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 TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Model Oval Guide Range 26-34t Oval (28-36t Round) Mount ISCG-05 Color Black Weight 22.2g Mount Type ISCG-05