Replaces rear derailleur with chain tensioner for a simple, secure drivetrain Adjustable chainline when used in combination with a Singlespeed kit (RV-6700) Compatible with 9/10/11-speed chains, 13-17 tooth cogs Aluminum construction, 146g 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 Colab Chain Tensioner Mount Derailleur Hanger Color Black Weight 146g