Division 6.1Lateral roll

Division 6.1—Lateral roll

6.1.1 Position the quad bike on the tilt table with each wheel centred on a load cell.

6.1.2 Quad bikes are to be tested facing in both directions, to account for offset CoG position where this occurs. Both results must be reported. The quad bike’s characteristic lateral roll stability result is to be the lower of the 2 results achieved from testing in both roll directions.

6.1.3 Align the quad bike so that a line passing through the outer edges of the 2 downhill tyres is parallel to the line of the tilt axis of the tilt table.

6.1.4 Set the steering mechanism in the straight ahead position.

6.1.5 Apply the park brake or park mechanism to stop the quad bike from rolling.

6.1.6 Affix 2 catch straps (of less than 1 kg mass) between the quad bike and the tilt table with sufficient slack to allow full decompression (extension) of the uphill suspension and minimal wheel lift at tip‑over.

6.1.7 Raise the tilt table until both uphill tyres have lost contact with the ground (that is, both uphill load cells show no load).

6.1.8 Record the tilt table angle at the moment of second uphill wheel lift (tip‑over).

6.1.9 Return the tilt table to the horizontal position.

6.1.10 The static rollover threshold of the vehicle in g’s of lateral acceleration (1g = acceleration due to gravity), referred to as the tilt table ratio (or TTR), is calculated as Tan of tilt platform angle at 2 wheel lift (Tan Ø). The TTR is approximately equal to the static stability factor (or SSF) with variation due to CoG displacement due to vehicle body roll and suspension articulation, compliance in steering and suspension joints and deformation of the wheels and tyres.