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 Trek's 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