Outdoor1
GETTING STARTED
Click for more info!
OUTDOOR RACING
What you need to know!
PRE-REGISTRATION
Click to pre-register!
Home
About DR
Getting Started
General Rules / Procedure
Outdoor Racing
Outdoor Track Info
Outdoor Classes & Rules
Outdoor Schedule
Outdoor Registration Form
Outdoor News Archive
Outdoor Results/Stats
2020 Outdoor Points/Results
2020 Outdoor Race Results
2020 Outdoor Points
2019 Outdoor Results (ALL)
Outdoor Archived Results (’03-’09)
2025 DirtRunners 38th Challenge Info:
Indoor Racing
Indoor News Archive
Indoor Results/Stats
2018-2019 Indoor Results – ALL
Indoor Archived Results (’03-’09)
Indoor Registration Form
Indoor Schedule
Indoor Track Info
Indoor Classes & Rules
Media
Photos
Videos
Newsletter
Contact Us
Membership
Rollout Calculator
Tire Diameter
The diameter of your tire measured from the outer edges
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.