LOSI 22s Sprint Spec Wingless (Oval)

Class RulesWingless Losi SprintEffective Jul 13, 2026· Updated 3 months ago

Summary of recent changes

Official ThunderDome rulebook (rev 2026-07-13). Discipline: Oval.

Spec sheet

Governing

Notes: Wingless (min 2160g); Losi springs only; no added weight; SXT Black sauce; battery max 90F

Motor & ESC

Motor type: Stock / sealed
Spec motor: Stock Spektrum Firma 3300kV (SPMXSM488)
ESC: Stock SPMX-1106 Firma 45 Lite

Battery & power

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

Tires

Spec tire: Losi Hoosier Soft/Hard
Tire additive: Spec sauce only

Weight & body

Min weight: 2160 g
Body: Losi 22s poly body, NO front or main wing

Chassis & Suspension

Chassis: Losi 22S Sprint Car (RTR)

1.Chassis Spec

RTR LOSI 22s Sprint Car.

2.Weight Spec

Minimum 2160g wingless.

3.ESC

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

4.Battery Spec

Spektrum SPMX-1087. MAX temp 90F at tech table. 8.40 MAX VOLTAGE. Battery in stock battery box location.

5.Tire and Wheel Spec

LOSI Hoosier Soft (LOS-2442, LOS-2430) / LOSI Hoosier Hard (LOS-2418, LOS-2425). Sidewall glueing allowed.

6.Motor Spec

Stock SPMXSM488 Firma 3300k. Any 30mm x 30mm fan allowed in stock mounting location.

7.Body Spec

LOSI 22s POLY (PP) body in any color. Stock body parts cannot be removed. Any body piece may be painted or wrapped. NO front or main wing.

8.Miscellaneous

Transmitter Spektrum SLT2 or SLT3 & Spektrum SR215 receiver. LOSI springs only. NO added weight on chassis. Stock servo SPMS684. Stock spur gear LOS232038 & stock pinion TLR332020. Shock oil & diff grease open. BOX STOCK besides: any balls & ball cups or turnbuckle rod ends allowed / Hot Racing aluminum front camber block allowed / aluminum servo arm allowed.

9.Race Spec

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

10.Tire Sauce

SXT Black ONLY.