The SRAM Eagle S100 Crank assembly provides confidence with a robust aluminum crankset. A 3-bolt interface ensures compatibility with SRAM Eagle X-Sync 2 chainrings (sold separately).Aluminum crank arms3-bolt interface ensures compatibility with SRAM Eagle X-Sync 2 chainrings (chainrings sold separately)Requires 118/73 Powerspline Bottom Brackets (sold separately) 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;} Number of Chainrings No Rings Included Chainring BCD Direct Mount SRAM 3-Bolt Chainline/Hub Compatibility 141/148 Boost Hubs Color Black Crank Length (mm) 160 Crank Intended Use Mountain BB Included No Pedal Spindle 9/16" Spindle Interface Type TruVativ Power Spline Defined Color Black