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Pure geometry and SI conversions. Useful at the tyre machine and on the counter. Not a fitment guarantee and not a TPMS relearn procedure.
Stock diameter
634.3 mm
Sidewall 101.3 mm
Fitted diameter
645.2 mm
+1.72% vs stock
True speed at indicated
101.7 km/h
When the cluster shows 100
Pound-feet
81.1 lbf·ft
Back to Nm
110 Nm
Kilopascals
220.6 kPa
Back to PSI
32 PSI
°F
68 °F
Back to °C
20 °C
Overall diameter = 2 × section × (aspect/100) + rim inches × 25.4. A taller tyre makes the cluster read slow; a shorter tyre reads fast. Plus-sizing that changes diameter or offset can move load index, speedo error, and — after an alignment — ADAS calibration. That last step is an I-CAR question, not a geometry question.
Geometry only. Load index is ETRTO typical kg — confirm the sidewall and the vehicle plate.