Transmission Ratio Calculator
Calculate transmission gear ratios, final drive ratios, and understand how they affect vehicle performance. Optimize your gearing for acceleration or top speed.
Step 1: Transmission Details
Understanding Gear Ratios
Gear ratios determine how engine power is transferred to the wheels. Lower ratios (higher numbers) provide more torque for acceleration, while higher ratios (lower numbers) allow for higher top speeds at lower RPM.
Step 2: Vehicle & Calculation Options
About Transmission Ratios
The overall gear ratio is calculated by multiplying the transmission gear ratio by the final drive ratio. This determines how many times the engine rotates for each wheel rotation, affecting acceleration and top speed.
Transmission Ratio Results
Overall Drive Ratio (1st Gear)
Gear Ratio Comparison
| Gear | Transmission Ratio | Overall Ratio | % Step |
|---|
Speed per Gear at Redline
Transmission Ratio Formula
Overall Ratio = Gear Ratio × Final Drive Ratio
To calculate the overall drive ratio, multiply the transmission gear ratio by the final drive ratio. This determines how many times the engine rotates for each wheel rotation. Speed is calculated using: Speed = (RPM × Tire Circumference) / (Overall Ratio × 336) for MPH.
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