2021 Pro R/C Hobby & Raceway 12T Stock Mudboss Class Rules (effective July 15, 2021)

1 Any MudBoss BODIES only

1.1 - Any minor modification to the body must be approved before being allowed

1.2 Wrap or painted body, or can be kept clear.

1.3 Body must have visible transponder

1.4 Body must have visible number

1.5 Plastic hardware only

1.6 No added weight to body

1.7 No major trimming of body nose or wheel wells or wing or deck.

1.8 Body must be held on by 4 body clips with or without retainers.

1.9 Body pulls are allowed


2.1 - Traxxas 2wd (SLASH or RAPTOR) chassis only. Black / Grey

2.2 - Original MFG suspension parts only, no other parts allowed (such as from RPM)

2.3 - Original MFG chassis parts only, no aftermarket hop-ups, no optional aluminum parts

2.4 - Front bumper, right side bumper and front body post brace must be removed

2.4.1 - Left side and rear bumpers can also be removed (if desired), rear RPM bumper is allowed

2.5 - Traxxas front optional bumper (TRA2735) can be used (angled down)

2.6 - Major alterations to the chassis or modification to drivetrain/suspension components is not allowed

2.7 - Electronics (rx/esc/amb) must be installed within chassis surface (no outside installation)

2.8 - Battery brace can be trimmed to allow different LiPo battery wire configuration

2.9 - No adding weight in bulkhead or to chassis

2.10 - No cutting of chassis or major weight mods.

2.11 - RPM motor guard and mud flaps are allowed.

2.12 - No RPM transmissions


3.1 - Original Taxxas 2075 servo

3.2 - Traxxas 2075x (servo) and Traxxas 2072x (gears) are allowed as 'alternative' parts/servo

3.2.1 - The "Savox SC-0252MG Digital Servo" is allowed, this is an 'alternative' servo

3.2.2 - Savox gear set (SAVSGSC0251MG) can be used to 'upgrade' the Traxxas 2075 to metal gears

3.3 - it is allowed to 'pin' the servo saver (white) or bell crank (black) advised the servo gears might get broken under a heavy crash!!!

3.3.1 - Original Traxxas plastic servo saver/bell crank only (white or black system), it is allowed to mix the components
(i.e. black servo horn with white bell crank)

3.3.2 - It is allowed to use a solid (one piece) servo horn (any brand)

3.4 - 2-cell 7.4v LiPo battery with a maximum of 5200mah and 50c, with external plug only (no "bullet type" connector)

3.5 - Stock 12t Traxxas brand motor

3.6 - Stock 12t Traxxas tuned/tested motors allowed with stamp/test/inspected

3.7 - No fans on esc or motor

3.8 - Battery and esc, receiver needs to be secured to chassis.

3.9 - No direct wire to motor and esc


4.1 - Traxxas 76/83/86/90 spur with all transmission parts in place (slipper)

4.2 - Any pinion size

4.2.1 - Any pinion brand or type 48p only

4.3 - No modifications can be made to the transmission's case (ie.. to allow a bigger gear ratio)

4.4 - The gear cover must be off at all times to allow for visual inspection (CARPET)...and removed if asked (DIRT)

4.5 - The only adjustments allowed to the car are those allowed by the original MFG components of the car

4.6 - You are allowed to use any original wheel spacer combination (Black, Grey or any combination of both types) Metal hex is allowed.

4.7 - Transmission functionality rule (motor can't spin while turning slowly one rear wheel a full turn)

4.8 - Traxxas SLASH STEEL transmission gears only (internal plastic transmission gears not allowed)

4.9 - Adding weight (in any way) is not allowed, wheel balancing is allowed (sole purpose of balancing, not to add weight)
4.10 - Stock blue seal 5x11x4 ball bearings, no ceramic or hybrid or FastEddy bearings.

4.11 - Adding 5x8x2.5 ball bearing can be used in bell crank


4.13 - Any weight shock oil allowed, shock oil only.

4.14 - Any transmission grease, oil or lube is allowed

4.15 - No diff lockers

4.16 - No slipper eliminators


5.1 - TRAXXAS 2WD plastic shocks only (grey or black version) (fronts in front, rears in rear)

5.2 - Original Rear (Taxxas 5858) and Front springs (Traxxas 5857) (no LCG kit springs or aftermarket springs) no colored springs or Traxxas red springs.

5.3 - Front springs may be cut in order to shorten them (no more than 5 round removed on ONE end)

5.4 - The shock's travel may be shortened with internal shims (ie..fuel tube or solid shims...)

5.5 - Original shafts in original cylinder (length and type in proper cylinder)

5.6 - Original pistons from kit only (original 1,2 or 3 hole), no modifications can be made to them

5.7 - No front bump stop suspension, a single original blue bump stop can be used per rear shock (not mandatory)

5.8 - All suspension parts (such as A-Arms) must remain in original positions it was designed for (no swapping left to right)

5.8.1 - rear camber links must remain in original height position (upper hole on shock tower not allowed)

5.9 - METAL shock caps allowed. Traxxas brand only. Pink, red, green, blue, grey or house brand of ours only, with tech mark.

6 - TIRES/wheels

6.1 - Stock tires only. Spec, BF Goodrich, Kumo

6.2 - NO FOAMS


6.4 - Any 2.2/3.0 rim allowed

6.5 - Mud plugs are allowed


7.1 QF rounds 2 mins each with 2 QF rounds

7.2 C to F mains 2 mins

7.3 B mains 3 mins

7.4 A Mains 5 mins

7.5 If a hang up or crash before lap one, will pull all cars and move to next round unless all drivers agree to continue.

7.6 If hang up or crash a second time before lap one race will continue

7.7 If you brake you may keep driving unless you are hazardous to other racers.

7.7.1 If you are broken you must race on the outside wall if you can't keep up to speed or pull your car.

7.7.2 Any Marshall can pull your car if you are broken and can't keep up.

7.8 This is not bumper cars. Any out of control hitting or "going after" your car may be pulled.

7.9 If you cause a lipo battery fire you will be required to use a lipo safe bag.

7.10 No cars on floor only work area and track.

7.11 Any pre-approved or approved traction compound can be used.

7.12 No spraying chemicals or cleaning parts directly on the floor.

7.13 Marshals always maintain your area and pick up ALL cars quickly and safely

7.14 If during a race your transponder comes unplug or malfunctions in any way race will continue as normal.

7.15 Everyone will be tech before race

7.15.1 Everyone is subjected to get tech after a race

7.16 No lights that is blinding or distraction to any racer.

7.17 Any and all markers as in lights or led of such must be 100% secured to body not to chassis. If they fall off you may be asked not to run them.

7.18 Only 3D printed parts allowed is shock clips. NO OTHER PARTS ALLOWED.

7.17 Front nose can be held down by body pin, tape only no 3D printed push bumpers or holders. MUST BE SECURED TO FRONT BUMPER.

7.18 Broken bodies or parts are not allowed must be fixed or put new screws in or tape. No clue or extra added weight.

Each track has their own rules to make sure everyone has a good time

Short Course Modified 2021 Clay Track Rules

- Must be 2wd SC based chassis

- All suspension components, transmission, front and rear bulkheads must be on center line of the vehicle

- All larger volume OEM Chassis are legal IE "AE, TLR, Traxxas"

- Adjustable Rear Suspension arms are allowed
- Battery must be mounted on the centerline of the vehicle. Can be either designed front to back or sideways across the chassis but center of battery must be on centerline of chassis

- No dedicated 8th scale electronics. Must be 10th scale electronics

- Open 2.2-3.0 SCT or 2.2 Stadium Tires
- Mudboss bodies (sail panels legal, IMCA/UMP style permitted, left side air-dam bodies not allowed)

- No truck bodies or latemodel bodies allowed
- 2S lipo only

- Custom built chassis must be chili bowl legal.

Chassis Rules Below:

- Maximum Chassis width 7"

- Minimum Chassis width 5 1/8"

- Maximum left side of chassis can be from centerline is 3 1/2"

- Right side must be a minimum of 2.25" from centerline to outside edge of chassis.

- Cages: Must represent a cage, no solid plastic cages, must be cut the same on both sides.

- Minimum wheelbase 12.5"

- Maximum wheelbase 13.5"

- Shock bodies min length 1"
- Front Track width Min 10.875"

- Front track width Max 11.125

- Front Suspension arms must be equal size left and right

- Rear Suspension arms must be equal size left and right

ECX Novice 1/10 2wd Short Course Truck

- Must have a Short Course Truck Body, NO exceptions (Aftermarket SCT body is OK)

- 6 or 7 cell NIMH, or any 7.4 volt 2cell Lipo ONLY.

- Any Brushed Motor and ESC combo is permitted

- Any stock spur gear only
- Any pinion gear
- No shock limiters

- 100% stock truck

- RPM parts are ok but have to be made for the ecx sct truck.

- No chassis modifications allowed

- Stock transmission only. No alterations allowed.

- The use of boost/turbo/timing or any other method of Performance enhancing tuning is NOT ALLOWED.

- Any Transmitter/Receiver system may be used.

- Must use SC type tires and 2.2 inner 3.0 outer 1/10 scale SC wheels (Tire selection is open to your choice OR ANY ECX tire combination.

Open Mod 2wd 1/10th Short Course Truck 2021

- Must have a Short Course Truck Body, NO exceptions (Aftermarket SCT body is OK)

- Any 2WD 1/10th Production SC Truck {"TEAM" type kits OK)

- Must be a Short Course Production Truck

- 6 or 7 cell NIMH, or any 7.4-volt 2cell Lipo.

- Any Brushed/Brushless Motor and ESC combo is permitted (540/550 Sizing OK, No limits on Turn/KV rating)

- The use of boost/turbo/timing or any other method of Performance enhancing tuning is OK

- Any Transmitter/Receiver system may be used.

- Must use SC type tires and 2.2 inner 3.0 outer 1/10 scale SC wheels (Tire selection is open to your choice)

Street Stock 2021 Clay Track Rules (2021)

1 - Chassis

- Any 2wd 1/10th scale buggy. Must be a factory based off-road buggy.

- Approved manufacturers are Associated, Losi, Traxxas, Kyosho, Durango, Team C, Xray, Yokomo, Hobao H2.

- Chassis must remain stock, no aftermarket/non-oem upgrades except RPM Brand parts designed for the chassis.

- OEM Option parts sold by these companies designed for their cars are allowed.
- Big Bore and threaded OEM Shocks are allowed.

- SPRINGS: They can be from any manufacturer in the R/C Industry not only OEM.

- Rear wheel drive only.
- Mid or rear motor allowed.
- Adjustable rear A arms are NOT allowed.

- NO DRILLING or CUTTING of chassis

2 Body

- Must be closed windowed.

- Max 1" Spoiler measured from the deck. No End caps allowed.

- Body must include rear bumper.

Approved Bodies are:

- Custom Works - Part #9002,9075

- J Concepts - Part #395, #0422L

- ASSOCIATED - 71192, 71193

- McCallister Racing - Part# 125, 134, 136, 159, 181, 182, 264, 268, 290, 292, 303 ,306, 313, 318, 321

- MR/Kustoms - Part #18SS1W, 17SSPW, 18SS1S, 17SSPS
- Shark R/C Bodies
- Part #001- Hammerhead, #002- Outcast, #003- Wildcard, #004- Dawg Pound.

- Ask about other choices to be added.

3. Electronics

-ROAR legal 17.5 motor

-Any ESC in BLINKY mode (ROAR approved)

-Battery 2s 5200mah max

4. Tires

-Any buggy rim/tire ANY brand, NO FOAMS

Call us at 607-258-4004 today to make any suggestions for changes to the rules. Please note that rules are subject to change without notice.