OPEN BOX STOCK

Box Stock mechanics with limited same-specification cosmetic replacement.

CLASS PHILOSOPHY

Personalize the car without converting cosmetic changes into hidden performance upgrades.

✅ ALLOWED

→Everything permitted in Box Stock.
→A different color of the same chassis mold and material.
→A different color of the same wheel mold, diameter, width and material.
→A different color or print of the same body/cowl type.
→Same-specification replacement parts for repair, subject to inspection.

⚠️ ALLOWED WITH CONDITIONS

→A cosmetic replacement must be functionally identical to the original part; color alone may change.
→When two versions look similar but use different materials, offsets, tire compounds or geometry, the replacement requires pre-approval.

❌ NOT ALLOWED

→Changing wheel design, diameter, width or offset.
→Changing tire compound, size or profile.
→Changing chassis type, A-parts geometry, motor, gears, rollers or bearings.
→Any performance upgrade, cutting, drilling, sanding, countersinking, wheel piercing or tire processing.
→Using limited-edition parts that are mechanically different from the kit component.

SCRUTINEERING

CLASS INSPECTION

1Replacement parts match original mold and specification

2Stock motor, gears, rollers and bearings

3No tire or wheel performance change

4No machining or added tuning parts

5General safety and measurements

OFFICIAL DECISION

Rulebook v1.0 applies from 30 July 2026. A configuration not explicitly described must be shown to the race director before inspection. Approval at one event does not automatically create a permanent rule.

VIEW MOTOR MATRIX OPEN BUILD GUIDES