Mini 4WD Stock Class and B-MAX Setup

Stock Class and B-MAX-style racing put the emphasis on legal bolt-on parts, careful assembly and course reading rather than fabricated chassis work. That makes a clean, repeatable build more valuable than an aggressive open-class recipe.

Start from the rulebook

Do not cut, lighten or add custom chassis features where the class prohibits them. Choose compatible Tamiya parts, confirm dimensions and keep a simple inspection checklist for wheels, rollers, screws, body and batteries.

Win the details

Use a quiet drivetrain, true tyres, even roller alignment and controlled braking. Test a legal baseline repeatedly, then make small reversible changes. Verify the host event's exact rules because local formats can add requirements.