Moto Gear Ratio Calculator RPM
Sprocket Speed Shift Analyzer
$1.99 · Designed for iPad. Not verified for macOS.
The ultimate motorcycle gearing analyzer for riders, mechanics, and tuning enthusiasts. Calculate exact speed at any RPM, visualize shift points, and compare sprocket combinations — all in one powerful tool.
DIAL IN YOUR GEARING
Enter your gear ratios, primary drive ratio, sprocket sizes, and tire dimensions. Drag the RPM slider and instantly see your speed in any gear on beautifully animated gauges. Switch between km/h and mph with a single tap.
INTERACTIVE GAUGES & GRAPHS
Live RPM tachometer and speedometer with real-time needle animation
Gear Ratio / Shift Point graph showing RPM drop and speed at each shift
Sprocket Spread graph to discover equivalent ratio combinations
Compare Sprockets chart for side-by-side visual analysis
SHIFT & TRACE
Set your shift RPM, hit Trace, and watch the app animate through every gear — recording shift points, RPM drops, and speeds. Choose Shift At or Shift To modes. Adjust animation speed from slow-motion to lightning fast. Enable repeat to loop continuously.
COMPARE EVERYTHING
Toggle Compare Sprockets to add a second front/rear sprocket set. The speedometer shows two needles simultaneously so you can see exactly how a sprocket swap changes your speed in every gear. Compare tire sizes too — see the effect of a different tire diameter on your final drive.
COMPLETE DATA TABLES
Scrollable speed/RPM tables show calculated speed for every gear at every RPM increment. Customize max RPM range and increment steps. Compare tables appear automatically when comparison mode is active.
SAVE & EXPORT
Save unlimited bike configurations and switch between them instantly. Export a comprehensive PDF report with all input data, speed tables, shift point analysis, and sprocket comparisons — perfect for sharing with your mechanic or posting in forums.
BUILT FOR RIDERS
Whether you are choosing sprockets for the track, optimizing street gearing for highway comfort, or just geeking out over drivetrain math — this app gives you every number you need. Supports 3 to 8 speed transmissions, any tire size, and any primary drive ratio.
No ads. No subscriptions. One purchase, full power.
Ratings & Reviews
The developer, Vladislav Zhirnov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Vladislav Zhirnov
- Size
- 4.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - iPad
Requires iPadOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
English and 31 more
- English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
4+
- 4+
- Copyright
- © zhirnov.zsystems
