Chassis• The .025 Cheetah 7 center section is no longer legal.
• Spec chassis must remain in its original form (Cheetah 7 mounting pans may be reversed). No other modifications or cutting are allowed.
• Plating, paint and/or stain may be added to or removed from the chassis.
• Replacement steel pans sold by the original manufacturer may be used.
• Rear uprights may be braced through the use of a U-shaped brace, brass tube or Slick 7-style chassis brace.
• Body mounting pin tubes may be added in the original body mounting clip holes on the chassis.
• Each class has its own list of legal chassis and modifications.
• All front wheels must be round and roll when a thumb is run on them from the bottom of the chassis.
• Spacers and/or tape may be used to limit the movement of chassis sections.
• Lead weight may be glued onto the chassis in all classes.
• Steel guide tongue reinforcements may be used, but the original guide tongue may not be modified or moved.

Measurements• All chassis and gears must have a minimum of 1/16" track clearance, at the rear of the chassis at the start of all races.
• Maximum width of the car is 3¼" at all points, at all times, including wheels/tires.
• If the tech tool fits over the wheel rims, regardless of how tight, the width is legal.
• If a racer changes tires, the car may be re-tech'ed before returned to the track.
• If a racer changes tires while the race power is on, it may be checked at the end of the heat.

Axles• All axles must be solid and pass through the chassis uprights.
• Each class has its own minimum axle size requirements.
• Axles may not extend beyond wheel edge.

Bearings/Bushings• No ball bearings are allowed.
• Oilites may be soldered or glued in place.
• Any oilite bushings are allowed and they may be modified by the racer.