Tyre size calculator

Equivalent sizes for the 305/30 R20 tyre

Sidewall height 92 mmDiameter 691 mm Circumference 2171 mmRevolutions/km 461

Approved rim widths according to ETRTO: 11" – 10,5" – 11,5"

To be approved, a tyre's diameter may differ by no more than 2 %. The vehicle's load and speed indices must also be respected.

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
325/30 R19	-1.91 %	98.1 km/h	11,5" – 11" – 12"	—
285/35 R19	-1.29 %	98.7 km/h	10" – 9,5" – 10,5" – 11"	3 models in stockFrom CHF 194.00 Summer2 Winter1
295/35 R19	-0.26 %	99.7 km/h	10,5" – 10" – 11" – 11,5"	4 models in stockFrom CHF 330.00 Summer3 Winter1
275/40 R19	+1.69 %	101.7 km/h	9,5" – 9" – 10" – 10,5" – 11"	30 models in stockFrom CHF 91.90 Summer14 Winter11 All-season5

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
285/30 R20	-1.73 %	98.3 km/h	10" – 9,5" – 10,5"	3 models in stockFrom CHF 225.00 Summer1 Winter2
295/30 R20	-0.85 %	99.2 km/h	10,5" – 10" – 11"	11 models in stockFrom CHF 207.00 Summer6 Winter5
305/30 R20 Your size	0 %	100.0 km/h	11" – 10,5" – 11,5"	5 models in stockFrom CHF 194.00 Summer3 Winter2
275/35 R20	+1.40 %	101.4 km/h	9,5" – 9" – 10" – 10,5" – 11"	24 models in stockFrom CHF 90.90 Summer13 Winter10 All-season1