These 25mm aluminium wheel hex adapters from GPM provide a reliable method to increase track width on an Axial SCX10 II, improving lateral stability without altering core driveline geometry. The adapters are drilled for a 4mm shaft and use an o-ring on one side and a spring steel ring on the other for axial retention, secured by a stainless steel screw. A Delrin collar is fitted to fix the hex in position, ensuring consistent wheel and tyre alignment under crawling load.