Comparison of tire sizes 235/55 R18 and 275/55 R17
235/55R18
235
Tire width 
55
Profile height 
R18
Tire diameter 
445
RPM per km 235mm129mm716mm2248mm
235
55
18
275
55
17
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 716 | 734 | +18 (+2.5%) | ||
| Width, mm | 235 | 275 | +40 (+17%) | ||
| Circumference, mm | 2248 | 2307 | +59 (+2.6%) | ||
| Profile height, mm | 129 | 151 | +22 (+17.1%) | ||
| RPM per km | 445 | 433 | -12 (-2.7%) | ||
| Clearance change, mm | +9 | ||||
| Result: | The diameter differs by 2.5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 102.6 |
| Difference (km/h) | 2.6 |
Sizes for comparison of tires 235/55 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 275/55 R17
R17
R16 -1
R18 +1
R15 -2
R19 +2