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TIRE CONVERSIONS-, SPEEDINDEX- and LOADINDEX TABLE.

Tire size conversion:

Tire

Size

Height

Circumference

Standard

/ R

cm

cm

New

/ R

cm

cm

Difference

cm

cm

%

Standard

Speed (on Tacho)

km/h

km/h

km/h

km/h

New

Speed (effective)

km/h

km/h

km/h

km/h

 


The difference in percentage should not exceed:
- More than 1,5%
- Less than 2%


Loadindex table:

(Beware! This is for each tire!)

Load index lb Load index lb Load index lb
60 550 82 1045 104 1980
61 565 83 1071 105 2035
62 583 84 1100 106 2090
63 598 85 1133 107 2145
64 616 86 1166 108 2200
65 638 87 1200 109 2266
66 660 88 1232 110 2332
67 675 89 1275 111 2400
68 693 90 1320 112 2465
69 715 91 1353 113 2530
70 737 92 1385 114 2595
71 760 93 1430 115 2673
72 780 94 1475 116 2750
73 803 95 1518 117 2825
74 825 96 1562 118 2905
75 851 97 1605 119 2992
76 880 98 1650 120 3080
77 906 99 1705 121 3190
78 935 100 1760 122 3300
79 960 101 1815 123 3410
80 990 102 1870 124 3520
81 1015 103 1925 125 3630


Speed index table:

Rating: K L M N P Q R S T H V W Y ZR
Max. km/h 110 120 130 140 150 160 170 180 190 210 240 270 300 240+
Max. mph 68 75 81 87 93 100 106 113 118 130 150 168 186 149+

More markings on tyre

Metric to Inch size converter

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