Stock Slash Dirt Modified (MDM) Rules

Class RulesTraxxas ModifiedEffective Jul 28, 2026· Updated 2 months ago

Summary of recent changes

Current class specification.

Spec sheet

Governing

Notes: Open gearing; no sway bars; min ride height 0.75"; min tread 0.065"; stock diff; Traxxas tuning springs uncut; no 2-stage pistons

Motor & ESC

Motor type: Spec brushed
Motor turn: N/A (brushed)
Spec motor: Traxxas Titan 12T 550 (brushed, unaltered)
ESC: Stock XL-5

Battery & power

Battery chemistry: LiPo
Cells: 2S
Max voltage: 8.44V
Hard case: Required

Tires

Spec tire: Slash Spec, Kumho Venture, or BFGoodrich (no S1)

Chassis & Suspension

Chassis

1.Chassis

Stock Traxxas Slash 2WD chassis, unmodified. Suspension in factory positions. Traxxas/RPM aluminum parts per approved list; front-bumper hoop/ears may be trimmed. No sway bars. Min ride height 0.75" (incl. body). Added weight only within the main chassis plate.

2.Transmission

Stock differential — no locking/modifying, must retain diff action. No ball diffs.

3.Motor & ESC

Stock XL-5 ESC (unaltered) and Titan 12T 550 brushed motor (unaltered). Stock bullet connectors, no soldering. No cooling fans.

4.Battery

Any ROAR-approved 7.4V hard-case LiPo, 4.22V/cell max. Mounted in the stock center tray; any battery plug, no direct soldering.

5.Wheels & tires

Any 2.2/3.0 SC wheel for the 2WD Slash (19mm F / 21.5mm R, 2+ vent holes). Stock Traxxas Slash tires: Slash Spec, Kumho Venture, or BFGoodrich (no S1). Min tread depth 0.065". One foam insert per tire.

Version history

v1Published.

Jul 28, 2026