Diameter change
— —Nominal geometry, clearly compared
See what a tire-size change actually changes.
Compare diameter, sidewall, nominal radius change, wheel revolutions, and estimated speedometer effect. Everything runs in this page—no uploads, cookies, or tracking.
01 / COMPARE
Enter two passenger-metric sizes
02 / RESULT
Geometry comparison
Radius change
— positive means a larger radiusEstimated speed
— —Width change
— nominal section width| Measurement | Original | Replacement | Change |
|---|
03 / BOUNDARY
Geometry is not fitment.
TireShift does not evaluate wheel width, offset, bolt pattern, brake or suspension clearance, rubbing, load rating, speed rating, pressure, ABS behavior, legality, or manufacturer approval.
Published size is nominal. Actual dimensions and loaded rolling radius vary by tire, wheel, pressure, load, wear, and construction. The threshold is a comparison heuristic—not a safety rule.