FSA helps you choose your replacement headset

Enter four measurements and out pops your replacement headset bearing

(Image credit: FSA)

Headset replacement is one of the most confusing areas of bike tech. Whereas bottom brackets and axles each come in a few possible variants, the range of options for headset bearings is vast, with every bike seeming to use something a bit different from every other bike and differences between bearings not at all obvious.

Does an Orbit 1.5E ZS replace an Orbit 1.5 ZS SC or a Big Fat Pig 1.5R replace a Big Fat Pig? (Yes, that really is a headset model name).

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Headset bearings often need replacement too, as they are subjected to a lot of stress and in the line of fire for damp and grit from the road.

Watch: How to adjust your headset

So FSA, which provides OEM headsets for a lot of bikes, has come up with an on-line tool called FSA Easy Headset (opens in new tab) to help you work out which ones will fit your frame.

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You’ll need a sliding vernier gauge to measure the internal and external diameter of the top and bottom of your headset.

These four measurements are entered into FSA’s app, which prompts you with available values then pops out available FSA headsets which will fit your frame.

Do you need a Big Fat Pig?

Do you need a Big Fat Pig?
(Image credit: FSA)

One thing you don’t get to choose though is the height of the top cap. It’s not likely to be an issue if you are running spacers below your stem, but could potentially be a problem if you’ve slammed your stem and cut down the steerer tube.

Well, you could always buy a new fork too…

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Paul started writing for Cycling Weekly in 2015, covering cycling tech, new bikes and product testing. Since then, he’s reviewed hundreds of bikes and thousands of other pieces of cycling equipment for the magazine and the Cycling Weekly website.

He’s been cycling for a lot longer than that though and his travels by bike have taken him all around Europe and to California. He’s been riding gravel since before gravel bikes existed too, riding a cyclocross bike through the Chilterns and along the South Downs.