Tyre size calculator

Equivalent sizes for the 285/40 R21 tyre

Sidewall height 114 mmDiameter 761 mm Circumference 2392 mmRevolutions/km 418

Approved rim widths according to ETRTO: 10" – 9,5" – 10,5" – 11"

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.

Tyre size equivalents

20″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
265/45 R20 -1.97 % 98.0 km/h 9" – 8,5" – 9,5" – 10"
275/45 R20 -0.80 % 99.2 km/h 9" – 8,5" – 9,5" – 10" – 10,5"
255/50 R20 +0.20 % 100.2 km/h 8" – 7" – 7,5" – 8,5" – 9"
285/45 R20 +0.40 % 100.4 km/h 9,5" – 9" – 10" – 10,5"
265/50 R20 +1.50 % 101.5 km/h 8,5" – 7,5" – 8" – 9" – 9,5"
295/45 R20 +1.57 % 101.6 km/h 10" – 9,5" – 10,5" – 11"

21″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
285/40 R21 Your size 0 % 100.0 km/h 10" – 9,5" – 10,5" – 11"
295/40 R21 +1.03 % 101.0 km/h 10,5" – 10" – 11" – 11,5"
265/45 R21 +1.37 % 101.4 km/h 9" – 8,5" – 9,5" – 10"

22″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
275/35 R22 -1.33 % 98.7 km/h 9,5" – 9" – 10" – 10,5" – 11"
285/35 R22 -0.43 % 99.6 km/h 10" – 9,5" – 10,5" – 11"
265/40 R22 +1.23 % 101.2 km/h 9,5" – 9" – 10" – 10,5"

Sizes equivalent to 285/40 R21:

265/45 R20275/45 R20255/50 R20285/45 R20265/50 R20295/45 R20295/40 R21265/45 R21275/35 R22285/35 R22265/40 R22

285/40 R21 tyres in stock

View all 15 285/40 R21 tyres ›

This information is provided for guidance only and does not engage Rupteur's liability in any way.