Comparison of tire sizes 235/50 R18 and 275/45 R18
235/50R18
235
Tire width 
50
Profile height 
R18
Tire diameter 
460
RPM per km 235mm118mm692mm2175mm
235
50
18
275
45
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 692 | 705 | +13 (+1.9%) | ||
| Width, mm | 235 | 275 | +40 (+17%) | ||
| Circumference, mm | 2175 | 2214 | +39 (+1.8%) | ||
| Profile height, mm | 118 | 124 | +6 (+5.1%) | ||
| RPM per km | 460 | 452 | -8 (-1.7%) | ||
| Clearance change, mm | +7 | ||||
| Result: | The diameter differs by 1.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 101.8 |
| Difference (km/h) | 1.8 |
Sizes for comparison of tires 235/50 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 275/45 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2