Racing Diffs vs Tire Sizes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Racing Diffs
Calculate your vehicle's top speed for each gear using transmission ratios, differential gear ratio, and rev limit. Optimize your car's gear ratio for track performance or drag racing, choosing between kmh and mph units.
- Top speed calculation per gear
- Input tire dimensions
- Input transmission gear ratios
- Input final drive ratio
- Input rev limit
- Supports kmh and mph
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This application provides accurate top speed calculations based on your transmission ratios and differential gear ratio. It gives you information about maximal speed by each gear. Variables that you need to fill are: Tire dimension Transmission gear ratios Final drive ratio REV limit You can also choose between kmh and mph. The info provided by this app is crucial for any track and motorsport enthusiast who wishes to optimize the car's gear ratio to best suit a particular track. It helps you to find the perfect balance between top speed and acceleration which is also the key point for drag racers.
Tire Sizes
Find essential tire dimensions and receive suggestions for new tire sizes. Compare wheels visually and by specifications like offset and width. Discover factory tire sizes for your car and compare motorcycle tires across different measurement systems.
- Tire dimension calculations
- New tire size suggestions
- Wheel comparison (visual and specs)
- Offset and width comparison
- Motorcycle tire comparison
- Factory tire size lookup
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Using this app you can find all the necessary tire dimensions and get suggestions for new tire sizes, compare different wheels and find all the deviations, see and compare visual images of wheels, also compare two wheels by their offset and width, compare motorcycle tires in alpha, metric and inches. Most importantly, you can find the factory tire size for your car.
Screenshots
Verdict
The clearest difference is rating: Tire Sizes at 4.5 against Racing Diffs's 2.5. Tire Sizes also leads on ratings volume (82 vs 2). Racing Diffs's advantage is in-app purchases (none vs 1) and iOS requirement (14.4 vs 17.0). On price, update cadence, ads and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Tire Sizes sells 1 one-off in-app purchase. Racing Diffs asks for nothing beyond the download.
Tire Sizes holds the better App Store score, 4.5 against 2.5. That said, the two scores are not equally well evidenced: Tire Sizes has 82 ratings behind it against 2, so its average is the more settled of the two.
Racing Diffs ships an update every 5 weeks, Tire Sizes every 6 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | Racing Diffs | Tire Sizes |
|---|---|---|
| Price | Free | Free |
| Rating | 2.5 (2 ratings) | 4.5 (82 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 2 | 82 — better |
| Update frequency | Every 5 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 6 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Imperio | Zaven Hovhannisyan |
Customer experience
Racing Diffs
Tire Sizes
In-app purchases
Racing Diffs
No in-app purchases
Tire Sizes
- Remove Ads$3.99
Questions
Is Racing Diffs free?
Is Tire Sizes free?
Which has better reviews, Racing Diffs or Tire Sizes?
Do Racing Diffs or Tire Sizes have ads?
Which is updated more often, Racing Diffs or Tire Sizes?
Other comparisons
