Comparison of tire sizes 225/45 R18 and 225/40 R19
225/45R18
225
Tire width 
45
Profile height 
R18
Tire diameter 
483
RPM per km 225mm101mm660mm2073mm
225
45
18
225
40
19
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 660 | 663 | +3 (+0.5%) | ||
| Width, mm | 225 | 225 | 0 (0%) | ||
| Circumference, mm | 2073 | 2082 | +9 (+0.4%) | ||
| Profile height, mm | 101 | 90 | -11 (-10.9%) | ||
| RPM per km | 483 | 480 | -3 (-0.6%) | ||
| Clearance change, mm | +2 | ||||
| Result: | The diameter differs by 0.5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 100.4 |
| Difference (km/h) | 0.4 |
Sizes for comparison of tires 225/45 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 225/40 R19
R19
R18 -1
R20 +1
R17 -2
R21 +2
