Comparison of tire sizes 155/70 R12 and 175/60 R13
155/70R12
155
Tire width 
70
Profile height 
R12
Tire diameter 
610
RPM per km 155mm109mm522mm1639mm
155
70
12
175
60
13
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 522 | 540 | +18 (+3.4%) | ||
| Width, mm | 155 | 175 | +20 (+12.9%) | ||
| Circumference, mm | 1639 | 1697 | +58 (+3.5%) | ||
| Profile height, mm | 109 | 105 | -4 (-3.7%) | ||
| RPM per km | 610 | 589 | -21 (-3.4%) | ||
| Clearance change, mm | +9 | ||||
| Result: | The diameter differs by 3.4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 103.5 |
| Difference (km/h) | 3.5 |
Sizes for comparison of tires 155/70 R12
R12
R13 +1
R14 +2
Sizes for comparison of tires 175/60 R13
R13
R12 -1
R14 +1
R15 +2
