Comparison of tire sizes 235/65 R17 and 255/65 R17
235/65R17
235
Tire width 
65
Profile height 
R17
Tire diameter 
432
RPM per km 235mm153mm737mm2316mm
235
65
17
255
65
17
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 737 | 763 | +26 (+3.5%) | ||
| Width, mm | 235 | 255 | +20 (+8.5%) | ||
| Circumference, mm | 2316 | 2398 | +82 (+3.5%) | ||
| Profile height, mm | 153 | 166 | +13 (+8.5%) | ||
| RPM per km | 432 | 417 | -15 (-3.5%) | ||
| Clearance change, mm | +13 | ||||
| Result: | The diameter differs by 3.5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 103.5 |
| Difference (km/h) | 3.5 |
Sizes for comparison of tires 235/65 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2
Sizes for comparison of tires 255/65 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2