Designed specifically for use with Brose motor systems, this chainring is the lightest, most advanced e-specific ring ever designed Steel and aluminum construction Compatible with Brose motor systems 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 Brose CL55 Ring Type T-Type Mount Brose Teeth 36 Oval/Round Round Color Black Tooth Count 36T Motor Type Brose CL55