Comparison of tire sizes 285/65 R17 and 275/70 R18
285/65R17
285
Tire width 
65
Profile height 
R17
Tire diameter 
397
RPM per km 285mm185mm802mm2520mm
285
65
17
275
70
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 802 | 842 | +40 (+5%) | ||
| Width, mm | 285 | 275 | -10 (-3.5%) | ||
| Circumference, mm | 2520 | 2646 | +126 (+5%) | ||
| Profile height, mm | 185 | 193 | +8 (+4.3%) | ||
| RPM per km | 397 | 378 | -19 (-4.8%) | ||
| Clearance change, mm | +20 | ||||
| Result: | The diameter differs by 5%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 105 |
| Difference (km/h) | 5 |
Sizes for comparison of tires 285/65 R17
R17
R16 -1
R18 +1
R19 +2
Sizes for comparison of tires 275/70 R18
R18
R17 -1
R16 -2
R20 +2