Comparison of tire sizes 225/65 R18 and 225/75 R16
225/65R18
225
Tire width 
65
Profile height 
R18
Tire diameter 
425
RPM per km 225mm146mm750mm2355mm
225
65
18
225
75
16
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 750 | 744 | -6 (-0.8%) | ||
| Width, mm | 225 | 225 | 0 (0%) | ||
| Circumference, mm | 2355 | 2337 | -18 (-0.8%) | ||
| Profile height, mm | 146 | 169 | +23 (+15.8%) | ||
| RPM per km | 425 | 428 | +3 (+0.7%) | ||
| Clearance change, mm | -3 | ||||
| Result: | The diameter differs by -0.8%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 99.2 |
| Difference (km/h) | -0.8 |
Sizes for comparison of tires 225/65 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 225/75 R16
R16
R15 -1
R17 +1
R18 +2
