Comparison of tire sizes 185/55 R15 and 165/70 R13

185/55R15
185 Tire width
55 Profile height
R15 Tire diameter
545 RPM per km
185mm102mm585mm1836mm
185
55
15
165
70
13
Parameters Sizes Old New
Diameter, mm585561-24 (-4.1%)
Width, mm185165-20 (-10.8%)
Circumference, mm18361763-73 (-4%)
Profile height, mm102115+13 (+12.7%)
RPM per km545567+22 (+4%)
Clearance change, mm-12
Result:
The diameter differs by -4.1%.
Speedometer reading (km/h)
Real speed (km/h)96
Difference (km/h)-4

Sizes for comparison of tires 185/55 R15

R15
R14 -1
R16 +1
R13 -2
R17 +2

Sizes for comparison of tires 165/70 R13

R13
R14 +1
R15 +2