Comparison of tire sizes 285/60 R18 and 275/65 R18
285/60R18
285
Tire width 
60
Profile height 
R18
Tire diameter 
398
RPM per km 285mm171mm799mm2511mm
285
60
18
275
65
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 799 | 815 | +16 (+2%) | ||
| Width, mm | 285 | 275 | -10 (-3.5%) | ||
| Circumference, mm | 2511 | 2559 | +48 (+1.9%) | ||
| Profile height, mm | 171 | 179 | +8 (+4.7%) | ||
| RPM per km | 398 | 391 | -7 (-1.8%) | ||
| Clearance change, mm | +8 | ||||
| Result: | The diameter differs by 2%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 101.9 |
| Difference (km/h) | 1.9 |
Sizes for comparison of tires 285/60 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 275/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
