Easy system adjuster allows the degrees of rotation to be changed externally Allows rotation at the spider, reducing the effects of chain growth that reach the riders feet. This results in the feel of riding chainless Reduces the negative effects of chain growth on suspension performance Re-engineered impact and contamination resistance Requires a 104 BCD chainring. Fits 32-36t chainrings Chainring and bolts not included 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 Ochain S B1 Configuration 1x Interface Bosch 3/4 55mm Chainline BCD 4x104mm Color Black