How to Read Truck Tyres

How to Read Truck Tyres

Content:
– Truck tyres: specific features and importance of rolling resistance
– Trucks: tyres adapted to each axle
– Truck tyre: marking and indices

Truck tyre: specific features and importance of rolling resistance


A truck tyre is a component with extreme performance for professional use. The truck tyre is mainly tubeless and radial ply, using the same technologies as those used for passenger tyres.

Suitable for vehicles with a GVW (Gross Vehicle Weight Rating) of more than 3.5 tonnes, a truck tyre is larger and must in particular offer robustness, endurance and fuel-saving capacity.

With each revolution of the wheel, the tyre deforms on contact with the road and dissipates energy in the form of heat. This force is called rolling resistance and is responsible for 20% of the forces that naturally brake a car (the other forces being aerodynamic friction, mechanical friction, etc.).

On a truck, this rolling resistance is responsible for about 33% of the energy dissipated. In other words, one out of every three fill-ups of petrol is dissipated via the tyres, hence the need to focus on “green” technologies to reduce these effects.

Trucks: tyres adapted to each axle

In contrast to passenger car tyres, truck tyres cannot be fitted on all axles and a model is specific to a particular position on the vehicle:
– The steering axle is the front axle, directly involved in the orientation of the vehicle.
– The drive axle is the rear axle of a truck that is linked to the engine and transmits acceleration. The wheels are generally twinned on this axle, which therefore has four wheels, except in the case of adapted tyre models that allow two tyres to be replaced by a wider tyre.
– Carrying axles are trailer axles that follow the direction and traction imposed by the towing truck.
A model designed for one axle cannot be fitted to another axle. There are, however, all-position models that can be positioned in any position, but they are clearly defined as such by the manufacturers.

Truck tyre: marking and indices

Truck Tyres

The marking of the truck tyre is the same as for the passenger car tyre, i.e.:
– 335 = section = width of the tyre in millimetres (mm).
– 55 = series = ratio (in %) between the height of the tyre and the section (width). It is therefore a figure that gives an idea of the height of the sidewall, in other words, the “thickness” of the tyre.
– R is the radial structure of the tyre.
– 22.5 = inside diameter = rim diameter in inches (“).
– 91: load index corresponding to the maximum load in kg that the tyre can support.
– V: speed index corresponding to the maximum speed at which the tyre can be driven while maintaining the range of its performance.

The following table illustrates the figures corresponding to each speed code.

SPEED CODES

Speed code

Speed in km/h

A1

5

A2

10

A3

15

A4

20

A5

25

A6

30

A7

35

A8

40

B

50

C

60

D

65

E

70

F

80

G

90

J

100

K

110

L

120

M

130

N

140

The following table illustrates the figures corresponding to each load index.

LOAD INDICES

Index

Load kg

Index

Load kg

Index

Load kg

Index

Load kg

100

800

123

1 550

146

3 000

169

5 800

101

825

124

1 600

147

3 075

170

6 000

102

850

125

1 650

148

3 150

171

6 150

103

875

126

1 700

149

3 250

172

6 300

104

900

127

1 750

150

3 350

173

6 500

105

925

128

1 800

151

3 450

174

6 700

106

950

129

1 850

152

3 550

175

6 900

107

975

130

1 900

153

3 650

176

7 100

108

1 000

131

1 950

154

3 750

177

7 300

109

1 030

132

2 000

155

3 875

178

7 500

110

1 060

133

2 060

156

4 000

179

7 750

111

1 090

134

2 120

157

4 125

180

8 000

112

1 120

135

2 180

158

4 250

181

8 250

113

1 150

136

2 240

159

4 375

182

8 500

114

1 180

137

2 300

160

4 500

183

8 750

115

1 215

138

2 360

161

4 625

184

9 000

116

1 250

139

2 430

162

4 750

185

9 250

117

1 285

140

2 500

163

4 875

186

9 500

118

1 320

141

2 575

164

5 000

187

9 750

119

1 360

142

2 650

165

5 150

188

10 000

120

1 400

143

2 725

166

5 300

189

10 300

121

1 450

144

2 800

167

5 450

190

10 600

122

1 500

145

2 900

168

5 600

191

10 900

If you are looking for a tyre shop, second-hand truck tyres, new truck tyres or even cheap truck tyres, you can visit GILL VIC TYRES in the Dandenong area.

Coming soon, our next section will cover:

Regrooving: a second life given to the truck tyre;

– Retreading: a third life given to the truck tyre;

– A variety of uses for this type of tyre;

– Truck tyre legislation.

Follow us on Cars and Motors Online and don’t forget to leave your comments and also share your experience with our readers. See you next time!

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