Losi 22S Spec (Box Stock) Sprint Car Rules

Class RulesLosi SprintEffective Jul 28, 2026· Updated 3 months ago

Summary of recent changes

Current class specification.

Spec sheet

Governing

Notes: Stock servo SPMS684, spur LOS232038, pinion TLR332020, RX SR215, TX SLT2/SLT3; shock/diff oil open; Losi springs only; no added weight; TLR/Losi ball cups only

Motor & ESC

Motor type: Stock / sealed
Spec motor: Losi SPMXSM4800 (stock, fan on waterfall)
ESC: Stock (SPMX-1106)

Battery & power

Max voltage: 8.44V

Tires

Spec tire: Losi Hoosiers — Soft (F LOS-2430, R LOS-2442) or Medium (F LOS-2418, R LOS-2425)

Weight & body

Body: Stock cage/panels/wings, no Lexan; all nerf bars, driver, interior retained

1.Body & wings

Stock cage and panels (any color); painted or decals, no Lexan. Stock wings. Must run all nerf bars, stock driver figure, and interior — nothing removed.

2.Electronics

All stock: ESC SPMX-1106, motor SPMXSM4800 (fan on the waterfall), servo SPMS684, spur LOS232038, pinion TLR332020, RX SR215, TX SLT2 or SLT3.

3.Battery

SPMX-1087, SPMX50002S30H5, or SPMX52S30H5; 8.44V max.

4.Tires

Losi Hoosiers — Soft (F LOS-2430, R LOS-2442) or Medium (F LOS-2418, R LOS-2425).

5.Setup

Shock oil open, diff oil open, Losi springs only, no added weight. No upgrades or modifying; TLR/Losi ball cups only.

Version history

v1Published.

Jul 28, 2026