Designed specifically for oval chainrings, keeping your chain secure at every single crank position. Also works with round rings \n Features a unique adjustable chainline from 4853mm making it compatible with standard and Boost setups \n Fits 2634T oval or 2836T round chainrings \n Backplate is 7075 aluminum, cage is GF + PA66 polymer composite, bolts are titanium T25 \n ISCG05BSA model uses only one bolt of the ISCG mount and is held in place with the BSA threaded bottom bracket