Rollout
Calculator
This calculator will allow you
to determine the correct rollout ratio based
on just a few inputs.
Data
Input
Results
If
you do not understand any particular
term, just slide your mouse
over it for a definition
Outer
Tire Diameter

Spur
Gear

Pinion
Gear

Transmission
Ratio


: 1
(check
gear ratios on popular models
)
A higher rollout number results
in slower acceleration and greater
top speed. Lower rollout results
in the opposite.
Tire
Circumference


Pinion:Spur
Ratio


Gearing
Quotient


Rollout
Ratio


Although this calculator
works for most motors, some require different
gearing to compensate for heat issues. Always
check your motor every few minutes to see if
it is getting too hot. With a properly geared
motor, you should be able to hold your finger
directly in the center of the can for at least
5 seconds. Anything less than that, and you
are overgeared.
ROLLOUT CALCULATOR FROM RC UNIVERSE.