Comparison of tire sizes 245/40 R20 and 235/50 R18

245/40R20
245 Tire width
40 Profile height
R20 Tire diameter
452 RPM per km
245mm98mm704mm2212mm
245
40
20
235
50
18
Parameters Sizes Old New
Diameter, mm704692-12 (-1.7%)
Width, mm245235-10 (-4.1%)
Circumference, mm22122175-37 (-1.7%)
Profile height, mm98118+20 (+20.4%)
RPM per km452460+8 (+1.8%)
Clearance change, mm-6
Result:
The diameter differs by -1.7%.
Speedometer reading (km/h)
Real speed (km/h)98.3
Difference (km/h)-1.7

Sizes for comparison of tires 245/40 R20

R20
R19 -1
R21 +1
R18 -2
R22 +2

Sizes for comparison of tires 235/50 R18

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

Ads by size 235/50 R18