Car Classes & Rules

Car Classes & Rules

We race 5 classes here at Pontyslot:-

  1. 1/32nd Formula 2

  2. 1/32nd Production (Sports cars)

  3. 1/32nd Saloon

  4. 1/24th Production (See calendar for seasonal body shell changes)

  5. 1/24th Group 12

We also run hard bodied Scalextric type cars on the Wednesday after the 1/24th Group 12 class, we clean the track surface beforehand. We also run a rally evening on the Wednesday after the 1/32nd Saloon class using our three portable rally tracks and, time permitting, a rally stage on the Xbox setup. Please see the club calendar for dates.

RULES

British Slot Car Racing Association

1/32 Formula 1

This is BSCRA F2 (Class 1a)

Maximum overall width 68mm

Front tyres Minimum width 4mm Minimum diameter 14mm

Rear tyre Maximum width 16mm (No limit on diameter)

Maximum rear body height 30mm (no limit on ground clearance)

  1. All cars must have a driver securely fixed, and consisting of a minimum of head, shoulders, arms and top segment of the steering wheel joining the hands. None of these items may be just painted on.
  2. The front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black
  3. Motors will be JK & TSR Falcon, Hawk Retro, Hawk 7 & 7BB, Mid America Products Eagle or sealed Proslot 4002FK. (Hawk and Eagle motors must be fitted with the designations/stampings visible from underneath).
  4. Motor Shafts may be shortened.
  5. Chassis is free choice.
  6. Rear body details (e.g. gearbox and diffuser) may be omitted.
  7. No part of the motor, chassis or gears (excluding axles and axle tubes) shall be visible when viewed from above or through the windscreen.
  8. The maximum width of the chassis is 34 mm except for the section no more than 68mm long between the trailing edge of the rearmost front tyre and the leading edge of the rear tyre where the maximum width is 52 mm. This limitation does not apply to scale engine or exhaust detail or suspension detail as found on the prototype. Suspension detail thicker than 1.6 mm rod or wire may result in disqualification. Suspension detail shall be in the correct position and may not be filled in with lead or other weights. Up to 4 body mounting pins will be allowed outside this 52mm limit.
  9. Vacuum formed plastic bodyshells only are permitted and these shall not exceed 1 mm in thickness at any point. No weights may be attached to the body so as to be outside the chassis width limit.
  10. Front Wheels must touch and roll on the track. Front tyres must be black.
  11. Unmodified GMS Devil chassis shall be allowed to race in Formula 1. The chassis width, and guide lead rules shall not apply to this chassis, but all other car standards in Sections A and B of BSCRA rules shall apply.
  12. The section of extra bodywork either side of the nosecone to cover the chassis shall be painted or marked in black or grey.
  13. Cars must carry a clearly legible racing number in at least one APPROPRIATE place

BSCRA Intro 32

Section A Car Standard applicable to Brushed Motor INTRO 32 cars

Chassis Regulations – The 1/32 Genesis chassis is mandatory in this class

A1. The edges of the chassis may be de-burred but must not result in excessive material removal and any such edge radius must not exceed 50% of the sheet material thickness.

A2. Ballast may be added with adhesive to the top side of the chassis only. The ballast must not change the flexibility or movement of the chassis.

Assembly Regulations

A1. The motor shall be fixed in place with 2 screws in the original mounting holes. (Soldering the motor in is not permitted)

A2. The motor mounting screws may be bonded in place.

A3. The pinion gear attached to the motor shall be of the type: 11 teeth, 64d.p, 2mm bore

A4. The spur gear attached to the rear axle shall be of the type: 37 teeth, 64d.p, 16 degree, 3/32” bore

A5. The spur gear shall be secured on the rear axle with a grub screw. A6. Hollow axles are not permitted

A7. The rear axle shall be 3/32” in diameter

A8. A maximum of two plain, concentric axle bushes are permitted.

A9. The axle bushes may be soldered or bonded in place

A10. Lead wires shall be soldered to the motor (maximum of 2 allowed)

A11. Lead wire routing and attachment to the guide is free choice.

A12. Front wheels shall be mounted to the body and shall conform to applicable dimensional requirements

A13. Maximum overall width is 64mm (excluding body pins)

A14. Maximum overall tyre width is 16mm

A15. Guide washers and nuts are free choice.

A16. Axle washers and spacers are free choice.

A17. The spur gear must not protrude below the underside of the chassis.

A18. No modifications or additions to the chassis are allowed unless specified herein.

A19. Hawk and Eagle motors must be installed so that the motor designation/stampings can be read from the underneath of the car.

Permitted Motors

One of the following motors only may be used: JK Hawk Retro : JK Hawk 7 : JK Hawk 7BB : Mid America Eagle part number MID 605: JK and TSR Falcon up to and including Falcon VII / Falcon 7 (see photos on the BSCRA  web site British Slot Car Racing Association)

Motor Regulations

A1. The armature shaft may be shortened at the can end Note: As a guide, the end of the motor shaft, when shortened should protrude approximately 7mm from the flat mounting face of the motor can.

A2. Any evidence of tampering e.g. opening, internal or external modification will deem the motor ineligible. Clarification – the original label must remain in the standard position on the motor

A3. Soldering or bonding in the motor bearings is permitted.

Body Regulations

A1. The body shall be on the BSCRA approved body list (list available on the BSCRA website,

NOTE: the BSP Audi R8 and R10 are not permitted)

A2. Maximum body height is 32.5mm

A3. Where the real car has closed wheel arches the competitor may choose to cut them out or leave them in

A4. The body must be painted in at least 2 different colours. The body may be left unpainted where the front wheel arches would be on the real car. The windscreen and windows must remain transparent as on the real car

A5. Front wheel graphics shall be appropriately positioned on the body.

A6. Front wheel decals must look realistic, including a black tyre and wheel detail.

A7. Front wheels shall be a minimum of 12.7mm in diameter

A8. The rear bodywork may be omitted only where:

  1. The original car did not have rear bodywork.
  2. The wing is the rearmost part of the bodywork.

A9. The body shall carry clearly legible racing numbers in a minimum of two appropriate places.

A10. The body shall contain a 3 dimensional interior consisting of a driver figure with hands, arms, shoulders and head and at least 30% of the top half of the steering wheel

A11. No part of the motor, chassis, gears or tyres shall be visible when viewed from above or through the windscreen or windows

A12. The body must be secured to the chassis using pins in the standard pin tubes. The body may also be attached with adhesive tape

A13. Self-adhesive plastic or fabric tape may be used prevent the chassis shorting the track tape or track braid

A14. Any tape added to the chassis or body, must not restrict chassis movement

Section B Car Standard applicable to Brushless Motor INTRO 32 cars. 

Chassis Regulations

B1 The following chassis are permitted:-

  1. a) BSCRA Genesis Brushless
  2. b) Pre-production versions without the BSCRA Genesis markings
  3. c) Previous BSCRA Brushed Genesis with the motor mounting bracket replaced with a brushless mount which must be fitted in the original motor mounting bracket holes on the chassis The BSCRA Brushed Genesis conversion motor mounting bracket may be modified by removing the top left screw hole to allow the motor to be fitted without removing the pinion

B2 The screw holes in the motor mounting bracket on either chassis may be chamfered, no more than half the thickness of the bracket, to ensure any mounting screws sit flush with the outer face of the bracket when tightened.

B3 The bottom edges of the chassis may be deburred, chamfered or rounded to prevent track damage but must not result in excessive material removal and any such edge radius must not exceed 50% of the sheet material thickness.

B4 Rear axle height when measured from the bottom of the chassis to the top of the axle must be 8.9 mm maximum.

B5 Centre of guide pivot to the rear of the back axle must be 103.0mm maximum.

Motor Regulations

B1 The PARMA 3000kv brushless motor is mandatory in this class.

B2 Motors must not be altered from the manufacturer standard specification other than:

  1. a) The shaft may be cut down in length but not diameter.
  2. b) A spacer may be fitted between the stator mounting bearing and pinion.

B3 Mounting screws are a free choice.

Ecom Board Regulations

B1 The AART/BSCRA Trixie 2.0 board is mandatory in this class.

B2 The Ecom may be attached to the chassis using adhesive tape or a plastic mounting cradle (free choice) but any mounting method must not restrict the standard chassis or body movement.

Gears / Axle / Bushes Regulations

B1 3/32” solid axle.

B2 12 teeth 64dp, 2mm bore pinion.

B3 33 teeth 64dp, straight cut, 3/32″ bore spur gear.

B4 Axle spacers are free choice.

B4 Solid bushes only (rolling contact bearings / ball races are not permitted).

1/32 Production Rules

This is BSCRA “Super Production” (Class 4) but we don’t allow “Wasp” motors.

BSCRA Intro 32 cars are also allowed

Maximum rear body height 32.5mm

Maximum overall width 64mm

Front tyres Minimum width (rotating fronts) 0.7mm

Front tyres Minimum diameter (rotating or Sticker” fronts) 12.7mm

Rear tyre Maximum width 16mm Minimum diameter 15mm

  1. Bodies must have major visible appendages, such as lights, intakes, engine detail, etc. must be shown in their correct positions and colours. Clear plastic bodies shall be painted. (This includes painting the body sides).  Where 3D rotating wheels are used, the wheel arch must be left clear. Moulded in wings must be realistic in appearance (either by black dividing lines, shadow, or contrasting colours).  Any requirements for specific bodies included in the approved body list are mandatory.
  2. All cars must have transparent windscreens and windows as found on the prototype.
  3. All cars must have a driver securely fixed, and consisting of a minimum of head, shoulders, arms and top segment of the steering wheel joining the hands. None of these items may be just painted on.
  4. Cars may use 2 dimensional front wheels as permitted under BSCRA regulations. The 3D front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black
  5. The rear bodywork may be omitted only where:-
  6. a) The original car did not have rear bodywork.     OR
  7. b) The wing is the rearmost part of the bodywork.
  8. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.
  9. No part of the motor, chassis, gears or tyres shall be visible when viewed from above or through the windscreen or windows.
  10. The following chassis only may be used: ‘Eurotoy II’, Parma International 32, GM Demon, TWP “Euro toy”, JK X32 2 piece, CMG Bulldog, JK Laser Cut or BSCRA Genesis
  11. Permitted motors are JK & TSR Falcon, Hawk Retro, Hawk 7 & 7BB, Mid America Products Eagle or sealed Proslot 4002FK.

1/32nd Saloon Rules

This is BSCRA Class 3 – (plus see 7. below)

BSCRA Intro 32 cars are also allowed with BSCRA approved Saloon body

Maximum guide lead (pivot to rear axle) 107mm

Maximum overall width 64mm

Front tyres Minimum width (rotating tyres) 4mm. Minimum diameter (rotating or “sticker” fronts) 12.7mm

Rear tyre Maximum width 16mm Minimum diameter 15mm

Maximum rear body height 30mm

  1. The front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black
  2. Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all road wheels shall be visible from the side to at least wheel centre height. Where 3D rotating wheels are used the front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. The outside edge of 3 dimensional front wheels shall be within 6mm of the outside of the chassis. Alternatively, 2 dimensional front wheels may be fitted to the outside of the body. Front tyres must be black.
  3. The rear bodywork of Saloon bodies (class 3), as fitted to the prototype, must not be omitted. The lower edge of the rear bodywork must not be more than 10 mm above the track across its full width. The Saloon height applies to the rearmost 10mm of the body.  The roof may exceed this height.  BSCRA may permit specific saloon bodies to exceed the rear body height limit, the approved body liststates which bodies may exceed this height limit.
  4. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.
  5. No part of the motor, chassis, gears or tyres shall be visible when viewed from above or through the windscreen or windows.
  6. Chassis is free choice
  7. Motor must be BSCRA spec. Group 12 with single magnets, 0.513 armature. Magnets may be shimmed, honed and notched for axle clearance.

Alternatively JK & TSR Falcon, Hawk Retro, Hawk 7&9, 7&9 BB, Mid America Products Eagle or sealed Proslot 4002FK may be used.

Any brushless 3000KV motor with the Trixie Ecom and 12:33 64Dp gearing (introduced at 2026 AGM).

 

1/24th Production Rules

(BSCRA Class 8 rules but different motors and bodies)

Maximum overall width 83mm

Front tyres minimum diameter (rotating or “sticker” fronts) 12.7mm

Rear tyre Maximum width 21mm

  1. Bodies must have major visible appendages, such as lights, intakes, engine detail, etc. must be shown in their correct positions and colours. Clear plastic bodies shall be painted. (This includes painting the body sides).  Moulded in wings must be realistic in appearance (either by black dividing lines, shadow, or contrasting colours).  Any requirements for specific bodies included in the approved body list are mandatory.
  2. Bodies must be of the correct type for the current Championship. (see Calendar – an approved list will be published each season).

For Winter series working lights – minimum 2 front and 2 (red) rear.

  1. All cars must have transparent windscreens and windows as found on the prototype.
  2. All cars must have a driver securely fixed, and consisting of a minimum of head, shoulders, arms and top segment of the steering wheel joining the hands. None of these items may be just painted on.
  3. Cars may use 2 dimensional front wheels as permitted by BSCRA regulations. The 3D front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black
  4.  Cars must use a BSCRA approved 1/24th Production chassis (see below).
  5.  Rear bearings may be soldered or glued in position.
  6. The rear pillar blocks may be braced by a single U shaped piece of piano wire not exceeding 16swg.
  7. The chassis must use the original steel pans. Aluminium or lightened pans are not permitted.
  8. The guide tab may not be bent to alter the ride height at the front of the chassis.
  9. Guide flag may be cut down.
  10. Lead ballast may be glued or soldered on top of the pans or chassis centre section.
  11. Where solid front wheels are used they must be a minimum diameter of ½”.
  12. Pin tubes may be fitted in the original holes in the pans or soldered vertically above the original mounting positions.
  13. A Parma Hot Wing may be fitted if appropriate to the chassis
  14. Motor must be a Parma Death Star 16D, JK & TSR Falcon, Hawk Retro, Hawk 7&9, 7&9 BB, Mid America Products Eagle or sealed Proslot 4002FK. Motors may be soldered in place and braced with a single piece of piano wire not exceeding 16swg.

Alternatively commercially available brushless motors up to 4500kv may be used unmodified.

  1. The type of body to be run in this class shall be decided at the AGM for a period of 2 years.

1/24 Production – Permitted Motor Modifications.

None of these motors should be modified in any way:- JK & TSR Falcon, Hawk Retro, Hawk 7, 7BB & 9BB, Mid America Products Eagle, sealed Proslot 4002FK, commercially available brushless motors up to 4500kv. Any signs of opening or tampering will render the motor ineligible.

16D type motors: free choice of brushes/brush gear. Brushes may not be shunted.

Bearings must be plain (no ball races)

Armature may be balanced, however, no signs of balancing should be visible when the motor is assembled.

Axles free choice

Gears any type and any ratio.

Rear axle bearings must be plain. No ball races.

Tyres – Free choice.

1/24 Production – BSCRA approved chassis at 01/01/2025 (including “brushless” versions).

Parma Flexi car

Parma Flexi-2

Parma Flexi-3

Parma Flex 4

Trinity Spyder’ (with or without guide loop)

Champion Astro’

‘ Champion Turbo Flex’

‘JK. Cheeta.’ 23

JK X24 2 piece chassis

JK X25 2 piece chassis

JK X21 2 piece chassis

JK C43 Cheetah Aeolos

RJR Storm

Mossetti Titan

Mossetti Titan SS

Mossetti Patriot Striker 2 Piece ALL STEEL chassis part no. MR1002: Patriot “Avenger” chassis with heavy weight steel pans – part number MR3002:

Mossetti Patriot “Avenger X” chassis with heavy weight steel pans – no uprights part number MR 3102

ProSlot SpeedFX (including PS-5000 and PS-5001 SpeedFX C-and D-Can Chassis, PS-5002 and PS-5003. Standard and medium steel pans BUT NOT the aluminium pans (PS5004))

Mid America Gemini – Either a 1.2mm diameter unmodified Mid America “T bar” or a 0.8 mm diameter unmodified Mid America “T bar” and sleeve tube must be used to join the chassis parts by passing through the holes intended for that purpose. There are two versions – plated and unplated, both are approved for racing

Mossetti “Patriot Avenger Air” chassis, part number MR- 3203 with Heavy Plus steel pans, (it is only be eligible in that configuration).

NOTE The 4 ½  inch wheelbase versions of chassis are not eligible.

Versions of these chassis with light alloy pans are not permitted

1/24th Open Group12 Rules

This is BSCRA Open Group 12 (Class 6)

Plus Club 1/24th Production cars with BSCRA OG12 approved bodies. (Introduced 2026 AGM).

Maximum overall length 200mm

Maximum overall width 83mm

Front tyres minimum diameter (rotating or “sticker” fronts) 12.7mm

Rear tyre Maximum width 21mm (No limit on diameter)

Maximum rear body height 38mm

Minimum rear ground clearance 0.5mm

  1. Bodies must have major visible appendages, such as lights, intakes, engine detail, etc. must be shown in their correct positions and colours. Clear plastic bodies shall be painted. (This includes painting the body sides).  Moulded in wings must be realistic in appearance (either by black dividing lines, shadow, or contrasting colours).  Any requirements for specific bodies included in the approved body list are mandatory.
  2. All cars must have transparent windscreens and windows as found on the prototype.
  3. All cars must have a driver securely fixed, and consisting of a minimum of head, shoulders, arms and top segment of the steering wheel joining the hands. None of these items may be just painted on.
  4. The front wheels of all cars must make a minimum angle of 85 degrees with the track.  One-piece wheels and tyres shall have the appropriate part black. 2 dimensional wheels may be used at the front.
  5. Where the prototype has closed wheel arches the competitor may choose to cut them out or leave them in.  In all other cars all road wheels shall be visible from the side to at least wheel centre height. The front wheel arches need not be cut out provided they are left unpainted and the wheels are visible from the side. All 3D road wheels shall rotate. The outside edge of 3 dimensional front wheels shall be within 6mm of the outside of the chassis.
  6. The rear bodywork may be omitted
  7. The body must be painted in at least 2 different colours
  8. Cars must carry clearly legible racing numbers in at least two APPROPRIATE places.
  9. No part of the motor, chassis, gears or tyres shall be visible when viewed from above or through the windscreen or windows.
  10. Gears are free, but they must not protrude below the underside of the chassis.
  11. Free Choice of Chassis.
  12. Bodies as allowed in BSCRA 1/24thOpen Group 12
  13. Motors must be as per BSCRA Open Group 12 specifications. Magnets may be shimmed, honed and notched for axle clearance.

Plus, Hawk 9 & 9BB motors (Approved 2026 AGM).