Tyre size calculator

Equivalent sizes for the 275/45 R21 tyre

Sidewall height 124 mmDiameter 781 mm Circumference 2453 mmRevolutions/km 408

Approved rim widths according to ETRTO: 9" – 8,5" – 9,5" – 10" – 10,5"

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
265/50 R20	-1.01 %	99.0 km/h	8,5" – 7,5" – 8" – 9" – 9,5"	22 models in stockFrom CHF 164.00 Summer7 Winter8 All-season7
295/45 R20	-0.94 %	99.1 km/h	10" – 9,5" – 10,5" – 11"	5 models in stockFrom CHF 200.00 Summer1 Winter4
275/50 R20	+0.29 %	100.3 km/h	8,5" – 7,5" – 8" – 9" – 9,5"	13 models in stockFrom CHF 207.00 Summer3 Winter10
255/55 R20	+0.98 %	101.0 km/h	—	26 models in stockFrom CHF 98.90 Summer5 Winter12 All-season9
285/50 R20	+1.56 %	101.6 km/h	9" – 8" – 8,5" – 9,5" – 10"	3 models in stockFrom CHF 190.00 Summer2 All-season1

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
295/40 R21	-1.46 %	98.5 km/h	10,5" – 10" – 11" – 11,5"	17 models in stockFrom CHF 143.00 Summer11 Winter5 All-season1
265/45 R21	-1.14 %	98.9 km/h	9" – 8,5" – 9,5" – 10"	17 models in stockFrom CHF 202.00 Summer7 Winter10
275/45 R21 Your size	0 %	100.0 km/h	9" – 8,5" – 9,5" – 10" – 10,5"	31 models in stockFrom CHF 102.00 Summer8 Winter16 All-season7

Size	Difference	Actual speed at 100 km/h on the speedometer	ETRTO rims	Tyres in stock
265/40 R22	-1.27 %	98.7 km/h	9,5" – 9" – 10" – 10,5"	18 models in stockFrom CHF 183.00 Summer7 Winter10 All-season1
275/40 R22	-0.26 %	99.7 km/h	9,5" – 9" – 10" – 10,5" – 11"	18 models in stockFrom CHF 205.00 Summer9 Winter7 All-season2
295/40 R22	+1.79 %	101.8 km/h	10,5" – 10" – 11" – 11,5"	3 models in stockFrom CHF 251.00 Summer1 Winter2