compatible with standard and Boost setups- Fits 26-34T oval or 28-36T round chainrings- Backplate is 7075 aluminum, cage is GF + PA66 polymer composite, bolts are titanium T25- ISCG05-BSA model uses only one bolt of the ISCG mount and is held in place with the BSA threaded bottom bracket