Wolf Tooth Headset Spacer Knock Block - 10mm Black

Wolf Tooth Headset Spacer Knock Block - 10mm Black. Wolf Tooth Headset Spacers for Trek Knock Block are machined in the USA out of aircraft grade aluminum.

Compatible with Trek Knock Block system

These spacers have unique raised features that key to Knock Block compatible stems (made by Bontrager)

1 1/8" top (straight 1 1/8" or 1 1/8" to 1 1/2" taper) steerer tubes only