Brushed Motor Speed Calculator

Tools/Brushed Speed

Estimate top speed for brushed RC vehicles from motor turns, voltage, gearing, and tire size.

Motor TurnsLower turns = faster. Common: 13T–21T sport, 27T stock, 35T–55T crawler.Voltage (V)7.2V = 6-cell NiMH, 7.4V = 2S LiPo, 8.4V = 7-cell NiMHPinion TeethSpur TeethDiff Pinion TeethDiff Spur TeethTire Diameter (mm)Measure inflated outer diameter

38.4km/h

23.9 mph

FDR: 8.14 · Est. motor RPM: 15074

Brushed motor speed is a rough estimate. Real-world RPM varies significantly by motor design, wind, and condition. Use for directional planning only.

All speed figures are theoretical estimates based on motor specifications and geometry. Real-world results vary.

Brushless Speed →Gear Ratio →