Comparison of tire sizes 235/60 R18 and 225/55 R19
235/60R18
235
Tire width 
60
Profile height 
R18
Tire diameter 
431
RPM per km 235mm141mm739mm2322mm
235
60
18
225
55
19
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 739 | 730 | -9 (-1.2%) | ||
| Width, mm | 235 | 225 | -10 (-4.3%) | ||
| Circumference, mm | 2322 | 2294 | -28 (-1.2%) | ||
| Profile height, mm | 141 | 124 | -17 (-12.1%) | ||
| RPM per km | 431 | 436 | +5 (+1.2%) | ||
| Clearance change, mm | -5 | ||||
| Result: | The diameter differs by -1.2%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.8 |
| Difference (km/h) | -1.2 |
Sizes for comparison of tires 235/60 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 225/55 R19
R19
R18 -1
R20 +1
R17 -2
R21 +2