Diameter of the internal hole of front fork:28.6mm(general specification for mountain bikes).
Max length: 120mm
Fit for all bikes if the measurement meet your requirement.
Function:If you think the front fork for your bike is short for you,then this stem riser adjuster can solve your problem and meet your requirement,it can increase Max height by 70mm,you can adjust the gaskets to adjust the preferred height,and the package will contain 4 gaskets.
Version 1:
First,remove your own bontrager,secondly install our stem riser and tighten up,thirdly install your own bontrager onto our stem riser.
Version 2:
Insert stem-up onto the fork stem and place height adjusters onto stem-up until your preferred height level for your stem.Stem and wheel in the same direction and tighten clamping bolts of the stem
Package
1 xBicycle Heads Up Stem Riser Handlebar Silver