ARTICLE 6: GENERAL CHASSIS RULES
T6.1 Suspension
T6.1.1 The car must be equipped with a fully operational suspension system with shock absorbers, front and
rear, with usable wheel travel of at least 50.8 mm (2 inches), 25.4 mm (1 inch) jounce and 25.4 mm (1
inch) rebound, with driver seated. The judges reserve the right to disqualify cars which do not
represent a serious attempt at an operational suspension system or which demonstrate handling
inappropriate for an autocross circuit.
T6.1.2 All suspension mounting points must be visible at Technical Inspection, either by direct view or by
removing any covers.
T6.2 Ground Clearance
Ground clearance must be sufficient to prevent any portion of the car, other than the tires, from
touching the ground during track events. Intentional or excessive ground contact of any portion of the
car other than the tires will forfeit a run or an entire dynamic event.
Comment: The intention of this rule is that sliding skirts or other devices that by design, fabrication
or as a consequence of moving, contact the track surface are prohibited and any unintended contact
with the ground which either causes damage, or in the opinion of the ‘dynamic event organizers’
could result in damage to the track, will result in forfeit of a run or an entire dynamic event
T6.3 Wheels
T6.3.1 The wheels of the car must be 203.2 mm (8.0 inches) or more in diameter.
T6.3.2 Any wheel mounting system that uses a single retaining nut must incorporate a device to retain the nut
and the wheel in the event that the nut loosens. A second nut (“jam nut”) does not meet these
requirements.