Tyre size calculator

Equivalent sizes for the 275/30 R20 tyre

Sidewall height 83 mmDiameter 673 mm Circumference 2114 mmRevolutions/km 473

Approved rim widths according to ETRTO: 9,5" – 9" – 10"

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
255/35 R19	-1.77 %	98.2 km/h	9" – 8,5" – 9,5" – 10"	41 models in stockFrom CHF 81.90 Summer9 Winter16 All-season16
305/30 R19	-1.13 %	98.9 km/h	11" – 10,5" – 11,5"	1 model in stockFrom CHF 197.00 Summer1
265/35 R19	-0.75 %	99.3 km/h	9,5" – 9" – 10" – 10,5"	14 models in stockFrom CHF 136.00 Summer8 Winter6
275/35 R19	+0.30 %	100.3 km/h	9,5" – 9" – 10" – 10,5" – 11"	35 models in stockFrom CHF 92.90 Summer15 Winter13 All-season7
245/40 R19	+0.83 %	100.8 km/h	8,5" – 8" – 9" – 9,5"	47 models in stockFrom CHF 81.90 Summer17 Winter18 All-season12
285/35 R19	+1.32 %	101.3 km/h	10" – 9,5" – 10,5" – 11"	3 models in stockFrom CHF 196.00 Summer2 Winter1

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
305/25 R20	-1.89 %	98.1 km/h	11" – 10,5" – 11,5"	—
255/30 R20	-1.81 %	98.2 km/h	9" – 8,5" – 9,5"	10 models in stockFrom CHF 78.90 Summer8 Winter2
265/30 R20	-0.91 %	99.1 km/h	9,5" – 9" – 10"	7 models in stockFrom CHF 205.00 Summer2 Winter5
275/30 R20 Your size	0 %	100.0 km/h	9,5" – 9" – 10"	18 models in stockFrom CHF 174.00 Summer9 Winter6 All-season3
285/30 R20	+0.87 %	100.9 km/h	10" – 9,5" – 10,5"	3 models in stockFrom CHF 225.00 Summer1 Winter2
245/35 R20	+0.94 %	100.9 km/h	8,5" – 8" – 9" – 9,5"	29 models in stockFrom CHF 81.90 Summer14 Winter7 All-season8
295/30 R20	+1.77 %	101.8 km/h	10,5" – 10" – 11"	11 models in stockFrom CHF 210.00 Summer6 Winter5