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Ultimate RC Pitstop rules

Losi Sprint

v1
Class RulesLosi SprintEffective Aug 12, 2026· Updated 2 months ago

Summary of recent changes

Initial class rules from track.

Spec sheet

Governing
Notes
Out-of-box class; open radio, no gyro; stock 20T pinion/84 spur; stock kit or Mudboss-legal 5200 50C packs, no shorty/bullets; may change shock oil and tire compound
Motor & ESC
Motor type
Stock / sealed
ESC
Stock
Tires
Spec tire
Stock Losi Hoosiers (soft or hard compound)
Weight & body
Body
Stock Losi OEM plastic body, top wing and nose wing (any color)
Chassis & Suspension
Chassis
Box stock Losi Sprint

1.Overview

Losi sprint car class rules.

2.Controller

Open Controller/Transmitter - No Gyros.

3.Battery

Stock battery that comes with the kit or any Mudboss legal 5200 50c packs with T, xt60, Traxxas or stock connectors. No shorty packs or bullet connectors.

4.Shocks & Springs

You must use stock coils, stock pistons, stock shock shafts, stock shock caps etc. No adding internal limiter. You can change shock oil.

5.Gearing

Stock gearing - Pinion 20t & Spur 84.

6.Tires & Wheels

Stock Losi Hoosiers (soft or hard compound), must have visible tread. Any plastic wheel dot is allowed; you may run them on all four wheels.

7.Parts

No modifications to any of the stock parts. Must use the stock motor, ESC and servo. You may use the stock servo saver or stock straight arm.

8.Body

Must have complete stock body with driver, headers, bumpers, top wing and nose wing. (Must run all the cosmetic parts that come with the car.) No lexan bodies, only stock Losi OEM plastic bodies (any color).

9.General

No adding weight, no grinding, no shimming of suspension. No ceramic bearings. No aluminum aftermarket parts. Heavy Duty Ball Cups permitted.

10.Summary

The rules are very simple - this is basically an "Out of the box" sprint car class that will allow the racer to change shock oil, battery connection, tire compound (hard or soft Losi compounds), Heavy Duty ball cups & an Open Radio transmitter (NO GYRO).

Version history

v1Published.
Aug 12, 2026