Mini 4WD MS Flex Fundamentals

MS Flex uses the MS platform's three-piece structure to let the front and rear respond more gently to rough landings. It is an advanced, open-class approach, not a required upgrade for every MS build.

Controlled travel beats loose movement

The aim is slow, repeatable movement with appropriate spring resistance and minimal rattle. Start from a stable standard MS, then test a conservative flex setup before pursuing more travel or lower friction.

Rules decide the build

Cutting and custom chassis work are not permitted in Stock Class and similar no-machining formats. Check the event rules first, and never sacrifice a solid drivetrain, roller layout and brake baseline for a complex flex conversion.