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The Ultegra Hollow Tech II Crankset features an optimized lightweight design that doesnt sacrifice stiffness
Axle shaft and axle ends are machined from 7075 aluminum and hard anodized
Color Black/Blue Bottle Type Standard Access Style Top Weight 34 Mount Type Bolt-On Material Composite Defined Color Black
}SRAM Red 22 Complete Flat Mount Caliper Assembly 18mm Front/Rear
Wolf Tooth Headset Upper Knock Block - 28.6 8mm Black Model=Bubba Rear Hub The Ultegra Hollow Tech IIWolf 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
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