Comparison of tire sizes 165/80 R13 and 145/65 R15
165/80R13
165
Tire width 
80
Profile height 
R13
Tire diameter 
536
RPM per km 165mm132mm594mm1867mm
165
80
13
145
65
15
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 594 | 570 | -24 (-4%) | ||
| Width, mm | 165 | 145 | -20 (-12.1%) | ||
| Circumference, mm | 1867 | 1789 | -78 (-4.2%) | ||
| Profile height, mm | 132 | 94 | -38 (-28.8%) | ||
| RPM per km | 536 | 559 | +23 (+4.3%) | ||
| Clearance change, mm | -12 | ||||
| Result: | The diameter differs by -4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 95.8 |
| Difference (km/h) | -4.2 |
Sizes for comparison of tires 165/80 R13
R13
R14 +1
R15 +2
Sizes for comparison of tires 145/65 R15
R15
R14 -1
R16 +1
R13 -2