I'm not sure as haven't tried it, but you might will be able to fit Mi4 hexes on Cat. You'll might need to use some shims though. That's if you mean that you want to use wheels that have std 12mm.
If you need to mount front Losi/AE style wheels - best bet is to get schumacher hex for losi, or AE B44 hex for AE and JConcepts wheels
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