R2 GearCalc
Gearing calculator
Only for iPhone
Free
iPhone
Gear ratio calculator for drift and race cars.
Pick your gearbox, final drive and tire size and instantly see:
• wheel speed in every gear at your shift RPM
• RPM drop on every upshift
• a clear RPM vs speed sawtooth chart
• speed per 1000 RPM for every gear
WINTERS QUICK CHANGE BUILT IN
The full Winters Performance 8500-series 10-spline gear chart is included: 67 spur gear sets with 4.12, 4.57 and 4.86 ring & pinion options. Ratios are computed from exact tooth counts. Star the sets you own to build your inventory and swap between them in one tap to compare setups.
269 GEARBOX PRESETS
Factory ratio presets from popular manual and automatic transmissions (ZF GS6-53DZ selected by default), or enter a manual final drive ratio for any other setup.
TIRE SIZE YOUR WAY
Enter the outside diameter in millimeters or a metric size like 225/45R17, with common presets one tap away.
BUILT FOR THE TRACK
High-contrast dark interface with bright accents that stays readable in direct sunlight. No account, no ads, no data collection — everything stays on your device and works offline.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Yury Rak, 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
- Yury Rak
- Size
- 47.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 R2 M-Sport