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Rotation protection: The optimally designed turbine discs enable the helmet to move slightly on the head upon impact
Air-Form - Air-form is 30% more shock absorbent
- Eliminates creaking and noise associated with traditional press-fit BBs
Whether it's beating hand fatigue on the third lap of a four-lap race or just taking the edge off your favorite rocky trail
- Mult-zone tread pattern
Wolf Tooth Premium IS Upper Headset for Trek Knock Block Color:Red Rotation protection: The optimally designedWolf Tooth Premium Headsets for Trek Knock Block are machined in the USA out of aircraft grade 6061 aluminum with superior sealing for protection against the elements. Available in a variety of colors to match the style of your bike. These upper headsets are for Trek frames with molded in internal bearing cups. Note: These headsets are to be used only with Trek Knock Block system Trek developed Knock Block as an integrated frame protection system to