I run the protrac wheels on both my SC10 2wd ( Proline front inboard hub conversion and rear 12mm wheel adapters ) and on my SC10 4x4 with no issues at all. I was able to use all my old wheels when I jumped ship from my protrac equipped Slash. Now I don't have to worry about different wheels fitting different things. But as 1fastslash said use serrated wheel nuts on the 4x4 and you won't loose your wheels.