5.10. Tyre bead retention pegs are permitted in all classes.
5.11. For Race Venue Events all wheels must be fitted with some form of bead retention inside and outside. Bead retention as a minimum is defined as a wheel with a minimum of a 0.5mm raised lip on the inner edges of the tyre housing.
5.12. For all gearbox Karts both rear outer rims must in all cases incorporate additional bead retention comprising three pegs at equidistant positions. Applicable to wet and dry tyres.
6. Tyres 6.1. When inflated on the wheel rims tyres must not exceed the following maximum external diameters:
a. b. c.
Bambino / Cadet / Inter: front 260mm and rear 290mm Superkart: front and rear 350mm All others: front 280mm and rear 300mm 6.2. Minimum external diameter must not be less than 222mm. 6.3. Tyres for all Classes must be as detailed in the Class Regulations.
6.4. All tyres designated for a specific Class must be identical in specification to the samples that have been tested and selected. Control tyres may be held by the ASN as a reference in the event of any dispute.
6.5. Tyres must be freely available as single units to the open market in the UK so that customers are not forced to buy either complete sets or other equipment in order to purchase a particular tyre.
6.6. To qualify as a wet tyre tyres must be moulded in such a way as to ensure that grooves are created to leave a minimum of 60 % and a maximum of 85 % of the total surface area as a raised tread pattern. The grooves must have a minimum depth of 2mm at race start.
6.7. Hand cutting of all tyres is prohibited. 6.8. Remoulded tyres are prohibited.
6.9. Heating of tyres by any method or their treatment by any chemical substance is prohibited. For the avoidance of doubt no manner of abnormally raising the temperature of the tyres / wheels above the natural ambient temperature is allowed.
6.10. Any Competitor found to be using chemical treatment on tyres in contravention of Regulations( Art. 6.9 above), may in addition to any other penalty be referred to the ASN for further action( Ch. 8 App. 3 Art. 7.2).
6.11. Mechanical removal of accumulated rubber debris is permitted.
6.12. The interior of the tyre( space between the rim and the internal part of the tyre) must be filled only with air or nitrogen.
6.13. For all gearbox Karts valve caps must be fitted to all valves at the start of each race or Practice session.
7. Brakes
7.1. Non-gearbox Karts must have effective brakes acting on the rear wheels only unless specified in Class Regulations.
7.2. Gearbox Karts must have brakes operating on all four wheels with independent front and rear systems which must be hydraulic. Should one of the systems fail the other must guarantee braking on two front or rear wheels.
7.3. Master cylinders must be fitted in a position safe from impact at least 150mm behind the front bumper or to the rear of the pedals.
7.4. Hydraulic pipes must be securely fitted to the Chassis Frame upper sides and be protected against damage.
7.5. All Karts must have an effective dual connection between the brake pedal and caliper if mechanical and
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 669