8. Brakes
8.1. Brakes may be modified but an effective handbrake is obligatory. The handbrake may be modified for fly-off operation.
8.2. There must be at least two hydraulic systems so that if one fails braking is maintained on at least two wheels( not on the same side).
8.3. The braking system on all Vehicles must work without impairing the Driver’ s control when tested immediately prior to an Event. It must be possible under all conditions, running or stationary, for 25 % minimum braking effort to be applied by the Driver through the braking system to each axle.
8.4. Brake balance adjusters must not be capable of adjustment during running if they contravene Art. 8.3 above.
8.5. Anti-lock devices are prohibited but brake discs are free subject to being made of ferrous material.
9. Wheels
9.1. At the start of each Session must be fitted with mudflaps behind all four wheels extending to a minimum of 38mm either side of the tyre tread and to a maximum of 76mm above the ground.
9.2. All nuts securing roadwheels( except centre-lock types) must be made of steel and in thread contact over a minimum length of 1 1 / 2bolt / stud diameters.
9.3. Extended or composite wheel bolts / studs are prohibited. The use of safety wheel nuts to prevent wheels pulling over standard nuts is strongly recommended.
9.4. Maximum wheel width on all Vehicles is 250mm( wheel width = flange + rim + tyre).
10. Silencing 10.1. Vehicles must comply with silencing levels in Ch. 7 App. 8 Art. 2.
11. Safety
11.1. Closed Vehicles must have a means of access on either side of the Passenger compartment which can be operated from inside or outside. Access must be sufficient to remove an occupant without interference from any door locking devices. They must have an operating windscreen wiper and washer system.
11.2. Vehicles must comply with safety criteria in:
a.
b.
Ch. 7 App. 3 Arts. 22 – 23, Ch. 7 App. 13 Diagrams 14, 15 or 17 with door bars as shown in Diagram 18 mandatory.
With the exception of Lotus Elise / Exige derivatives and Vauxhall VX220 the door bars on the driver ' s side must be in accordance with Ch. 7 App. 13 Diagram 21. g, 21. h or 21. j.
12. Miscellaneous
c. Harness: Ch. 7 App. 7 Art. 9 as a minimum. d. Fire extinguisher: Ch. 7 App. 6 Arts. 1 and 3 minimum. e. Ch. 7 App. 5 Art. 6 f. Ch. 7 App. 5 Art. 5 g. Ch. 7 App. 7 Art. 4
12.1. The following parts of Ch. 7 remain unmodified: Chassis, Suspension, Steering, Cooling, Weight / Ballast, Exhausts.
12.2. Active suspension, and any system which allows control of the spring flexibility, shock absorption or trim height when the car is moving, is prohibited unless fitted by the manufacturer to that body style.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 16 Part B( Rallycross) Appendix 10- Technical Regulations 594