Comparison of tire sizes 275/40 R17 and 285/35 R18
275/40R17
275
Tire width 
40
Profile height 
R17
Tire diameter 
488
RPM per km 275mm110mm652mm2048mm
275
40
17
285
35
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 652 | 657 | +5 (+0.8%) | ||
| Width, mm | 275 | 285 | +10 (+3.6%) | ||
| Circumference, mm | 2048 | 2063 | +15 (+0.7%) | ||
| Profile height, mm | 110 | 100 | -10 (-9.1%) | ||
| RPM per km | 488 | 485 | -3 (-0.6%) | ||
| Clearance change, mm | +3 | ||||
| Result: | The diameter differs by 0.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 100.7 |
| Difference (km/h) | 0.7 |
Sizes for comparison of tires 275/40 R17
R17
R16 -1
R18 +1
R19 +2
Sizes for comparison of tires 285/35 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2