Sidewall

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.