Sidewall
Sports
Only for iPhone
Free
iPhone
Sidewall is a precision tire pressure calculator built specifically for cyclists who care about how their bike feels on the road, gravel, or trail.
Dial in the right pressure for your exact setup using multiple trusted calculation models. Save your bikes, wheelsets, and tire configurations. Compare algorithm outputs side by side. Adjust for conditions, temperature, and riding style. Sync seamlessly across your devices with iCloud.
Sidewall removes the guesswork so you can focus on the ride.
### Features
**Bike Support**
- Road, Gravel, and MTB categories
- Category-specific weight distribution defaults
- E-bike support with automatic weight adjustments
- Save unlimited bike profiles with photos
**Calculation Engines**
- Multiple tire calculation engines supported
**Setup Configuration**
- Multiple wheel/tire setups per bike
- Tire width with rim-width-aware actual width calculation
- 700c, 650b, 29", 27.5", and 26" wheel sizes
- Tubeless and tubed tire support
- Casing types: Lightweight, Standard, Reinforced
- Tire insert support for lower pressures
**Conditions & Adjustments**
- Surface conditions: Smooth, Average, Rough (road) / Chunky, Rowdy (gravel) / XC, Trail, Enduro (MTB)
- Wet condition toggle
- Speed category: Recreational, Enthusiast, Racer, Pro
- Temperature-aware calculations (inflation vs. riding temp)
- Gear weight per calculation
- Session weight override without affecting global settings
**Safety & Limits**
- Hooked and hookless rim guidance with automatic 72.5 PSI ETRTO max enforcement
- Custom tire and rim max pressure limits
- Visual clamping indicators for pressure limits
- Warning system with severity levels
**Units & Preferences**
- Pressure: PSI, bar, kPa
- Weight: kg, lbs
- Locale-aware defaults
**Data & Privacy**
- Fully offline functionality
- Private iCloud sync (no accounts, no tracking)
- Calculation history with saved conditions
- More information at https://timheuer.github.io/sidewallapp/privacy/
Sidewall is designed to be fast, clean, and purpose-built. No clutter. No unnecessary features. Just accurate pressure recommendations based on your setup.
**Because the difference is in the pressure.**
*Algorithm names reference publicly documented pressure calculation methods. Silca, Wolftooth, ENVE, Rene Herse, and SRAM are registered trademarks of their respective owners. This app is not affiliated with or endorsed by these companies.*
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
Minor bug fixes and sharing
The developer, Tim Heuer, 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
- Tim Heuer
- Size
- 1.6 MB
- Category
- Sports
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later.
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026, Tim Heuer