- Shall constitute one rear drive axle with 2
- Shall constitute two drive axles; one rear
drive axle with two wheels and one front
steer drive axle with two wheels. On pulling
vehicles the front and rear tires will be
no more than 1 inch difference in diameter.
On racing vehicles the front and rear tires
will be the same size in diameter and
width. 4WD vehicles will be true 4WD
vehicles. The Big Rig class is the only
class allowed to use tandem drive axles.
- Shall be NiCd or NiMh cells only. Factory
built batteries will be encased in the original
factory wrapper with the label attached.
All other batteries must be in clear shrinkwrap
or clear tape. No added opaque tape
or shrink wrap allowed. Batteries will be
readily available R/C type. Example of a
non-usable battery is the military issue
3volt “C” size. Individual class limits will
be listed in that class section of this rulebook.
- Shall be the shell that gives the vehicle its
shape and allows it to resemble a full size
car, truck, or tractor.
- Frame of the vehicle not including suspension,
steering, body or gearbox.
- Dual wheel:
- More than one tire on one rim or a combination
of more than 1 tire with one rim on
each side of an axle. No dual wheels are
permitted. Foam tires may be glued together
to make 1 tire on 1 rim and shall not
be considered dual wheels.
- Electronic Speed Control
- Factory production:
- Any R/C product manufactured by a recognized
R/C supplier in quantities of no less
than 100 units per year. Bodies are not
required to be “factory production” as long
as they are realistic. Please refer to motor
rules for specifics on them.
Factory production vehicle: Any factory production vehicle kit originally
manufactured for use other than a
pulling vehicle. For example a Tamyia
Clodbuster or a HPI Wheelie King are
“Factory Production Vehicle”.
- Front axle:
- The device mounted at the front of the vehicle
in order to provide a means for steering.
The axle will be mounted so that the
wheels line up with the wheel openings in
the body. Exceptions will be made for
“Factory Production Vehicles”. The tires
on hinged or floating front axles are not
allowed to contact the track surface if the
vehicles front end lifts ¾ of an inch or
- Front wheel openings:
- The open place that allows the front wheels
to have clearance to move when turned to
the right or left. The wheel openings will
be located behind the front most part of the
body. Front wheels are not allowed to extend
more than one inch on either side of
the body. Exceptions are made for 4WD
vehicles, Factory Production Vehicles that
must run the original suspension, and replicas
of full size vehicles.
- The unit consisting of the gears, belts,
chains, case and/or mounting brackets. The
gearbox is the means for transmitting the
power from the motor to the wheels. An
additional gearbox refers to a second gearbox
that is attached to the main gearbox.
- The apparatus used to hook the pulling sled
to the vehicle. The hitch shall incorporate a
5/16 inch hole for the sled hook and will be
no more than ½ inch from the rearmost end
of the hitch drawbar. The hole must be
located behind the axle. The sled chain will
have a clear path to the hole with no interference
from the vehicle. The hitch is to be
fashioned from a strong and rigid material.
All hitches will be rigidly mounted. The
hitch must be mounted in such a way to not
allow any movement longitudinally, vertically,
or horizontally. Adjustable hitches
are permitted but must be locked in position
when pulling. Unless otherwise noted in the class rule the
maximum hitch height is 4”. The following
will also apply to the 2” maximum hitch
height classes. The hitch is measured by
placing the vehicle on the tech table, without
any downward pressure during inspection.
Horizontal hitches will be measured
to the top of the hitch. Vertical hitches will
be measured to the top of the hole. Any
hitch with multiple holes will have the
holes above the maximum covered with
- Intentional jerking:
- The act of deliberately manipulating the
controls of the vehicle in a way to advance
the sleds position in an erratic manner.
- Manufacturers Suggested Retail Price.
Maximum motor size: The total outside length and diameter of
the motor not including the output shaft.
- Measuring device:
- All measurements are to be made with a
normal ruler. Micrometers and the like are
not to be used for tech.
- Monster truck:
- A vehicle with oversized tires designed to
go over large obstacles at a fast pace.
Original: As manufactured and unmodified.
Production Pulling Vehicle: Any vehicle manufactured specifically for
pulling. This may be “factory production”
or scratch built.
- Radio controlled.
- R/C Motor:
- A motor that is designed and built for the
- Readily available:
- Available off the shelf from hobby shops,
distributers, or from retail mail order outlets.
Special order or custom made items
are not considered to be “readily available”.
Scale appearance: Having the scaled down look of a full size
vehicle or part.
- The device used to create a drag on the
pulling vehicle in which to stop the vehicle.
- Factory original for that vehicle or piece of
- Traction compound:
- Anything that is foreign to that tire. Any
substance that was not made for, put on, or
into the tire at time of manufacture. Tire
glues are allowed to mount tires to rims or
to glue two tires together in order to make
a wider tire.
- Tread width:
- The width of the tread only. This does not
include the sidewalls.
- Tube chassis:
- A chassis that is constructed of square,
round, hollow or solid tubular stock. The
chassis is the component in which the gearboxes,
suspension, radio equipment, battery,
body and all other vehicle components
- An assembly consisting of one tire and one
- Wheelie bar:
- A device mounted to the rear of the vehicle
to prevent the vehicle from flipping over
backwards once the vehicles front tires
loose contact with the pulling surface. This
device is made up of a single or pair of
bars with one or two wheels mounted on
the bars. Wheelie bars are permitted in all
classes. They may not extend past the legal
length of the vehicle and may not interfere
with the operation of the pulling sled in
any way. Skid plates are not permitted. In
the dirt classes skid pads may replace the
wheels on wheelie bars for scale appearance.
Flexible straps for static grounding
are only permitted to touch the pulling
surface. Wheelie bars are not to be use to
rock the vehicle back and forth. This
would be considered intentional jerking.