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Calculation of tire size 255/40 R19
2
5
5
/
4
0
R
1
9
255
Tire width
40
Profile height
R19
Tire diameter
464
RPM per km
255
mm
102
mm
687
mm
2157
mm
Enter size
255
/
40
R
19
New size
195
/
65
R
15
Calculate
inches
millimeter
Parameters Sizes
Diameter
687
mm
Width
255
mm
Circumference
2157
mm
Profile height
102
mm
RPM per km
464
Parameters Sizes
Old
New
Diameter,
mm
687
Width,
mm
255
Circumference,
mm
2157
Profile height,
mm
102
RPM per km
464
Clearance change,
mm
Result:
Speedometer reading (km/h)
Real speed (km/h)
Difference (km/h)
0
Sizes for comparison of tires 255/40 R19
R19
225/40 R19 -3.5%
225/45 R19 -0.3%
235/45 R19 +1%
245/40 R19 -1.2%
245/45 R19 +2.3%
255/35 R19 -3.8%
255/45 R19 +3.6%
265/35 R19 -2.8%
265/40 R19 +1.2%
275/35 R19 -1.7%
275/40 R19 +2.3%
285/35 R19 -0.7%
285/40 R19 +3.5%
295/30 R19 -3.9%
295/35 R19 +0.3%
R18
-1
215/55 R18 +1%
225/45 R18 -3.9%
225/50 R18 -0.7%
225/55 R18 +2.6%
235/45 R18 -2.6%
235/50 R18 +0.7%
245/45 R18 -1.3%
245/50 R18 +2.2%
255/40 R18 -3.8%
265/40 R18 -2.6%
265/45 R18 +1.3%
275/40 R18 -1.5%
275/45 R18 +2.6%
285/40 R18 -0.3%
295/35 R18 -3.3%
R20
+1
225/35 R20 -3.1%
235/35 R20 -2%
245/35 R20 -1%
245/40 R20 +2.5%
255/30 R20 -3.8%
255/40 R20 +3.6%
265/30 R20 -2.9%
265/35 R20 +1%
275/30 R20 -2%
275/35 R20 +2%
285/30 R20 -1.2%
285/35 R20 +3.1%
295/30 R20 -0.3%
R17
-2
215/55 R17 -2.8%
215/60 R17 +0.4%
215/65 R17 +3.5%
225/55 R17 -1.2%
225/60 R17 +2.2%
235/50 R17 -2.9%
235/55 R17 +0.4%
235/60 R17 +3.9%
245/55 R17 +2%
255/45 R17 -3.8%
255/55 R17 +3.6%
285/40 R17 -3.9%
R21
+2
245/35 R21 +2.6%
255/30 R21 -0.1%
255/35 R21 +3.6%
285/30 R21 +2.5%
295/25 R21 -0.9%
295/30 R21 +3.3%