Comparison of tire sizes 275/70 R18 and 265/70 R18
275/70R18
275
Tire width 
70
Profile height 
R18
Tire diameter 
378
RPM per km 275mm193mm842mm2646mm
275
70
18
265
70
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 842 | 828 | -14 (-1.7%) | ||
| Width, mm | 275 | 265 | -10 (-3.6%) | ||
| Circumference, mm | 2646 | 2602 | -44 (-1.7%) | ||
| Profile height, mm | 193 | 186 | -7 (-3.6%) | ||
| RPM per km | 378 | 384 | +6 (+1.6%) | ||
| Clearance change, mm | -7 | ||||
| Result: | The diameter differs by -1.7%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 98.3 |
| Difference (km/h) | -1.7 |
Sizes for comparison of tires 275/70 R18
R18
R17 -1
R16 -2
R20 +2
Sizes for comparison of tires 265/70 R18
R18
R17 -1
R16 -2
R20 +2