Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black CheckoutSpec= Black/Yellow Double or Triple Double Color

Double or Triple Double Color Black Drivetrain Speeds 9 Front Der/Shifter Compatibility Shimano Mountain Shifter Style Trigger

4 1 1/8" Aluminum Red

} 2010 Tora XC

Disperses moisture to prevent rust and corrosion

Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black CheckoutSpec= Black/Yellow Double or Triple Double ColorWolf 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