Allows up to 12 degrees of 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 Ochain R is externally adjustable between 4, 6, 9, and 12 deg of rotation, helping the rider optimize the balance of spider rotation and pedaling efficiency New Easy system adjuster Re-engineered impact, longevity, 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 R B1 Configuration 1x Direct Mount 8-Bolt BCD 4x104mm Color Black