Comparison of tire sizes 175/65 R15 and 185/50 R16
175/65R15
175
Tire width 
65
Profile height 
R15
Tire diameter 
523
RPM per km 175mm114mm609mm1912mm
175
65
15
185
50
16
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 609 | 591 | -18 (-3%) | ||
| Width, mm | 175 | 185 | +10 (+5.7%) | ||
| Circumference, mm | 1912 | 1858 | -54 (-2.8%) | ||
| Profile height, mm | 114 | 93 | -21 (-18.4%) | ||
| RPM per km | 523 | 538 | +15 (+2.9%) | ||
| Clearance change, mm | -9 | ||||
| Result: | The diameter differs by -3%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 97.2 |
| Difference (km/h) | -2.8 |
Sizes for comparison of tires 175/65 R15
R15
R14 -1
R16 +1
R13 -2
R17 +2
Sizes for comparison of tires 185/50 R16
R16
R15 -1
R17 +1
R14 -2
R18 +2
