How to cut a steerer tube and install a star nut

How To's/Tech Tips Main Mountain Biking

I’ve received a few requests from our readers asking how to cut a steerer tube and install a star nut. Unfortunately, I haven’t been able to get this video together until now. I realized that I had an old fork that I could use for the video and I decided to go for it.

For starters, you’ll need one of these, it’s a pipe cutter. You can find them at any hardware store for about $15. To install a star nut, you’ll need a special tool that can be purchased from It normally sells for $15, but right now they are on sale for $11.98.

Make sure you watch the video and learn how to do this yourself because a shop could charge you as much as $75 to cut the steerer, install a star nut and install the fork.

RL Policar

RL Policar is an avid mountain biker and the Editor In-Chief of and Between the two sites, he's published well over 4,000 articles (and growing).

5 thoughts on “How to cut a steerer tube and install a star nut

  1. this would’ve been way funnier if a gigantic-ass caterpillar came out of the steerer tube at some point! 😉

  2. A lot of times, the pipe cutter will create a deformation “lip” on both the inside and outside of the cut area on the steerer. I always dress that lip with a file so that the stem and headset spacers slide on smoothly. It takes an extra five minutes, but is worth it.

  3. Oh, so that is how it is done. My problem was I wasn’t turning it. Used a hacksaw instead.

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