10. Inter
9.5. Having moved into the ASN Inter or Junior Category a Driver cannot revert to the ASN Cadet Category.
10.1. Category for 10-13 year-olds. A Driver may enter the Inter Category from their 10th birthday or the calendar year of their 10th birthday with a Kart National Licence, and continue until the 31st December of the year of their 13th birthday.
10.2. The minimum Driver weight and height and the class weight will be defined in the Class Regulations. All restrictions will be within the parameters of the current Kart Class Homologation or Re-Homologation Regulations.
10.3. Having moved into the ASN Junior Category a Competitor cannot revert to the ASN Inter Category.
11. Junior
11.1. Category for 12 to 16 year-olds. A Driver may enter the Junior Category from the calendar year of their 13th birthday or from their 12th birthday with a Kart National Licence and continue until 31st December in the year of their 16th birthday. Drivers cannot compete in Gearbox Karts until their 13th birthday( subject to individual Class Regulations).
11.2. Having moved into the ASN Senior Category a Driver cannot revert to the ASN Junior Category.
11.3. A minimum Driver weight is required in the Junior Category. This weight will be defined in Class Regulations and must be within the parameters of the current Kart Class Homologation or Re- Homologation Regulations.
12. Senior
12.1. A Driver may enter the Senior Category from the calendar year of their 16th birthday or from their 15th birthday with a National Licence. A minimum Driver weight is required for any Driver below the age of 16 competing in a Senior Category except for International ITE Licence holders. This weight is defined in individual Class Regulations.
13. CIK Classes
13.1. For only CIK-FIA Classes the ASN may authorise variations to the ages above subject to further limitations as per Class Regulations.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18- Karting 645