Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black MFPN=XTR9630 Charger 2 RC2 Damper option

Charger 2 RC2 Damper option featuring independent high and low speed compression adjust

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Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black MFPN=XTR9630 Charger 2 RC2 Damper optionWolf 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