Comparison of tire sizes 245/40 R18 and 215/50 R16
245/40R18
245
Tire width 
40
Profile height 
R18
Tire diameter 
487
RPM per km 245mm98mm653mm2052mm
245
40
18
215
50
16
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 653 | 621 | -32 (-4.9%) | ||
| Width, mm | 245 | 215 | -30 (-12.2%) | ||
| Circumference, mm | 2052 | 1952 | -100 (-4.9%) | ||
| Profile height, mm | 98 | 108 | +10 (+10.2%) | ||
| RPM per km | 487 | 512 | +25 (+5.1%) | ||
| Clearance change, mm | -16 | ||||
| Result: | The diameter differs by -4.9%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 95.1 |
| Difference (km/h) | -4.9 |
Sizes for comparison of tires 245/40 R18
R18
R17 -1
R19 +1
R16 -2
R20 +2
Sizes for comparison of tires 215/50 R16
R16
R15 -1
R17 +1
R14 -2
R18 +2
