.top{margin-bottom:30px;}.top li{margin-left:5%;margin-right:5%;margin-top:10px;line-height:120%;list-style-position:outside;}Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black. Wolf Tooth Precision Headsets for Trek Knock Block are machined in the USA out of aircraft grade aluminum with superior sealing for protection against the elements. Available in a variety of colors to add some style to your bike. These upper headsets are for Trek frames with molded-in internal bearing cups.Designed to work with Treks Knock Block system The top cap on these headsets have unique raised features that key to Knock Block compatible stems (made by Bontrager If spacers are needed you will need to use special Knock Block compatible spacers with notch features This product is the upper headset only Lower headsets on bikes with Knock Block do not have any unique features. They are usually IS headsets which are available separately 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 ul{font-size:24px;font-weight:600;margin-left:-25px;padding-top:35px;border-top:3px solid #f0f0f0;}.desc li{list-style:none;border-bottom:4px solid #eb212e;width:142px;} TECH SPECS Bearing Type Cartridge Color Black keyword search Trek Knock Block Upper Stack Height 8 S.H.I.S. Stem Clamp Diameter 28.6 Threadless
