Maximum external diameter( mm) |
Minimum thickness( mm) |
50 |
1.9 |
49 |
2.0 |
48 |
2.0 |
47 |
2.1 |
46 |
2.2 |
45 |
2.3 |
44 |
2.4 |
43 |
2.5 |
42 |
2.6 |
41 |
2.8 |
40 |
2.9 |
39 |
3.1 |
38 |
3.2 |
37 |
3.4 |
36 |
3.6 |
35 |
3.8 |
34 |
4.0 |
33 |
4.2 |
32 |
4.4 |
31 |
4.7 |
30 |
4.9 |
29 |
5.2 |
≤28 |
Solid Axle |
35.8. The drive must always be to the rear wheels only. 35.9. Any method may be used provided no differential is incorporated.
35.10. All methods of chain oiling and greasing whilst the Kart is in motion are forbidden unless specifically permitted in the Official Documents.
35.11. Sprocket protectors are permitted in all Classes but must not be metallic.
35.12. Effective protection must be provided over the top and both sides of the exposed transmission chain( or belt) and sprockets and extend to at least the lower plane of the rear axle.
35.13. Access for the starter is permitted. 35.14. Clutches on non-gearbox Karts must be covered preferably by metal guards. 35.15. Non-gearbox Karts must use a 219 pitch chain only.
35.16. For Race Venue Events all rear axles must be fitted with a circlip – or a similarly effective hub retaining device – on each end of the axle.
36. Cameras
36.1. Where used cameras must be attached securely to the Kart and be approved by the Chief Scrutineer and Event Organiser. The weight of the camera including any additional casing( excluding any additional mounting and associated fixing) must not exceed 200g
36.2. The images captured by the camera must not be deleted before 30 minutes following the conclusion of the last race at the Event and must be surrendered to an Official of the Event on demand.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 682