An offline tire size calculator: compare two sizes, see the speedometer error and the sizes that roll the same, with a garage, wheel offset calculator and fitment report. No account, no ads.
What sizes can I type?
Whatever is on your sidewall: 225/45R17, P225/45R17, 225-45-17, 225 45 17, 225/45ZR17, LT265/70R17 and flotation sizes like 33x12.50R15. A service description such as 94W is accepted and read. If something cannot be read, the app says what is missing.
How is the speedometer error worked out?
From the overall diameter of each tire. A tire that is 2% taller covers 2% more road per turn, so when the speedometer says 100 you are really doing 102. The table shows several speeds, in km/h or mph.
Does the app tell me if a tire will fit my car?
No. It does arithmetic on the numbers printed on the tire. Fit depends on your wheels, arches, brakes and suspension, so check your vehicle handbook or a tire professional before fitting anything.
What does the purchase add, and is the comparison affected?
The comparison is free and always will be. The one-time purchase unlocks the Garage tab: saved setups, a wheel offset and poke calculator, and a shareable fitment report.
Does it work with no signal?
Entirely. Nothing is fetched, and everything is stored only on your phone.
Are there ads or a subscription?
Neither. One optional purchase, once.
Email quicksupport36@gmail.com and describe what happened. Including your device model and iOS version helps.
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