Comparison of tire sizes 285/70 R17 and 285/60 R18
285/70R17
285
Tire width 
70
Profile height 
R17
Tire diameter 
383
RPM per km 285mm200mm831mm2610mm
285
70
17
285
60
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 831 | 799 | -32 (-3.9%) | ||
| Width, mm | 285 | 285 | 0 (0%) | ||
| Circumference, mm | 2610 | 2511 | -99 (-3.8%) | ||
| Profile height, mm | 200 | 171 | -29 (-14.5%) | ||
| RPM per km | 383 | 398 | +15 (+3.9%) | ||
| Clearance change, mm | -16 | ||||
| Result: | The diameter differs by -3.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 96.2 |
| Difference (km/h) | -3.8 |
Sizes for comparison of tires 285/70 R17
R17
R16 -1
R18 +1
Sizes for comparison of tires 285/60 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
