LOSI 22s Dirt Late Model (Box Stock)

Class Rules1/10 Losi Dirt Late ModelEffective Aug 4, 2026· Updated 3 months ago

Summary of recent changes

Initial rules (2026-08-04).

Spec sheet

Governing

Notes: Box stock; max battery temp 90F; SXT Black sauce only; Losi springs only, no added weight.

Motor & ESC

Motor type: Stock / sealed
Spec motor: Stock SPMXSM4800
ESC: Stock SPMX-1106 Firma 45 Lite

Battery & power

Battery chemistry: LiPo
Cells: 2S
Max voltage: 8.40V

Tires

Spec tire: Losi Hoosier spec (LOS-4247/4237/4641/4642)
Tire additive: Spec sauce only

Weight & body

Body: Losi 22S Dirt Late Model body w/ driver, interior, cage; stock spoiler only

Chassis & Suspension

Chassis: RTR Losi 22S Dirt Late Model

1.Chassis Spec

RTR LOSI 22s Dirt Late Model. All parts ran in stock location. No heating and bending parts or removing any plastic from spitters.

2.ESC

Stock SPMX-1106 Firma 45 Lite in stock location. IC5 connector.

3.Battery Spec

Spektrum SPMX-1087, SPMX50002S30H5, or SPMX52S30H5. MAX temp 90F at tech table. 8.40 MAX VOLTAGE. Battery allowed anywhere within stock battery box.

4.Tire & Wheel Spec

LOSI Hoosier Soft Black wheel (LOS-4247), Medium Black (LOS-4237), Soft Aluminum (LOS-4641), or Medium (LOS-4642). Sidewall glueing allowed.

5.Motor Spec

Stock SPMXSM4800. Any 30mm x 30mm fan allowed in stock mounting location.

6.Body Spec

LOSI 22s Dirt Late Model with driver, interior and cage (no removing body parts). Stock spoiler only, no additional lexan. Painting spoiler, driver, cage wheels allowed along with any wrap or body paint.

7.Miscellaneous

Transmitter Spektrum SLT2 or SLT3 & SR215 receiver. LOSI springs only. NO added weight on chassis. Servo (stock) SPMS684. Spur (stock) LOS232038 & pinion (stock) TLR332020. Shock oil & diff grease open. BOX STOCK besides — any LOSI/TLR ball cups or turnbuckle-rod ends allowed; plastic servo arm allowed.

8.Race Spec

2-4 minute heats / 60-75 lap mains.

9.Tire Sauce

SXT Black ONLY.