Ministox

1. Cars may use any make of clear Lexan Austin/Morris/BL Mini shells (NO ABS).
2. No convertibles or pick-ups can be run.
3. Body shell Kit supplied wings/spoilers are allowed, but must be to the following dimensions.
   • 160mm wide (max).
   • 35mm depth +/- 3mm.
   • 25mm side height +/- 2mm.
   • 15mm max height from the top of the shell.
4. Windows must be clear, no tint or blackout.
5. Headlamps and grills must be defined. Lights are not to be used on the car.
6. Shells must have no sharp edges that could cause harm to other racers/marshals or damage to the carpet.
7. Shells must run a minimum clearance of 4mm.
8. Body and chassis must be securely joined at all times while the car is on the track.
9. The wheel rim diameter (not the tyre) maximum is 40mm, and 26mm width.
10. Wheels must be fixed using a single fixing.
11. Only MR33 V5 tyre treatments are permitted.
12. Wheel nuts and/or axles must not protrude more than 2.0mm beyond the outer edge of the wheels. No more than 1.5mm of the wheel outer side may be exposed (not covered with foam) on the outer edge of wheels.
13. Rigid bumpers made from non-resilient materials such as metal are not allowed. Other sheet materials should be no thinner than 1.5mm; anyone found to be repeatedly damaging the track markings or other racers’ cars due to running big bumpers will be asked to change to a softer construction of bumper.
14. The minimum ground clearance of the car, excluding the spur gear, is 4mm.

Any 25.5 turn or higher brushless fixed-timing, sensored motor. Motors must be readily available.

Recommended

• Hobbywing G2.1 25.5 FTM
• BattCave IMPOST3R 30.5T fixed timing brushless motor
• Surpass Rocket Supersonic 25.5 FTM

Brushless ESC

The following types shall be used:

• XR10 JUST STOCK Zero Timing (HW3011200)
• XR10 JUST STOCK G3 (HW30112003)
• XR10 JUST STOCK G3s (HW30112005)
• Surpass Supersonic ESC
• Team Powers XPS Sport V4BT (TPR-XPS/Sport-V4BT-2S-EXT)

Other ESCs need to be submitted to the club for review; they must meet the following criteria:

• Can be run in Blinky mode only
• £75 max limit

• Mardave G2 F20 (#G2 F20)*
• Core 21 Silver Can (#CR711)* 
• Etronix Sport 540 Tuned Stock 20T (ET0320)*

These cannot be tampered with in any way. Motors may be water bathed. Motor additives are allowed. Motor Spacers can be used.

Brushed ESC

Any commercially available brushed speed controller with a list price of less than £60.

*to be used with 4-cell Sub-C Metal Hydride battery pack. 

For the 2025 session, gearing is now open (pinion and spur) but restricted to 32dp.

Commercially available foam tyres of suitable type, such as Contact, JFT, and Mardave / Kamtec, are to be used.

Only MR33 V5 Carpet Additive may be used.

• The main chassis component will consist of one continuous sheet of material. It can be either fibreglass, carbon, or aluminium.
• The overall maximum width of the rolling chassis is to be 165mm. 7.3 Wheelbase is to be 176mm +/- 3mm.
• Chassis components must be commercially available.
• The chassis bottom must be flat with no protruding fixings.
• No modifications are allowed to the chassis, but edges may be smoothed, sanded, or sealed.
• 2 springs may be fitted on the front end, and up to 3 springs may be fitted to the rear.
• A solid axle must be used. No differential.
• Rolling element (ball) bearings are allowed on the front and rear axles.

All cars must maintain a ground clearance of 4mm; no screw or fitting should protrude below the bottom of the chassis.

Ground clearance is defined as follows: The club’s 4mm gauge should be able to pass under the car from front to rear and from side to side when the car is standing in race-ready condition without the car moving.

Any movement of the car, either laterally or vertically, will be deemed a failure.

Cars must weigh a minimum of 840 grams (including personal transponder, excluding handout transponder), ready to race, including bodyshell.

For use with brushless motors:

Any commercially available 2S Lipo. Solid cased racing packs only (soft cased model aircraft packs not permitted on safety grounds).

LiPo must be in a hard casing; refer to the SRCC general rules for further information on safe usage and maximum cell voltage.

For use with brushed motors:

A 4-cell Sub-C Metal Hydride battery pack may be used in “stick” or “saddle” format. These must be readily available to purchase. Batteries may be wrapped, but the club can ask for the wrapping to be removed for inspection if required.

Any commercially available RC equipment functioning on the 27 MHz, 40 MHz or 2.4 GHz bands is acceptable.

Any commercially available servo with a list price of less than £50 shall be used.