Tyre size calculator

Equivalent sizes for the 205/45 R18 tyre

Sidewall height 92 mmDiameter 642 mm Circumference 2016 mmRevolutions/km 496

Approved rim widths according to ETRTO: 7" – 6,5" – 7,5"

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.

Tyre size equivalents

17″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
225/45 R17 -1.15 % 98.9 km/h 7,5" – 7" – 8" – 8,5"
205/50 R17 -0.75 % 99.3 km/h 6,5" – 5,5" – 6" – 7" – 7,5"
235/45 R17 +0.28 % 100.3 km/h 8" – 7,5" – 8,5" – 9"
195/55 R17 +0.71 % 100.7 km/h —
215/50 R17 +0.79 % 100.8 km/h 7" – 6" – 6,5" – 7,5"

18″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
215/40 R18 -1.94 % 98.1 km/h 7,5" – 7" – 8" – 8,5"
225/40 R18 -0.67 % 99.3 km/h 8" – 7,5" – 8,5" – 9"
205/45 R18 Your size 0 % 100.0 km/h 7" – 6,5" – 7,5"
235/40 R18 +0.55 % 100.6 km/h 8,5" – 8" – 9" – 9,5"
215/45 R18 +1.43 % 101.4 km/h 7" – 7,5" – 8"

19″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
215/35 R19 -1.31 % 98.7 km/h 7,5" – 7" – 8" – 8,5" —
225/35 R19 -0.24 % 99.8 km/h 8" – 7,5" – 8,5" – 9"
235/35 R19 +0.87 % 100.9 km/h 8,5" – 8" – 9" – 9,5"

20″

Size Difference Actual speed at 100 km/h on the speedometer ETRTO rims Tyres in stock
225/30 R20 +0.20 % 100.2 km/h 8" —
235/30 R20 +1.15 % 101.2 km/h 8,5"

Sizes equivalent to 205/45 R18:

225/45 R17205/50 R17235/45 R17195/55 R17215/50 R17215/40 R18225/40 R18235/40 R18215/45 R18215/35 R19225/35 R19235/35 R19225/30 R20235/30 R20

205/45 R18 tyres in stock

View all 3 205/45 R18 tyres ›

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