Gravity 3 was geared for 15km/h.
Tough as Nails for a smidgeon faster, 18km/h
Bullfrog can get up to 14km/h.


Lets take a hypothetical setup.

250KV, 37V 250mm wheels.

With a 5-1 ratio you end up with ludricous speed.
0.25m x pi x (280x37)x60/1000= 97km/h

With 130KV motors, it's still more than 40km/h

With 130KV motors and a 15-1 gearratio you're back in the normal range. Between 12 and 20km/h.

Some machines are build to be faster. But getting the power to the floor is a problem.