Document ID: chunk:federal_register_of_legislation:F2006L01788:reg:120
Version: federal_register_of_legislation:F2006L01788
Segment Type: reg
Provision Reference: reg 120
Character Range: 26883–28859

120                  1,400

TABLE 3
MINIMUM BREAKING ENERGY VALUES (JOULES)

                                 PRESSURES SPECIFIED IN kPa  PRESSURES SPECIFIED
                                                             IN psi
Test inflation pressure     180  220                          24                    28   32
Breaking  Energy  (joules)  295  585                         295                   440  585

For tyres with a test inflation pressure other than as specified above, the required minimum breaking energy value is given by the relevant formulae shown below:

B.E. (Joules) = 7.35  (P1 -140)   B.E. (Joules) = 36.7  (P2 -16)
where: P1  = test pressure in kPa  where: P2  = test pressure in psi

For rayon 'Diagonal Ply Tyres' or rayon 'Bias-Belted Tyres', the required breaking energy value is to be reduced by 36.5 per cent.

For tyres with 'Specified Design Section Width' less than 160 mm (or 6.30 inches) the required breaking energy value is to be reduced (or further reduced) by 25.0 per cent.

TABLE 4
SPEED CATEGORY  FOR  TYRE

'SPEED CATEGORY'
SYMBOL                                                 L    M    N    P    Q    R    S    T    U    H    V    W    Y    Z
'Maximum Vehicle Speed 24/00' for which tyre is rated
(km/h)                                                 120  130  140  150  160  170  180  190  200  210  240  270  300  over 240

For tyres marked with a - or in the absence of any of the above symbols,
the 'Speed Category' must be as follows:

                                                 km/h
Diagonal or Bias-Belted  10 inch 'Rim' Diameter  120
                         12 inch 'Rim' Diameter  135
                         13 inch 'Rim' Diameter
                         and over                150

Radial                   All 'Rim' Diameters     170

Figure 1 - 'Bead' Unseating Fixture
Note - Dimensions in mm

'Test Rim' Nominal                   Dimension A
Diameter
inches                               mm