[EricH]

Originally Posted by caume

I was mostly joking when I said it's a 6WD. Obviously, the only real similarity is the number of wheels. Where did you get the information about omnis being less grippy? I'm not doubting it at all, I just haven't been able to find info about the CoF when I've looked.

0.8-0.88 for an AM 6" aluminum omni (AM site)
A 6" "normal" wheel (rubber tread, not high grip) is 0.9 (AM site).
"HiGrip" wheels are 0.95.

That's going to be a 10%-20% increase in grippiness when using non-omni wheels instead of omniwheels.