Comparison of tire sizes 155/70 R12 and 165/65 R13
155/70R12
155
Tire width 
70
Profile height 
R12
Tire diameter 
610
RPM per km 155mm109mm522mm1639mm
155
70
12
165
65
13
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 522 | 545 | +23 (+4.4%) | ||
| Width, mm | 155 | 165 | +10 (+6.5%) | ||
| Circumference, mm | 1639 | 1711 | +72 (+4.4%) | ||
| Profile height, mm | 109 | 107 | -2 (-1.8%) | ||
| RPM per km | 610 | 584 | -26 (-4.3%) | ||
| Clearance change, mm | +12 | ||||
| Result: | The diameter differs by 4.4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 104.4 |
| Difference (km/h) | 4.4 |
Sizes for comparison of tires 155/70 R12
R12
R13 +1
R14 +2
Sizes for comparison of tires 165/65 R13
R13
R14 +1
R15 +2