Comparison of tire sizes 255/40 R19 and 235/45 R19
255/40R19
255
Tire width 
40
Profile height 
R19
Tire diameter 
464
RPM per km 255mm102mm687mm2157mm
255
40
19
235
45
19
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 687 | 694 | +7 (+1%) | ||
| Width, mm | 255 | 235 | -20 (-7.8%) | ||
| Circumference, mm | 2157 | 2181 | +24 (+1.1%) | ||
| Profile height, mm | 102 | 106 | +4 (+3.9%) | ||
| RPM per km | 464 | 459 | -5 (-1.1%) | ||
| Clearance change, mm | +4 | ||||
| Result: | The diameter differs by 1%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 101.1 |
| Difference (km/h) | 1.1 |
Sizes for comparison of tires 255/40 R19
R19
R18 -1
R20 +1
R17 -2
R21 +2
Sizes for comparison of tires 235/45 R19
R19
R18 -1
R20 +1
R17 -2
R21 +2
