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Ultimate RC Pitstop rules

Dirt Midget

v1
Class RulesMidgetEffective Aug 12, 2026· Updated 2 months ago

Summary of recent changes

Initial class rules from track.

Spec sheet

Governing
Notes
Non-adjustable rear arms only; LR toe-in via toe block only, RR toe-in only (may NOT toe out); wheelbase 9.5-10.0", width 8.5-10.0"; 3-gear transmission (2/4/5 allowed), no gear diffs; steel CVA/CVD only; no brass/tungsten/steel ballast hubs/arms.
Motor & ESC
Motor type
Spec brushless
Motor turn
13.5T
Spec motor
Hobbywing 13.5T Justock (#30408010)
ESC
Hobbywing Justock (#30112005)
Blinky mode
zero_blinky
Battery & power
Battery chemistry
LiPo
Cells
2S
Hard case
Required
Tires
Spec tire
Quasi Speed 2.2 (2WD only)

1.General

All height measurements are from the bottom of the chassis unless otherwise noted. Maximum Overall Length: 16.750". Maximum Chassis width: 4.2". Maximum of 4 shocks can be used. Solid axles are allowed; if solid axles are used the rear axle must be square with the centerline of the chassis and parallel to the front axle.

2.Wheelbase

Min 9.5" Max 10.0"

3.Width

Min 8.5" Max 10.0"

4.Rear Toe

Only non-adjustable rear arms can be used. Trackside toe adjustable rear hubs and a-arms are not allowed. Trackside adjustable wheelbases are not allowed (can't have toe blocks or anything else attached to an easily adjustable mechanism to allow for wheelbase change trackside). Left rear can be toed in via toe block. Right rear can be toed in but can NOT be toed out.

5.Offset

Right side of the cage can be no further offset from the outside of the RR tire than 3.625".

6.Ballast Weight

Brass, tungsten or steel hubs, arms, arm inserts, caster blocks, steering arms are not allowed. Ballast weight attached to the main chassis area is allowed as long as it's secured properly.

7.Transmission

3 gear transmissions only. No DC. 2, 4 or 5 gear transmissions will be allowed. All gears must be full gears. No narrowed or lightened gears allowed. Plastic, aluminum and steel gears are permitted. Steel outdrives only. Blades are permitted. No gear diffs allowed. No rear motor cars allowed unless you can do it in a manner that the tail tank is appropriately sized and located.

8.Solid Axle Option

If a solid rear axle design is used, the motor must be mounted to the chassis and cva/cvd must be used to drive the rear axle. No belts or chains will be allowed. A spur gear and pinion must be used in conjunction with the motor plate mounted to the chassis.

9.CVA/CVD

Dog bones must be equal length. Axles and bones must be made from steel. No aluminum, titanium or magnesium axles or bones allowed.

10.Motor / ESC / Battery

Speed Controller - Hobbywing Justock Speed controller # 30112005. Motor - Hobbywing 13.5T Justock # 30408010. Battery - 2S hard case lipo.

11.Tires

Quasi Speed 2.2 - 2wd only.

12.Body Rules

Cage - Must have a scale appearing contemporary cage made of rounded stock. The cage must be symmetrical left to right and mounted level to the chassis. Maximum cage width at driver down tubes and top frame rail: 3.600". Minimum cage height 6.00", maximum cage height 6.25" from top of chassis to top of cage at highest point. Rear "down tubes" must slant forward. All components must be mounted on the centerline of the cage. Chassis may not extend outside of the side panels by more than 1/4" on either side. Bumpers - A tubular front bumper must be used and may not be designed to direct air or create downforce. Maximum height of front bumper is 1.5" from the bottom of the lowest point of the chassis. Scale appearing side nerf bars must be used on both sides. A scale appearing rear hoop style bumper must be used. Bumpers and nerf bars must be made of rounded stock with no sharp edges. Tail tank - A traditional scale appearing rounded style three-dimensional rear fuel cell must be used. A rectangle (Swindell) style rear tank is allowed but must have a proper style rear bumper to go with it. You cannot simply have a flat tail section with no bumper. Headers - Three-dimensional scale appearing headers, head and oil tank must be used on the left side of car in "engine area". Material must be plastic or aluminum. Not allowed to make inserts for these to add ballast weight. Side panels - Flat side panels may be made from molded or fabricated polycarbonate. Maximum height of side panels in front of the driver cockpit is 4.50" from the bottom of the chassis. Must have minimum of 1/2" high by 2.5" long openings on both sides of cage in driver compartment. Additional material to replicate a scale appearing driver may not exceed 1" x 1". Side panels may not extend beyond the cage by more than 0.25". Side panels may not extend into the area behind the rear axle AND below the top of the rear nerf bar. Driver arm guards and engine vents may not extend more than 3/8" from the side panels. Hood - A scale appearing hood must be used, defined as beginning at the point where torsion tubes or cross brace would be on a 1:1 car behind the front bumper. The hood must be tall/wide enough for a scale engine intake and air cleaners. Minimum vertical gap from top of hood to bottom of front cage crossbar. Nose Area - No molded or fabricated nose piece may be used, defined from where the torsion tube or cross brace would be on a 1:1 car. You cannot have anything below that point on the same plane as the hood. No scoops or bodywork allowed in this area; side panels along the front of the cage are allowed but cannot stick past the cage sides.

Version history

v1Published.
Aug 12, 2026