How to Install a 1 1/8" Threaded Fork (Step-by-Step)

🔧 Installing & Cutting a 1 1/8” Threaded Suspension Fork | Trek 820 Rebuild The original suspension fork on my 2012 Trek 820 didn’t work and honestly looked terrible. Instead of spending money on a new fork, I dug through my parts bins and found a nearly new 1 1/8” threaded suspension fork. There was just one problem… it was too long. In this video, I show step-by-step how to: 👉Remove a threadless fork and headset 👉Test fit a threaded fork 👉Properly measure and cut a threaded steerer tube 👉Clean and reform threads after cutting 👉Install headset cups and bearings 👉Adjust a threaded headset correctly If you’ve ever wondered about 1 inch vs 1 1/8 threaded forks, how much steerer length you really need, or how tight a threaded headset should be — this video walks through it clearly. This is part of my abandoned Trek 820 rebuild series, where I’m rebuilding a “$400 repair quote” bike using mostly used parts from the shop and parts-bin finds. Next up: converting this to a modern cockpit with a stem converter and high-rise handlebars. If you’re into budget MTB rebuilds, vintage upgrades, or learning real-world bike mechanic skills — subscribe and follow along. ⏱️ Timestamps 0:00 – Why I’m Replacing the Fork 0:48 – 1” vs 1 1/8” Threaded Fork (Critical Fit Check) 1:04 – Measuring & Cutting the Threaded Steerer Tube 2:03 – Cleaning Threads & Installing Headset Cups 2:37 – Adjusting the Threaded Headset Correctly ************************************************************************* I only recommend items I actually OWN and use. The links above may provide a small advertising commission at no added cost to you.