⚙️ RC gear ratio calculator
Your rollout, your speed and your rpm live. Electric or nitro. With the reverse calculation to aim for a target speed, and a setup tip.
1/8 off-road electric
1/10 off-road 2WD
1/10 off-road 4WD
1/10 On-road (TC)
1/10 Short Course
Maxx (monster)
X-Maxx (XL)
Mini-Z 1/27
↑ more teeth = longer gearing · more speed
↑ more teeth = shorter gearing · more acceleration
Rollout
– mm/motor turn
Final ratio
–
Speed
–
km/h
Wheel rpm
–
tr/min
mph
–
● Pinion 20 teeth (motor)
● Spur 50 teeth (wheels)
The small pinion (motor) turns several times while the big spur gear (wheels) turns once. That's the gear reduction: the bigger the spur gear is compared to the pinion, the shorter the gearing.
–
Theoretical values, without mechanical losses or rpm drop under load.
Keep your gear ratios by track and by car in your Pitboard garage, right next to your lap times.
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