between the pedal and master cylinder if hydraulic.
7.6. Where there is a dual linkage between master cylinders the mandatory requirement for a secondary dual connection is waived.
7.7. The prime connection may be either solid or cable operated with a secondary safety cable set slightly looser to act as a back up in case of failure.
7.8. Drum brakes are not permitted. 7.9. Brake discs must be made from ferrous material. 7.10. When a cable is used a minimum thickness of 1.8mm is mandatory.
7.11. If the brake disc protrudes below or is level with the main Chassis Frame tube nearest to the ground then an efficient rear brake disc protective pad( in Teflon, Nylon, carbon fibre, Kevlar or Rilsan) is mandatory in all Categories( except Gearbox Classes unless specified in Class Regulations). This protection must be placed laterally in relation to the disc in the longitudinal axis of the Chassis Frame or under the disc. It must be located within 120mm of the centreline of the brake disc.
8. Steering
8.1. The Kart must be controlled by a steering wheel with a continuous rim not incorporating any reflex angles in its basic shape.
8.2. The upper and lower one third of the circumference may be straight or of a different radius to the rest of the wheel.
8.3. Any device mounted on the steering wheel must not protrude by more than 20mm from the plane forward of the steering wheel( see App. 9 Drawing 11) and must not have sharp edges.
8.4. It is recommended that the minimum diameter for a steering wheel is not less than 300mm across its widest section.
8.5. Steering wheels with flat handgrips are acceptable. 8.6. Flexible steering controls by cable or chain are prohibited.
8.7. All parts of the steering must have a method of attachment offering maximum safety( split pins, self-locking nuts or burred bolts).
8.8. The fitting of a steering lock is not permitted when the Kart is being driven.
8.9. The steering column must have a minimum diameter of 18mm and a minimum wall thickness of 1.8mm. It must be a hollow tube and be constructed from magnetic Steel.
8.10. All Karts must have the steering column mounted in such a way that even if the bottom retaining fastening is removed it cannot pull free from its lower bearing.
9. Stub Axles 9.1. The use of chromium-plated stub axle assemblies is not permitted for any 250cc Gearbox Classes.
10. Seating 10.1. It is recommended that the seat be made of a fire-retardant material.
10.2. The seat must be rigidly located on the Chassis Frame and designed to securely locate the Driver without movement relative to the Chassis Frame when cornering or braking.
10.3. It is mandatory that all seats comprise metal or nylon reinforcement at all the anchorage points between the seat supports any additional seat stays and the seat.
10.4. Reinforcements must have a minimum thickness of 1.5mm and a minimum surface area of 130mm2 or a minimum diameter of 40mm.
10.5. All supports must be bolted or welded at each end.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 670