Comparison of tire sizes 255/65 R17 and 235/75 R15
255/65R17
255
Tire width 
65
Profile height 
R17
Tire diameter 
417
RPM per km 255mm166mm763mm2398mm
255
65
17
235
75
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 763 | 734 | -29 (-3.8%) | ||
| Width, mm | 255 | 235 | -20 (-7.8%) | ||
| Circumference, mm | 2398 | 2304 | -94 (-3.9%) | ||
| Profile height, mm | 166 | 176 | +10 (+6%) | ||
| RPM per km | 417 | 434 | +17 (+4.1%) | ||
| Clearance change, mm | -15 | ||||
| Result: | The diameter differs by -3.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 96.1 |
| Difference (km/h) | -3.9 |
Sizes for comparison of tires 255/65 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2
Sizes for comparison of tires 235/75 R15
R15
R16 +1
R17 +2
