Tyre size calculator

Equivalent sizes for the 235/30 R20 tyre

Sidewall height 71 mmDiameter 649 mm Circumference 2039 mmRevolutions/km 490

Approved rim widths according to ETRTO: 8,5"

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
225/35 R19	-1.37 %	98.6 km/h	8" – 7,5" – 8,5" – 9"	18 models in stockFrom CHF 74.90 Summer10 Winter2 All-season6
265/30 R19	-1.14 %	98.9 km/h	9,5" – 9" – 10"	2 models in stockFrom CHF 172.00 Summer2
235/35 R19	-0.27 %	99.7 km/h	8,5" – 8" – 9" – 9,5"	37 models in stockFrom CHF 75.90 Summer13 Winter11 All-season13
245/35 R19	+0.78 %	100.8 km/h	8,5" – 8" – 9" – 9,5"	34 models in stockFrom CHF 72.90 Summer12 Winter11 All-season11
255/35 R19	+1.88 %	101.9 km/h	9" – 8,5" – 9,5" – 10"	43 models in stockFrom CHF 81.90 Summer9 Winter17 All-season17

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
265/25 R20	-1.29 %	98.7 km/h	—	—
225/30 R20	-0.94 %	99.1 km/h	8"	—
235/30 R20 Your size	0 %	100.0 km/h	8,5"	4 models in stockFrom CHF 162.00 Summer4
245/30 R20	+0.94 %	100.9 km/h	8,5" – 8" – 9"	9 models in stockFrom CHF 76.90 Summer6 Winter3
255/30 R20	+1.84 %	101.8 km/h	9" – 8,5" – 9,5"	10 models in stockFrom CHF 78.90 Summer8 Winter2