Wolf Tooth Premium Headsets for Trek Knock Block are machined in the USA out of aircraft-grade 6061 aluminium with superior sealing for protection against the elements. Available in a variety of colours to match the style of your bike, these upper headsets are for Trek frames with moulded-in internal bearing cups.
These headsets are to be used only with Trek Knock Block system
Trek developed Knock Block as an integrated frame protection system to prevent self-inflicted scuffs, dents, or cracks from spinning handlebars. Knock Block consists of a special stem and stop chip on the frame. The stop chip limits the turning range of the custom keyed headset cover. The top of the headset cover has notches that lock into corresponding notches on the headset spacers which also correspond with notches in the stem for the strongest connection to the steer tube. These parts work together to prevent the crown of the fork and the handlebar controls from hitting the frame.