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RC Car Pinion & Spur Gear Ratio Top Speed Calculator

Ratio = spur ÷ pinion; speed from RPM and tire circumference.

Estimate RC gear ratio and top speed from pinion/spur and tire. Planning estimates only — verify measurements independently.

Inputs

830
3090
10006000
3.722
28

Smart analysis

Recommendations

Tailored to your live inputs and result—guidance only, not professional advice.

  • Interpret

    Treat this as a planning estimate

    Primary result: Gear ratio = 3.00. Re-run with optimistic and pessimistic inputs to understand the range—not just a single point.

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Plain-English guide

Terms & how it works

Confused by a field? Read the short definitions here while you use the tool.

  • Pinion teeth

    The “Pinion teeth” value used in this tool’s formula. Adjust it to see results update live.

  • Spur teeth

    The “Spur teeth” value used in this tool’s formula. Adjust it to see results update live.

  • Motor KV

    The “Motor KV” value used in this tool’s formula. Adjust it to see results update live.

  • Battery voltage (V)

    The “Battery voltage (V)” value used in this tool’s formula. Adjust it to see results update live.

  • Tire diameter (in)

    The “Tire diameter (in)” value used in this tool’s formula. Adjust it to see results update live.

How this calculator works

Estimate RC gear ratio and top speed from pinion/spur and tire. Planning estimates only — verify measurements independently. Ratio = spur ÷ pinion; speed from RPM and tire circumference. Example: 16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.

Ratio = spur ÷ pinion; speed from RPM and tire circumference.

Example: 16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.

When to use this RC Car Pinion Spur Gear Ratio

Common use cases

  • Estimate RC gear ratio and top speed from pinion/spur and tire.
  • Sanity-check with this case: 16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.
  • The relationship is: Ratio = spur ÷ pinion; speed from RPM and tire circumference.

Localized examples

  • Event Planning & Niche Hobbies: the example on this page uses the same formula as the widget.

What you get

  • Fields: Pinion teeth, Spur teeth, Motor KV, Battery voltage (V)
  • Ratio = spur ÷ pinion; speed from RPM and tire circumference.
  • Example on the page: 16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.

How to Calculate RC Car Pinion Spur Gear Ratio Step-by-Step

  1. 1Enter Pinion teeth, Spur teeth, Motor KV, then the remaining fields. Use the values you have, not a catalog average, unless that is all you know.
  2. 2Ratio = spur ÷ pinion; speed from RPM and tire circumference.
  3. 3Worked case: 16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.
  4. 4Order a little extra. Resin, fabric, and clay do not read a spreadsheet.

Governing formula

Ratio = spur ÷ pinion; speed from RPM and tire circumference.

16T pinion, 48T spur, 3500 KV, 2S → ratio 3.0 and speed est.

Example: set Pinion teeth = 16, Spur teeth = 48, Motor KV = 3,500, then read the result.

Variable definitions

  • pinionTeeth

    Pinion teeth

    The “Pinion teeth” field. Default 16; typical range 8–30.

  • spurTeeth

    Spur teeth

    The “Spur teeth” field. Default 48; typical range 30–90.

  • motorKv

    Motor KV

    The “Motor KV” field. Default 3500; typical range 1000–6000.

  • batteryVoltage

    Battery voltage (V)

    The “Battery voltage (V)” field. Default 7.4; typical range 3.7–22.

  • tireDiameterIn

    Tire diameter (in)

    The “Tire diameter (in)” field. Default 4; typical range 2–8.

  • Volume math (Ratio = spur ÷ pinion; speed from RPM and tire circumference.) does not include your waste, test pour, or the batch that cures wrong. Add a buffer.
  • Nothing here is uploaded for the calculation itself.

Frequently Asked Questions

Ratio = spur ÷ pinion; speed from RPM and tire circumference.

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Reviews & Ratings

See what others think about this tool, then leave your own rating to help improve CalculioHub.

4.8

out of 5.0

4 reviews

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Your rating

Aisha K.

Mar 12, 2026

Clean layout and the results update instantly. Exactly what I needed for a quick planning check.

Daniel R.

Feb 28, 2026

Very usable on mobile. Would love a save/export option later, but the math feels solid.

Priya S.

Feb 3, 2026

The FAQ section answered my questions before I even had to search. Smooth dark mode too.

Marcus L.

Jan 19, 2026

Simple inputs, clear outputs. This replaced three bookmarks I used to juggle.

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