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Big Daddy's Indoor Motorsports rules

Nastruck Rules

v1
Class RulesNastruckEffective Aug 15, 2026· Updated 2 months ago

Summary of recent changes

Stock (brushed) NASCAR 1/12 car with a truck body — same spec as Losi NASCAR.

Spec sheet

Governing
Notes
Max battery temp 90F; SXT Black sauce only; 25mm fan allowed.
Motor & ESC
Motor type
Spec brushed
Motor turn
N/A (brushed)
Spec motor
Stock 28-turn 380 (LOS-1907 or ARRMA ARA390305)
ESC
Stock 25A brushed (SPMXE3125RX)
Battery & power
Battery chemistry
LiPo
Cells
2S
Max voltage
8.40V
Tires
Spec tire
Losi spec (LOS-1914 med / LOS-1937 soft / LOS-3779)
Tire additive
Spec sauce only
Weight & body
Min weight
945 g
Body
Pro-Line truck body (Tundra/F-150/Silverado/Ram), precut, stock height
Chassis & Suspension
Chassis
RTR Losi NASCAR or ZL1 Asphalt Late Model

1.Chassis Spec

RTR LOSI Nascar with stock body mounts, front and rear splitter, OR RTR LOSI ZL1 Asphalt Late Model with stock body mounts, front and rear splitter. Un-modified. No removing any parts. No heating or bending parts.

2.Weight Spec

Minimum 945g in race-ready trim.

3.ESC / Receiver

Stock SPMXE3125RX / Stock SPMXSE3325RX / SLT RX / 25A Brushed ESC IC2 plug.

4.Battery Spec

Stock SPMX142S30H2 Spektrum 1400 2S 7.4V Smart G2 30C lipo / Ovonic 1700 2S with IC2 plug / Ovonic 1400 2S with IC2 plug. MAX temp 90F at tech table. 8.40 MAX VOLTAGE. Battery in stock battery box location.

5.Tire and Wheel Spec

LOS-1914 (medium) or LOS-1937 (soft) / LOS-3779 (medium) Asphalt Late Model. Sidewall glueing allowed.

6.Motor Spec

Stock LOS-1907 28-turn 380 or ARRMA ARA390305 28-turn 380 with original bullet plugs from LOS-1907 installed. LOSI Nascar 380 Aluminum Motor Heatsink LOS-1920 allowed.

7.Body Spec

Truck body: Pro-Line Tundra / Pro-Line F-150 / Pro-Line Silverado / Pro-Line Ram. All bodies precut, no body trimming. Mounted at stock height, not lowered.

8.Miscellaneous

Shock oil & diff grease open. Motor fan may be any 25mm x 25mm fan. Stock springs, bearings, pinion, spur, servo & RTR radio only. No LOSI option parts besides heatsink. All chassis screws must be installed.

9.Race Spec

2-4 minute heats – 60-250 lap mains (OVAL) / 5 minute qualifiers – 5 minute mains (ON-ROAD).

10.Tire Sauce

SXT Black ONLY.

Version history

v1Published.
Aug 15, 2026