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Tire Size & Fitment Upsize
Speedo error, gearing, chart
Yaniv van der Stigchel · Utilities
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App info
- Developer
- Yaniv van der Stigchel
- Category
- Utilities, Reference
- Released
- Sep 29, 2026
- Version
- 1.1.1 (Oct 21, 2026)
- Price
- Free
- Size
- 5.1 MB
- Requires
- iOS 17.0
- Age rating
- 4+
- Languages
- English, German, Portuguese, Russian, Spanish
In-app purchases
| Tire Size Pro | $3.99 |
Current prices, App Store US.
🔒 Price history4 snapshots: when prices changed and new plans appearedGet Pro access
About Tire Size & Fitment Upsize
Before you spend several hundred on new tires, find out what they will actually change. Tire Size compares any two sizes and tells you the truth about the swap: the real diameter difference, how much the ride height moves, what happens to your gearing, and how far out your speedometer will read. WHAT IT TELLS YOU Speedometer error, in figures. Your speedometer is calibrated for the size that left the factory. Change the rolling diameter and it lies to you. This shows by how much, at 60 mph for free, and at every speed you drive with Pro. The diameter and sidewall change. In millimeters and in inches, with the percentage difference, so you know whether it clears. Ride height and clearance. How much higher or lower the car sits, and how much closer the tire gets to the arch. Effective gearing. A taller tire changes your final drive ratio whether you wanted it to or not. See it before you…
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