Comparison of tire sizes 285/65 R18 and 285/75 R16

285/65R18
285 Tire width
65 Profile height
R18 Tire diameter
385 RPM per km
285mm185mm828mm2600mm
285
65
18
285
75
16
Parameters Sizes Old New
Diameter, mm828834+6 (+0.7%)
Width, mm2852850 (0%)
Circumference, mm26002620+20 (+0.8%)
Profile height, mm185214+29 (+15.7%)
RPM per km385382-3 (-0.8%)
Clearance change, mm+3
Result:
The diameter differs by 0.7%.
Speedometer reading (km/h)
Real speed (km/h)100.8
Difference (km/h)0.8

Sizes for comparison of tires 285/65 R18

R18
R17 -1
R16 -2
R20 +2

Sizes for comparison of tires 285/75 R16

R16
R17 +1
R18 +2