Comparison of tire sizes 275/65 R18 and 265/65 R18
275/65R18
275
Tire width 
65
Profile height 
R18
Tire diameter 
391
RPM per km 275mm179mm815mm2559mm
275
65
18
265
65
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 815 | 802 | -13 (-1.6%) | ||
| Width, mm | 275 | 265 | -10 (-3.6%) | ||
| Circumference, mm | 2559 | 2519 | -40 (-1.6%) | ||
| Profile height, mm | 179 | 172 | -7 (-3.9%) | ||
| RPM per km | 391 | 397 | +6 (+1.5%) | ||
| Clearance change, mm | -7 | ||||
| Result: | The diameter differs by -1.6%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.4 |
| Difference (km/h) | -1.6 |
Sizes for comparison of tires 275/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 265/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
