Comparison of tire sizes 275/60 R18 and 285/60 R18

275/60R18
275 Tire width
60 Profile height
R18 Tire diameter
404 RPM per km
275mm165mm787mm2473mm
275
60
18
285
60
18
Parameters Sizes Old New
Diameter, mm787799+12 (+1.5%)
Width, mm275285+10 (+3.6%)
Circumference, mm24732511+38 (+1.5%)
Profile height, mm165171+6 (+3.6%)
RPM per km404398-6 (-1.5%)
Clearance change, mm+6
Result:
The diameter differs by 1.5%.
Speedometer reading (km/h)
Real speed (km/h)101.5
Difference (km/h)1.5

Sizes for comparison of tires 275/60 R18

R18
R17 -1
R19 +1
R16 -2
R20 +2

Sizes for comparison of tires 285/60 R18

R18
R17 -1
R19 +1
R16 -2
R20 +2