Comparison of tire sizes 135/80 R13 and 155/70 R12
135/80R13
135
Tire width 
80
Profile height 
R13
Tire diameter 
583
RPM per km 135mm108mm546mm1716mm
135
80
13
155
70
12
| Parameters Sizes | Old | New | |||
|---|---|---|---|---|---|
| Diameter, mm | 546 | 522 | -24 (-4.4%) | ||
| Width, mm | 135 | 155 | +20 (+14.8%) | ||
| Circumference, mm | 1716 | 1639 | -77 (-4.5%) | ||
| Profile height, mm | 108 | 109 | +1 (+0.9%) | ||
| RPM per km | 583 | 610 | +27 (+4.6%) | ||
| Clearance change, mm | -12 | ||||
| Result: | The diameter differs by -4.4%. | ||||
| Speedometer reading (km/h) | |
|---|---|
| Real speed (km/h) | 95.5 |
| Difference (km/h) | -4.5 |
Sizes for comparison of tires 135/80 R13
R13
R14 +1
R15 +2
Sizes for comparison of tires 155/70 R12
R12
R13 +1
R14 +2
