Comparison of tire sizes 165/80 R13 and 145/65 R15

165
80
13
145
65
15
165/80R13
tire
165 Tire width
80 Profile height
R13 Tire diameter
RPM per km
tire
165mm132mm594mm1867mm536
Parameters Sizes Old New
Diameter, mm594570-24 (-4%)
Width, mm165145-20 (-12.1%)
Circumference, mm18671789-78 (-4.2%)
Profile height, mm13294-38 (-28.8%)
RPM per km536559+23 (+4.3%)
Clearance change, mm-12
Speedometer reading (km/h)95.8-4.2
Result:
The diameter differs by -4%.

Sizes for comparison of tires 165/80 R13

R13
R14 +1
R15 +2