J-TECH Suspension Ltd

J-TECH HD Mount Kit 1/2" Trek Trunnion Bolt Conversion

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  • £17.50

Please note. Trek bikes use different bolt styles from bike to bike. Please look at images 2 & 3 carefully. IF you bike use the bolt style pictured in image 3, then this product is incorrect for your bike. please see the Standard 1/2 HD Mount kit.

Trek bikes with Thrushaft shocks use a Trunnion mount style shock mounting on a non-standard trunnion size shock. 

This means your choice of replacement aftermarket shocks is Zero. However here at J-TECH we have created a mount kit alternative meaning you can fit a 230mm standard eyelet shock to your bike with the standard Trunnion bolts you already have (no additional bolt conversion kit required).  

It's a Heavy Duty mount kit consisting of a high grade stainless steel shaft, 2x 3D Printed Nylon Spacers, 2x rubber seals and a high quality, hard wearing IGUS eyelet bushing.

The threads are M10x1mm, for use with standard Trunnion bolts and the shaft has a 6mm hexagon in the centre, allowing easy removal. 

Please note stroke lengths of the shock must be checked before fitting to Trek Rail bikes. Shock to Frame clearance is an issue when using some models of shock.


For all shocks with 1/2" compatible mounting hardware.  Shocks that require 1/2" mount kits have a 15.07mm eyelet and use a 12.7mm shaft.
Manufacturer  Compatible
EXT All EXT Shocks
Fox All Fox Shocks
Rockshox All Rock Shox Shocks
Marzocchi All Marzocchi Shocks
Ohlins Please Contact/Measure
Cane Creek All IL Models, Other models please contact/measure.
Bos 2016 Onward, Pre-16 use 12mm
Manitou Some Models, Please measure