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Original data dives — every figure computed at build time by the same engine as the calculators, not typed by hand.
Twelve Plus-Size Swaps, Computed: What Changing Tire Size Actually Does to Your Speedometer
We ran 12 common OE-to-plus-size tire swaps through the comparison engine: only 8 of 12 stay under the 3% line, and the worst misreads your speed by 3 mph.
3.73 vs 4.10 vs 4.56: Cruising RPM Across Six Tire Sizes, Computed
A 3.73-to-4.10 regear raises 70-mph cruise RPM by 9.9% on any tire; going 265/70R17 to 35-inch tires quietly undoes a 4.10 as if you had installed a 3.71.