Comparison of tire sizes 225/65 R18 and 235/65 R18
225/65R18
225
Tire width 
65
Profile height 
R18
Tire diameter 
425
RPM per km 225mm146mm750mm2355mm
225
65
18
235
65
18
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 750 | 763 | +13 (+1.7%) | ||
| Width, mm | 225 | 235 | +10 (+4.4%) | ||
| Circumference, mm | 2355 | 2396 | +41 (+1.7%) | ||
| Profile height, mm | 146 | 153 | +7 (+4.8%) | ||
| RPM per km | 425 | 417 | -8 (-1.9%) | ||
| Clearance change, mm | +7 | ||||
| Result: | The diameter differs by 1.7%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 101.7 |
| Difference (km/h) | 1.7 |
Sizes for comparison of tires 225/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 235/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2