Main dimensions

Illustration of where dimensions are measured from

Dimension		limit
Guide lead NOTE Guide lead is the horizontal distance from the centre of the rear axle to the centre of the guide pivot	a	max
Overall length	b	max
Overall width (see v)	c	max.
Front tyre diameter	d	min.
Front tyre width	e	min.
Rear tyre diameter NOTE Minimum tyre diameters apply at the start of each race	f	min.
Tyre width	g	max
Ground Clearance	h	min
Height at rear	i	max.
Guide blade length	j	max
Height of lower edge of rear bodywork	o	max
Length from rear over which maximum body height applies NOTE The roof may exceed this height. BSCRA may permit specific saloon bodies to exceed the rear body height limit.	p	min
Height from track surface to top of the vertical part of the molded front wheel arch. NOTE Applies to 1/24 saloon only. Cars must meet either q or r, they don't need to meet both	q	min
Height from track surface to the centre of the bonnet over the front wheel centre line. NOTE Applies to 1/24 saloon only. Cars must meet either q or r, they don't need to meet both	r	min

NOTES

i) The tables at the start of each section of the car standards show what limit apply to each class. These diagrams are intended to clarify the rules written in the car standards, the car standards take precedence.

ii) Dimensions k, l, m and n are used in the body approval process - competitors and scrutineers need not measure these dimensions.

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