Hot Rod Construction Rules

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Effective from 10th February 2025

Current BMCC Hot Rod construction rules are essentially the same as 1300 Stock Car rules with the only difference being to the body shell and bumpers. This is intended to make it very easy to switch between classes.

  1. Body;
    1. Made from Lexan only and a reasonable representation of a full size Hot Rod.
    2. Spoilers are allowed.
    3. Windows must be clear.
  2. Chassis;
    1. Must consist of one continuous sheet of aluminium or glass-fibre reinforced plastic only.
    2. Chassis must extend from a minimum 10mm ahead of the front axle line and runs continuously along the car to end a minimum of 25mm behind the rear axle line.
    3. Winged style chassis is permitted provided it is commercially available in a kit (i.e. Kamtec/Mardave).
    4. Chassis must not have any extra holes drilled or added to allow extra ‘flex’ in the chassis component.
    5. The chassis must be a solid design, not slotted to achieve extra movement.
    6. Additional holes may be drilled for the re-mounting of the body post and aerial mast locations only.
  3. Rear Pod;
    1. Mardave/Kamtec type rear pod base plate, pivot ball and standard V12 spring location, or equivalent parts in shape and construction and mounting locations.
    2. 2 rear springs only.
    3. Alloy pods are permitted.
    4. Height adjustable rear pods are not permitted.
  4. Suspension;
    1. Damper tubes are not allowed.
    2. Oil filled shocks and dampers are not allowed.
    3. Front suspension may be independent provided that the suspension design does not have any pivot, rod or other mechanism that alters the wheel camber or castor in roll relative to the chassis during its full travel, and must use the standard two bolt fixing, and not be modified/elongated.
  5. Steering;
    1. Standard Mardave/Kamtec A-arm style front wishbones only. To be made of plastic only, no alloy.
    2. No Zen, Schumacher, Rsgt, Rxgt, Atom, Venom style parts are to be used (GT12 parts not eligible).
    3. Steering servo maximum RRP of £50. Low profile servos are permitted providing they do not exceed the RRP limit.
    4. No trailing-arm style hubs allowed. The centre of the front axle must pivot around the kingpin.
  6. Bumpers;
    1. Internal front and rear bumpers are allowed.
    2. Bumpers must be foam and fitted inside the body shell only.
  7. Rolling Chassis;
    1. Overall maximum width of the rolling chassis to be 160mm (178mm including body and bumpers).
    2. Wheelbase of 205mm +/-5mm only.
    3. Materials used in the rolling chassis may only be steel, brass or aluminium. Special materials (such as titanium or carbon) are not allowed.
    4. Brass and lead only may be used as identifiable weights.
    5. All added weights must be bolted to the chassis with a nut and bolt.
    6. Ride height/castor can be adjusted with shims/washers.
    7. Shims and washers must be made from a solid substance to be a consistent thickness start to finish and rigid.
    8. No wedge-shaped spacers or ‘o’-rings are to be used on any chassis mounting points.
    9. Minimum ride height of 3mm.
  8. Tyres;
    1. Min 25mm, max 26mm width and max 60mm diameter.
    2. No min diameter of tyres, but the tyre must cover the entire wheel edge to edge.
    3. Tyre additives are NOT allowed.
  9. Drivetrain;
    1. Diffs are not permitted.
    2. Gearing is limited to 32dp for pinion and spur gear.
    3. Z-drive style hubs are allowed.
    4. Rolling element (ball) bearings are allowed on the front and rear axles.
    5. Any 12th scale single bolt wheel to be used, mounted onto a steel axle only.
  10. Electronics;
    1. Powered by 4-cell NiMH battery and brushed motor only.
    2. Cell layout is free and open for driver’s choice.
    3. Motors permitted include the Kamtec K21 and Schumacher Core 21.
    4. Speed controller maximum RRP of £60 and must be commercially available.
    5. Electronic speed controller or mechanical resistor type speed controller permitted.
  11. All cars must be commercially available to buy;
    1. Parts from other manufacturers may be used as long as they serve the same purpose as the part they are replacing.
    2. No GT12 hybrid style cars to be used.
    3. Anyone wishing to manufacture a car must go through the process of testing and development at their regular club, with the clubs agreement. If they wish to then race the car at BMCC they must be able to make units available to purchase by other racers. It must comply with the above construction rules if being sold to race, and must be of a comparable price to those being sold by other manufacturers and not overly priced to limit availability.
    4. Anyone wishing to develop or modify a car that does not comply with current BMCC construction rules must ask the BMCC committee for permission to test at a race meeting.
    5. Any changes to the construction rules that allow new designs to race would need to be approved by the BMCC committee.
    6. Championship points will not be awarded if the car does not meet current construction rules, and you will only be able to participate in the lowest final. You will not be able to ‘bump-up’ to the next final.
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