Yeah I was thinking grip would be the hardest thing given how low the CoG is going to be on the cars. Something like some new minipins on something like a carpet tile could probably give enough grip, either that or else just have it propped up on the ground and lift it up. I guess as long as the exact method used is the same between measurements it would be pretty accurate. Just tried mine and its 34.85mm
As to how usefull this information is to an off-road rc car, i've no idea.
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