How to choose your MTB headset?

How to choose your MTB headset?

Visit MTB headset ensures reliable, precise steering of your bike. It also takes all the strain from the front wheel, which is why it inevitably tires and needs to be serviced and replaced with some regularity. Here are a few explanations to help you.

Standard wheels

  • Type of headset: external, semi-integrated, integrated
  • Frame insertion diameter
  • Fork mounting diameter
  • S.H.I.S dimensions

Headset types

Given the different standards of MTB frame headset bushes and fork steerer tubes, it's not uncommon to make a mistake when you're not familiar with the subject. However, it's relatively simple to identify the model you need, thanks to the following three pieces of information:

Firstly, the frame insertion diameter. This is the internal diameter in the bare frame at the entrance to the steering bushing a. The value may be different for the upper part a1 and lower a2 so both must be measured for a complete headset.

Secondly, the mounting diameter on the mountain bike fork. This corresponds to the diameter of your fork steererb. The value may be different for the upper part b1 and lower b2 of the pivot, so both must be measured for a complete headset.

Thirdly, the type of mounting. If the bearing is housed in a cup that protrudes from the frame: there's no doubt it's a external (or EC). If the bearing is still in a cup but embedded in the frame, it is a semi-integrated (or ZS). In the last case, where the bearing is placed directly in the frame without a cup, it is a integrated (or IS). The type may be different for the top and bottom parts, so it's important to identify both for a complete headset.

Finally, you'll often hear about SHIS (Standardized Headset Identification System); this is simply the name of the standardization, a synthesis of what we've just seen together. SHIS is always composed of: 2 letters for the type, a first value for insertion into the frame, and a second value for the fork pivot.

For example, a headset whose SHIS is EC34/28.6 will be an external-type headset, with a frame insertion of 34 mm and a fork steerer tube diameter of 28.6 mm (1"1/8).

Which headset to choose?

As you've probably gathered by now, your choice will be determined by your frame bushing and fork steerer tube (SHIS).

You'll be able to choose the headset material and bearing type. For the latter, you'll find either ball-cage systems that last over time, provided you maintain them regularly, or sealed bearings requiring less maintenance.

Reminder If your frame is designed for a 1.5" fork or a tapered fork, there are headset kits available for a conventional 1"1/8 steerer fork.

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