d. Have a front overhang of maximum 350mm. e.
f.
g.
Have the lower bar straight and with a width of 150mm minimum in relation to the longitudinal axis of the Kart.
Have the attachments of the lower bar parallel( in both horizontal and vertical planes) to the axis of the Chassis Frame; they must be 155mm minimum apart but are recommended to be a minimum of 220mm apart as mandated by CIK-FIA Superkart regulations and centred in relation to the longitudinal axis of the Kart at a height of 60mm ± 20mm from the ground.
Have the upper bar straight and with a width of 250mm minimum in relation to the longitudinal axis of the Kart.
h. Have the upper bar 170mm minimum and 220mm maximum above the ground. i.
Have the upper bar attachments 500mm ± 50mm apart and centred in relation to the longitudinal axis of the Kart.
j. Have the attachments of the upper bar and the lower bar welded to the Chassis Frame. k.
At no time have its upper element exceeding the height of the foot pedals with the pedals in the relaxed position.
25. Rear Bumper 25.1. The rear bumper must:
a.
b.
c.
d.
Be constructed of magnetic Steel tubing with a minimum outside diameter of 18mm and a minimum wall thickness of 1.5mm.
Consist of a minimum of two horizontal and parallel tubes with outer extensions forming a closed loop with a minimum radius of 2.5 times the tube outside diameter with two vertical link tubes to the Chassis Frame anchorage points( as per App. 9 Drawing 3 Diagram 2).
Have a maximum vertical gap between any two horizontal elements not exceeding 95mm except that maximum dimension may be exceeded provided that there is at least one element – minimum outside diameter of 18mm and minimum wall thickness of 1.5mm – fitted approximately centrally and vertically as seen from the rear either permanently fixed or clamped between these horizontal elements.
Have its upper tube and uppermost extension element between 220mm and 280mm above the ground and be a minimum of 1100mm in length and a maximum of the overall Kart width.
e. Have its upper tube and extension loops made of a single piece of tubing. f.
Have its lower tube fixed horizontally between the main uprights or the end of the Chassis Frame main tubes between 40mm and 90mm above the ground in dry configuration be straight and a minimum of 600mm in length. If the Kart is fitted with a rear diffuser with a minimum of four vertical strakes not more than 20mm from the bumper the minimum height of the lower element must be between 75mm and 165mm. Alternatively for Race Venue Events only the lower tube must be between 100mm and 140mm above the ground in dry configuration be straight and a minimum of 600mm in length.
g. Inside have a rearward rake of between 0 and 45 degrees to the vertical( App. 9 Drawing 3 Diagram 2). h.
i.
In the case where a vertical bumper is fitted have the extension loops strengthened by triangulated Steel braces to the Chassis Frame to reduce folding in onto the rear tyre.
Have an overall width not exceeding the rear width of the Kart at any time( measured outside the rear wheels or tyres whichever is the greater).
j. Cover at least 50 % of each rear wheel / tyre at all times. k. Have any attachment fasteners made of high tensile Steel. l.
Not be an alternative design / material or an adjustable width bumper except with specific written approval from the ASN.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 676