- Odometer332,000 km
- TransmissionAutomatic
- BodyWagon
- FuelDiesel
Recently serviced and four new tyres fitted. Electric brakes. Runs well.
“Rolling diameter” is the effective overall diameter your tyre presents when actually moving under load, not just what’s on the sidewall.
To estimate from a size like 225/50R17: Sidewall = width × aspect = 225 × 0.50 = 112.5 mm; Overall diameter ≈ 2 × sidewall + rim (in mm) = 2 × 112.5 + 17 × 25.4 ≈ 657 mm; Circumference ≈ π × diameter ≈ 2.06 m.
Real rolling diameter is typically 1–3% smaller thanks to tyre deflection, which is why manufacturers quote revs per kilometre.
When upsizing, keep overall diameter within about ±2–3% of OEM to keep the speedo, ABS and gearing happy.
If you need precision, measure revolutions per kilometre on the spec sheet or a GPS run, then back‑calc diameter.
Consult official documentation for exact figures.

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