I swear I was reading about some fairly recently, now I'm home I'll see if I can find the topic again, bear with... EDIT** All I can find is in the Team Triforce build Diary, page 3, but it's not what I've seen before.
I'm thinking, T-shaped slots cut around the outer edge of the wheel and tyres cast on in moulds, but can't remember where I saw it. Sorry.
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