6-4
Tyres, wheels, ballasting
X6 - P/N 6525032M1
TYRE PRESSURES, LOAD CAPACITIES AND SERVICE
Tyres can be marked in two ways, as shown in the examples below:
CROSSPLY STRUCTURE: Example
12.4-24 8PR
12.4 = Nominal tyre width in inches
- = Crossply structure
24 = Internal diameter
8PR = 8 ply rating
For correct tyre pressures/load capacities for CROSSPLY tyres see your dealer or tyre manufacturer.
RADIAL - Example
1
6
5
B
18.4R38
18.4 = Nominal tyre width in inches
R = Radial structure
38 = Internal diameter
142 = Load index number, 142 =2.650 kg (see
chart 1)
A8 = Speed code for 40 Kph, (see chart 2)
710/75R34
710 = Nominal tyre width in mm
75 = Nominal aspect ratio (ratio of sidewall height/sec-
tion width)
R = Radial structure
34 = Rim diameter at the bead seat in inches
168 = Load index number, 168 = 5,600 kg (see chart 1)
A8 = Speed code for 40 Kph, (see chart 2)
165 = Load index number, 165 = 5.150 kg (see chart 1)
B = Speed code for 50 kph, (see chart 2)
The performance of a radial tyre is determined by the load index and speed code which have replaced the ply rating
found on crossply tyres.
The maximum load which can be carried by a tyre is dependant upon the Load Index quoted on the tyre wall. Charts 1
and 2, on the following page, give a guide to the maximum load a tyre can carry and a percentage (%) variation depend-
ing upon the speed code or travel speed.
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