1. What is the Go Kart Speed Formula?

The Go Kart Speed Formula calculates the theoretical maximum speed of a go kart based on engine RPM, tire circumference, and gear ratio. It helps enthusiasts and builders estimate their kart's performance.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( MPH \) — Miles per hour
• \( RPM \) — Engine revolutions per minute
• \( tire\ circumference \) — Tire circumference in inches
• \( gear\ ratio \) — Overall gear ratio (dimensionless)
• 63360 — Conversion factor (inches in a mile)

Explanation: The formula converts engine RPM to wheel RPM using the gear ratio, then calculates distance traveled per hour based on tire circumference.

3. Importance of Speed Calculation

Details: Accurate speed estimation helps in gear ratio selection, performance tuning, and safety considerations when building or modifying go karts.

4. Using the Calculator

Tips: Enter engine RPM (typically 3000-6000 for most small engines), measure tire circumference by rolling the kart one revolution, and calculate gear ratio as (axle sprocket teeth ÷ clutch/engine sprocket teeth).

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire circumference?
A: Mark the tire and ground, roll the kart one complete revolution, then measure the distance between marks on the ground.

Q2: What's a typical gear ratio for go karts?
A: Most karts use 5:1 to 8:1 ratios. Lower ratios (numerically higher) provide more acceleration but lower top speed.

Q3: Why doesn't my kart reach calculated speed?
A: The formula shows theoretical maximum. Real speed is affected by weight, friction, aerodynamics, and engine power curve.

Q4: How does tire pressure affect speed?
A: Higher pressure increases tire diameter slightly, which can increase speed but reduce traction.

Q5: Can I use this for other small vehicles?
A: Yes, the formula works for any wheeled vehicle where you know the input parameters.