Headsets

Madone Headset Top Half Upper Headset Assembly for 2010+ Madone Bearing, Compression Ring, 15mm Top Cap Manufacturer part # IS41/28.6 Steerer outer diameter 28.6mm (1-1/8") Crown race inner diameter 30mm Cup Insertion OD Integrated Stack height 15mm Bearing type Sealed Headset type upper Unthreaded fully integrated Headset type lower Fully integrated Material Carbon

Service and replacement parts specifically for Trek Knock Block technology. Genuine replacement parts Get your bike back on the trail with the headset parts you need. - Trek proprietary headset components compatible with Trek Knock Block models - 72-degree headset fits 2021 Slash 29 - Includes crown race, bearings, top cover, frame chip & fastener - Frame chip has display tabs to connect Bosch Kiox Mount sold separately - Must be paired with Knock Block stem and Knock Block spacers - Knock Block headset spacers not included