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Trek Trunnion Adapter

Trek Trunnion Adapter

Regular price £17.99
Regular price Sale price £17.99
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Got a Trek with a Trunnion mount shock, like a Deluxe Thrushaft, and wanting to fit a different shock? 

This is a great solution for you! 

These adapters fit into a 15.08mm (19/32") eyelet, as found on most modern shocks, with M10 threads in either end, so you can use your existing Trunnion bolts. This saves you having to buy a new bolt kit from Trek, as well as mounting hardware. 

The adapter consists of:

  • 1x Stainless steel shaft
  • 2x Carbon fibre filled nylon spacers
  • 2x Seals
  • 1x IGUS eyelet bushing

To aid removal, the shaft has a 6mm hex in the centre, so you can hold the shaft while removing the second bolt. 

Please check your frame specification for the correct width. 

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How To Buy

You can buy from any of our approved resellers or fitting centres. Click here from more.


How do I fit it? Fitting instructions here, if you're experienced in shock servicing, or get one of our approved fitting centres to fit for you.

How to I tune it? Get one of our approved fitting centres to fit it with a recommended tune for your requirements, or use the damping curve data included in your kit to choose you're desired damping curve. Then just fit the appropriate shims.

Do my adjusters change? Your adjusters physically stay exactly the same, you'll just have a different level of damping for each click, depending on the shim stack fitted.

Does this affect my shock's warranty? Yes, it does void your warranty. However, the gain in performance is huge!

Do I need to use different seals? No, you can use standard seals, or one of our seal kits.

What spring rate do I need? Try our spring calculator to get you in the right ball park for the amount sag you're after. Or speak to your preferred fitting centre for advice.