Comparison of tire sizes 165/80 R13 and 185/65 R13

165/80R13
165 Tire width
80 Profile height
R13 Tire diameter
536 RPM per km
165mm132mm594mm1867mm
165
80
13
185
65
13
Parameters Sizes Old New
Diameter, mm594571-23 (-3.9%)
Width, mm165185+20 (+12.1%)
Circumference, mm18671793-74 (-4%)
Profile height, mm132120-12 (-9.1%)
RPM per km536558+22 (+4.1%)
Clearance change, mm-12
Result:
The diameter differs by -3.9%.
Speedometer reading (km/h)
Real speed (km/h)96
Difference (km/h)-4

Sizes for comparison of tires 165/80 R13

R13
R14 +1
R15 +2

Sizes for comparison of tires 185/65 R13

R13
R14 +1
R15 +2