Trek's "Knock Block" – belated April Fool's joke? - Singletrack World Magazine May 27, 2016
Knock Block Headset Alternative (Easy & Simple)
Trek Knock Block Removal: A How To Video. - YouTube
What is the Deal with Treks Knock Block | Knock Block Debate - YouTube
Knocking Trek's Knock Block System and Blue Ridge Parkway Ride - YouTube
Anyone give me any ideas how to sit this headset??? I tried to fit a knock block adapter so I could use a shorter stem and I've had a nightmare, I managed