SECTION 4 - CHASSIS RULES
General Speedway Chassis Specifications (Sprint and Champ)
|
| 4.1 |
Tires |
|
| 4.1.1 |
Pavement: Burris SS44 or SS55 in
all classes. |
| 4.1.2 |
Dirt: Any Burris Tire in all sprint
classes. SS44 or SS55 in Champ classes. |
|
| 4.2 |
Wheels 6” diameter by 10 3/8” maximum
width. (5” diameter local option) |
| 4.3 |
Main frame members shall be constructed
of cold rolled, electric weld, round, steel
tubing or other material of equal or greater
strength, of one inch minimum nominal
outside diameter and .078 inch minimum wall
thickness and 1.400 inch maximum
nominal diameter. Tubing of 1.125 inch nominal
and greater may have a wall thickness
of .060-inch minimum. Main frame rail members
shall be no higher than a horizontal
line extending from the centerline of the
front wheel to the centerline of the rear wheel.
No oval tubing allowed. |
|
| 4.3.1 |
Rear axles to be constructed of
ferrous metal or aluminum (No titanium). 1 3/8”
maximum diameter. Both drive wheels
must be secured to the axle and cannot
rotate independent of each other.
|
| 4.3.2 |
The use of any type of suspension
components is strictly prohibited. |
| 4.3.3 |
Brakes: Hydraulic disc types that
brake the rear wheels only. Steel or iron rotors
only. All bolts and fasteners to be
safety wired or cotter keyed. |
| 4.3.4 |
Brake rotor cover: A flat metal
disc cover (“Wolf plate”) between the seat and brake
rotor is recommended. |
| 4.3.5 |
Steering: |
| |
| 4.3.5.1 |
Solid steering shafts shall
be a minimum .625” diameter, made of cold rolled
steel, and one-piece design.
Welding the steering wheel or hub to the shaft
is not allowed. Shaft extensions,
and cutting and welding the shaft to alter its
length is not allowed. The steering
wheel must be secured to the shaft with
a nut or cap screw in the axial
position. Quick release type steering wheel
mandatory on all Champs and is
optional on sprint chassis. Tiller, vertical
shaft steering systems are not
allowed. |
| 4.3.5.2 |
All steering component bolts,
and nuts, must be cotter keyed and/or safety
wired and must be a minimum grade
5 rating. |
| 4.3.5.3 |
Steering wheels may be circular,
with a ten-inch minimum diameter, and a
minimum of three spokes.
|
| 4.3.5.4 |
Steering wheels may be of
the butterfly type, with a ten-inch minimum
diameter, and four spokes, and
a minimum grip length of five inches on each
side. |
|
| 4.3.6 |
Fasteners used on any component
that will enable adjustment of camber, caster,
etc. must be cotter keyed and/or safety
wired. |
| 4.3.7 |
All weights added to the kart must
be securely fastened to the kart with a minimum
5/16-inch diameter bolt. Any single
weight weighing in excess of seven pounds
must utilize a minimum of two 5/16-inch
minimum diameter bolts. All bolts used to
fasten weights to the kart must be
cotter keyed, safety wired, or double nutted. |
| |
| 4.3.7.1 |
All weights attached to karts
must be painted white. It is also recommend
that your kart number be on the
weight. |
|
| 4.3.8 |
Rear view mirrors are prohibited.
|
|
| 4.4 |
Speedway Sprint Chassis specifications
|
|
| 4.4.1 |
Wheelbase: 43.0 inches maximum,
40.0 inches minimum. Wheelbase is measured
from true axle centerlines, each side.
|
| 4.4.2 |
Track width: 28.0 inches minimum.
Track width may be measured from the outside
edge of one tire to the inside edge
of the opposite tire when both tires are of identical
width. |
| 4.4.3 |
Overall width: 50.0 inches maximum
for all classes. Overall width is measured at
any cross section of the kart, perpendicular
to the longitudinal centerline axis. |
| 4.4.4 |
Overall length: 74.0 inches maximum.
Overall length is measured at any cross
section of the kart, parallel to the
longitudinal centerline axis. |
| 4.4.5 |
Overall height: 26.0 inches maximum.
Overall height is measured such that all
elements of the kart must pass under
a bar set parallel to ground level, 26.0 inches
above ground level. |
| 4.4.6 |
Dry kart weight: 85 pounds minimum
in race ready trim without fuel. |
| 4.4.7 |
Front bumper: All components shall
be constructed of round, .065 wall steel tubing
of .750-inch nominal diameter minimum.
The uppermost tangent point of the top
hoop shall be 7.75 inches minimum from
ground level. |
| 4.4.8 |
Rear bumper: All components shall
be constructed of round, .065 wall steel tubing
of .750-inch nominal diameter minimum.
The uppermost point of the top hoop shall
be 7.5 inches maximum from ground level
and no lower than the bottom of the rear
axle. Minimum width shall be no less
than the lateral distance between the main
chassis frame rails as measured at
the rear of the kart. Maximum width shall be no
wider than the rear overall width of
tires. |
| 4.4.9 |
Nerf bars: All components shall
be constructed round, .065 wall steel tubing of .750-
inch nominal diameter minimum. The
rear portion shall not extend laterally beyond
the rear tire and must be a minimum
of 24” long. |
| 4.4.10 |
Seat: Must be of conventional, unaltered,
bucket type, molded construction,
designed to keep the driver’s posterior
in place without undue movement. The seat
shall be mounted between the main frame
rails. The rearmost point on the seat may
not extend beyond the back of the rear
axle. Headrests are not permitted (expect in
Champ Karts). Steering uprights shall
be positioned in such a manner as to prevent
the driver’s posterior from being positioned
forward of the bucket portion of the seat. |
| |
| 4.4.10.1 |
Height of the uppermost point
of the seat backrest is 10.0 inches minimum
from ground level for Jr. l and
Jr. ll classes |
| 4.4.10.2 |
Height of the uppermost point
of the seat backrest is 12.0 inches minimum
from ground level for Jr. lll
classes |
| 4.4.10.3 |
Height of the uppermost point
of the seat backrest is 14.0 inches minimum for
senior classes. |
|
|
| 4.5 |
Speedway Racing Bodywork Requirements
|
|
| 4.5.1 |
All bodywork components must be
constructed of high strength plastic, fiberglass, or
advanced composites. No metallic materials
to be used for side panels or nose
cones. |
| 4.5.2 |
No component of the bodywork may
be adjusted or controlled in any way while the
kart is in motion. |
| 4.5.3 |
Skirting devices must be constructed
of a flexible, non-metallic material. |
| 4.5.4 |
The sides of the tires may not be
covered in any way by the nose cone or side
panels. It must be possible to remove
the wheel straight through the opening in the
bodywork. |
| 4.5.5 |
Nose cones: The nose cone may cover
the driver’s foot area, but not to extend
further than 3.0 inches rear of the
pedals in relaxed position. This measurement
shall be made directly over each of
the two pedals. The bottom of nose cone may
extend full width no farther than the
rear of the front tires, in a straight-ahead
position, beyond that the bottom of
the nose cone must be within the main frame
rails. The nose cone may be no narrower
than to expose one half of a tire width per
side. Maximum nose cone height 14.0
inches for Jr. Sportsman classes only. |
| 4.5.6 |
A connecting strip from nose cone
or floor to steering fairing is allowed up to 6.0
inches maximum chord width, so as not
to cover the driver’s feet, or legs. Minimum
six-inch clearance from connecting
strip or steering fairing to any other bodywork
component begins three inches maximum
aft of the pedals, extending rearward to
the mounting point for the steering
wheel. |
| 4.5.7 |
Steering fairings: Chord length
14.0 inches maximum. Chord width 14.0 inches
maximum. Clearance to steering wheel
3.0 inches minimum. Clearance to any
other bodywork or fuel tank 6.0 inches
minimum. Clearance from steering wheel to
any other bodywork 6.0 inches minimum.
No steering fairings in Jr. Sportsman
Classes. |
| 4.5.8 |
Belly pans: Full width belly pans
within the main frame rails are allowed for all
classes. Belly pans can be bent up
to a point no higher than the centerline of the
rear axle. |
| 4.5.9 |
Height from ground level of all
side panels and rear pods: 16.0 inches maximum. |
| 4.5.10 |
No bodywork component may extend
past the rear tire. |
| |
|
|
| 4.6 |
Senior/Junior Champ Kart Chassis
|
|
| 4.6.1 |
Main frame members shall be constructed
of cold rolled, electric weld, round steel
tubing or other material of equal or
greater strength, of 1.125-inch nominal minimum
diameter, .083 inch wall thickness.
Conventional tubular space frame construction
methods only are allowed. (No bolt
on cages) Pre 2002 model Champ Karts
accepted providing they are in their
original manufactured configuration. No
modifications to the chassis or cage
allowed. Legality of non-conforming karts to be
determined by the Race Director. |
| 4.6.2 |
Wheelbase: 42.0 inches minimum,
45.0 inches maximum. Wheelbase is measured
on true axle centerline, each side.
|
| 4.6.3 |
Overall width: 40.0 inches minimum,
52.0 inches maximum. Overall width is
measured at any cross section of the
kart, perpendicular to the longitudinal
centerline axis. |
| 4.6.4 |
Overall length: 95.0 inches maximum.
Overall length is measured at any cross
section of the kart, parallel to the
longitudinal centerline. |
| 4.6.5 |
Roll cage specific specifications
|
| |
| 4.6.5.1 |
Full roll cage of four point
conventional construction is mandatory. The four
uprights and top horizontal connecting
tubes must be constructed of 1.125-
inch nominal minimum diameter
mild steel tubing. All attachments by
welding unless otherwise specified.
|
| 4.6.5.2 |
Uprights and positioning: Each
of the rear uprights must be welded to the
main frame rails at a point aft
of the rear axle centerline. Each of the front
uprights must be welded to the
side frame rails at a point forward of the
steering wheel mount point and
aft of the leading edge of the front tire. All
uprights must create an angle
of no less than 45 degrees with the main frame
rails and have no bends within
three inches of attachment point except for left
rear. |
| 4.6.5.3 |
Top hoop rails: Corner construction
shall be of rounded type with no sharp
edges or corners allowed.
|
| 4.6.5.4 |
Shoulder harness mounting
bar shall be welded laterally between rear
uprights, double braced to the
top lateral bar, at a height suitable for harness
mounting. A minimum 6.0-inch
square headrest shall be mounted to the
braces level with the driver's
head. |
| 4.6.5.5 |
Side protection bars are mandatory
and must run horizontally between front
and rear uprights each side.
One end connection may be slip jointed. Side
protection bars must be positioned
vertically between the driver’s shoulder
and elbow. |
| 4.6.5.6 |
Roll cage overall width: 16.0
inches minimum. Width to be measured
outside to outside between any
two uprights. |
| 4.6.5.7 |
Roll cage overall height:
38.0 inches minimum. Height to be measured
vertically from highest lateral
cross bar centerline to main frame rail
centerline. |
| 4.6.5.8 |
All roll cages that deviate
in any way from the above description must be
brought into conformity or receive
approval from the race director or tech
inspector prior to be used in
competition. |
|
| 4.6.6 |
Front bumper: All components shall
be constructed of round, .065 wall steel tubing of
.750 inch nominal diameter minimum.
Front bumper must encircle entire front nose
area at a height of 7.75 inches minimum
from ground level. Double bumpers are
recommended. |
| 4.6.7 |
Rear bumper: All components shall
be constructed of round, .065 wall steel tubing of
.750 inch nominal diameter minimum.
Double bar construction is mandatory. Rear
bumper must encircle the tail section
of the kart. The top of at least one bar must be
7.50 inches maximum from ground level.
|
| 4.6.8 |
Nerf bars: All components shall be
constructed of round .065 wall steel tubing of .750
inch nominal diameter minimum. Double
bar construction is mandatory. The top of
the upper bar must be no higher than
the top of the rear tire. The bottom of the
lower bar must be no lower than the
bottom of the main frame rails. Nerf bar must
extend from an area inside a longitudinal
line from the outer portion of the front tire to
a point no further outboard than 1.0
inch from outer tire surfaces. |
| 4.6.9 |
Seat positioning: No part of the
seat may be positioned closer than six inches inside
the left-hand nerf bar. |
| 4.6.10 |
Harness: five points, SFI-rated
racing harness is mandatory. Metal to metal harness
fastener is mandatory. Mounting bolts
must be cotter-keyed and attach to a 3/16
inch minimum thick, 2.0 inch minimum
square steel mounting plate that is welded to
the frame and/or roll cage. Arm restraints,
attached to the harness, are mandatory. |
|
| 4.7 |
Champ Kart Bodywork Requirements |
|
| 4.7.1 |
All bodywork components must be
constructed of high strength plastic, fiberglass or
advanced composites only. |
| 4.7.2 |
No component of the bodywork may
be adjustable in any way while kart is in motion. |
| 4.7.3 |
Bodywork must be confined to the
area defined by the front and rear bumpers, inside
the area defined by the inside sidewalls
of the tires. |
| 4.7.4 |
Cockpit must be entirely open when
viewed from above. |
| 4.7.5 |
Wings, spoilers or other aerodynamic
effects are prohibited. Including wind
deflectors attached to the roll cage
|
| 4.7.6 |
Full, midget/sprint type, open wheel,
conventional construction methods only is
approved. Flat panels are allowed only
for side panels and all other body
components must have rounded, compound
curve configuration. Nose and tail
bodywork is mandatory. |
| 4.7.7 |
Tail section must be full, midget/sprint
type, fully enclosing the tail section, 15.0
inches minimum length, 13.0 inches
minimum width and 14.0 inches minimum
height.
|
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4.8
|
Junior Sportsman Champ
Kart Chassis Specifications
|
|
| 4.8.1 |
Mainframe members shall be constructed
of cold rolled, electric weld, round steel
tubing or other material of equal or
greater strength, of 1.125 inch nominal minimum
diameter, .083 inch wall thickness.
Conventional tubular space frame construction
methods only are allowed. (No bolt
on cages) Pre 2002 model Champ Karts
accepted providing they are in their
original manufactured configuration. No
modifications to the chassis or cage
allowed. Legality of non-conforming karts to be
determined by the Race Director.
|
| 4.8.2 |
Wheelbase: 40.0 inches minimum,
43.0 inches maximum. Wheelbase is measured
on true axle centerline, each side. |
| 4.8.3 |
Overall width: 38.0 inches minimum,
50.0 inches maximum. Overall width shall be
measured from outside tire sidewall
to opposite outside tire sidewall. |
| 4.8.4 |
Overall length: 80.0 inches maximum.
Overall length is measured at any cross
section of the kart, parallel to the
longitudinal centerline.
|
| |
 |
| |
 |
|
| 4.9 |
Roll cage specific specifications
|
|
| 4.9.1 |
Full roll cage of four point conventional
construction is mandatory. The four uprights
and top horizontal connecting tubes
must be constructed of 1.125-inch nominal
minimum diameter mild steel tubing.
All attachments by welding unless otherwise
specified. |
| 4.9.2 |
Uprights and positioning: Each of
the rear uprights must be welded to the main frame
rails at a point aft of the rear axle
centerline. Each of the front uprights must be
welded to the side frame rails at a
point forward of the steering wheel mount point
and aft of the leading edge of the
front tire. All uprights must create an angle of no
less than 45 degrees with the main
frame rails and have no bends within three
inches of attachment point except for
left rear. |
| 4.9.3 |
Top hoop rails: Corner construction
shall be of rounded type with no sharp edges or
corners allowed. |
| 4.9.4 |
Shoulder harness mounting bar shall
be welded laterally between rear uprights,
double braced to the top lateral bar,
at a height suitable for harness mounting. A
minimum 6.0-inch square headrest shall
be mounted to the braces level with the
driver's head. |
| 4.9.5 |
Side protection bars are mandatory
and must run horizontally between front and rear
uprights each side. One end connection
may be slip jointed. Side protection bars
must be positioned vertically between
the driver’s shoulder and elbow. |
| 4.9.6 |
Roll cage overall width: 16.0 inches
minimum. Width to be measured outside to
outside between any two uprights.
|
| 4.9.7 |
Roll cage overall height: 30.0 inches
minimum. Height to be measured vertically
from highest lateral cross bar centerline
to main frame rail centerline. |
| 4.9.8 |
Front bumper: All components shall
be constructed of round, .065 wall steel tubing of
.750 inch nominal diameter minimum.
Front bumper must encircle entire front nose
area at a height of 7.75 inches minimum
from ground level. Double bumpers are
recommended. |
| 4.9.9 |
Rear bumper: All components shall
be constructed of round, .065 wall steel tubing of
.750 inch nominal diameter minimum.
Double bar construction is mandatory. Rear 4.9 Roll cage specific
specifications bumper must encircle
the tail section of the kart. The top of at least one bar must be
7.50 inches maximum from ground level. |
| 4.9.10 |
Nerf bars: All components shall
be constructed of round, .065 wall steel tubing of .750 inch nominal
diameter minimum. Double bar construction is mandatory. The top
of the upper bar must be no higher than the top of the rear tire.
The bottom of the lower bar must be no lower than the bottom of
the main frame rails. Nerf bar must extend from an area inside a
longitudinal line from the outer portion of the front tire to a
point no further outboard than 1.0 inch from outer tire surfaces. |
| 4.9.11 |
Seat positioning: No part of the
seat may be positioned closer than six inches inside the left-hand
nerf bar. |
| 4.9.12 |
Harness: five points, SFI-rated
racing harness is mandatory. Metal to metal harness fastener is
mandatory. Mounting bolts must be cotter-keyed and attach to a 3/16
inch minimum thick, 2.0 inch minimum square steel mounting plate
that is welded to the frame and/or roll cage. Arm restraints, attached
to the harness, are mandatory. |
|
| 4.10 |
Junior Champ Kart Bodywork Requirements |
|
| 4.10.1 |
All bodywork components must be
constructed of high strength plastic, fiberglass or advanced composites
only. |
| 4.10.2 |
No component of the bodywork may
be adjustable in any way while kart is in motion. |
| 4.10.3 |
Bodywork must be confined to the
area defined by the front and rear bumpers, inside the area defined
by the inside sidewalls of the tires. |
| 4.10.4 |
Cockpit must be entirely open when
viewed from above. |
| 4.10.5 |
Wings, spoilers or other aerodynamic
effects are prohibited. Including wind deflectors attached to the
roll cage |
| 4.10.6 |
Full, midget/sprint type, open wheel,
conventional construction methods only is approved. Flat panels
are allowed only for side panels and all other body components must
have rounded, compound curve configuration. Nose and tail bodywork
is mandatory. |
| 4.10.7 |
Tail section must be full, midget/sprint
type, fully enclosing the tail section, 15.0 inches minimum length,
13.0 inches minimum width and 14.0 inches minimum height.
|
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