Box Stock Class: Rules & Regulations

Only genuine Tamiya cars and parts are permitted.

Single Kit Build (Brand New Kits): Your entry must be a complete build from a single Mini 4WD kit. Mixing and matching parts from different kits (e.g., swapping a chassis or rollers from another box) is strictly prohibited.

Exception: Kits previously modified can be restored to stock.

Motor Specifications: Only the standard Tamiya Type 130 motor (Stock Motor) is permitted. This includes motors with white or blue end caps.

Special Kits: Starter Kits and EVO Kits are permitted only if they use the stock motor and have no additional upgrade plates or parts attached.

Animal/Tuned Kits: Kits that originally include "Tuned" motors (e.g., Animal series kits) are allowed, provided the motor is replaced with a standard Type 130 stock motor.

Build Integrity: All kits must be assembled exactly as per the provided instruction manual.

Tire & Wheel Security: The use of double-sided adhesive tape or glue to secure wheels to the axles or tires to the wheels is prohibited.

Aesthetics: Plain bodies/cowls are not permitted. To be race-ready, the kit-included stickers must be applied, or the body must be painted.

Identification: The racer’s name must be clearly affixed to the bottom of the chassis for identification.

No Upgrades: The use of any Tune-Up, Grade-Up, or Upgrade parts is strictly prohibited.

No Modifications: Any modification to the kit—including bending screws, thinning/shaving parts, or reinforcing the chassis—is prohibited.

Note: If a car is damaged during the finals (e.g., quarter-finals onwards), the racer will be granted a few minutes for emergency repairs (gluing). The car must be retired immediately following the conclusion of that race.

Battery Regulations: Only AA Alkaline or NiMH rechargeable batteries are permitted. Batteries with tampered, torn, or removed wraps/skins are prohibited for safety.

Winning: For a car to win all four wheels must cross the finish line upright and must complete the race with no part falling off.