Comparison of tire sizes 155/70 R12 and 145/70 R13
155/70R12
155
Tire width
70
Profile height
R12
Tire diameter
610
RPM per km
155mm109mm522mm1639mm
155
70
12
145
70
13
Parameters Sizes | Old | New | |||
---|---|---|---|---|---|
Diameter, mm | 522 | 533 | +11 (+2.1%) | ||
Width, mm | 155 | 145 | -10 (-6.5%) | ||
Circumference, mm | 1639 | 1675 | +36 (+2.2%) | ||
Profile height, mm | 109 | 102 | -7 (-6.4%) | ||
RPM per km | 610 | 597 | -13 (-2.1%) | ||
Clearance change, mm | +6 | ||||
Result: | The diameter differs by 2.1%. |
Speedometer reading (km/h) | |
---|---|
Real speed (km/h) | 102.2 |
Difference (km/h) | 2.2 |
Sizes for comparison of tires 155/70 R12
R12
R13 +1
R14 +2
Sizes for comparison of tires 145/70 R13
R13
R12 -1
R14 +1