(Last changed - Jan 2021)
Amendments for the 2021 racing season are indicated in blue. Amendments made during the 2021 racing season (if any) are indicated in purple.
- Cars must have four wheels with tyres and a body.
- Car body must be a 1/32 scale model of an actual car, past or present. Body may not be modified in a way which significantly lightens it or renders it indistinguishable from original car. Transparent bodies must be painted. All cars must have racing numbers displayed at least on each side. Owners are encouraged to include other realistic-looking decoration on their cars, such as sponsor advertising and number roundels.
- A driver figure comprising at least a head must be present in the driver position of the car unless the specific class allows the windows to be tinted so as not to reveal the cockpit. Open cockpit cars require a driver and a "shelf"; closed cars require at least a driver head, front and rear glass and a cover over the mechanicals. (With the exception of cars where the windows are tinted.)
- All tyres must be of a silicone, rubber, rubber-like or urethane construction. No o-ring or sponge tires allowed.
- All tyres must be run DRY, with no traction compounds or treatments added. Cleaner residue or softening treatments must have been removed before placing the car on the track.
- Non-magnetic ballast may be added to cars. For classes that stipulate any variation of the USD rule, ballast added must be positioned within 2.5" (64mm) of and no further back than the rear axle.
- Ballast or magnets added to the underside of the chassis must be securely affixed so as to not be dislodged during a race. They must also be completely insulated from electrical conductivity.
- The body mounting screws may be loosened. If they are, suitable steps must be taken to prevent them falling on to the track.
- Any braid may be used.
- Where a minimum ground clearance is specified, for magnet classes, this minimum only applies to areas under all installed magnets. For non-magnet classes, this applies to the area under the motor.
- For classes where any form of motor restriction applies (eg: RPM), motor make and model must be identifiable so as to ascertain its eligibility for the class. (Eg: Leave original label/markings on motor.)
- Only one guide is allowed per car. Guide is defined as any part of the car which runs below the track surface in the slot.
Where a class stipulates the USD rule, the car must drop away from a rigid C7016 Scalextric Single Lane Half-straight 175mm (henceforth referred to as the "test block") that is held still in an upside-down position. The test will be done by first ensuring that the braid is flattened against the guide, then placing the car on the block and turning the block upside down horizontally while holding the car in place. The car is then released. Once either the front or rear wheels (or both) drop away from the test block, the car has passed the test. Magnet stacking is allowed.
45º Upside-down Rule definition and execution:
Where a class stipulates the 45º USD rule, everything stated in the standard USD rule above applies except that the car is held in a position 45º as per the following diagram:

Helpful link: Some ways to fine-tune for passing the USD rule
Checking the ground clearance (where applicable):
Ground clearance will be checked with the car held upside down on a clear plastic tech block using a 1mm plastic gauge.
Ground clearance will be checked with the car resting right side up in on a rigid piece of Scalextric sport track with guide flag in the slot and car positioned parallel to the rails. Cars must have an area that allows the gauge to be used for this check.
Items not mentioned in the specific class rules:
For each class, cars need only comply with the applicable General items above and with the items mentioned for the class. Everything else is allowed.