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
- 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 |