KB Miniracing Rules

Mini-Z and 1/28th Rules

We will be running the rules from 28SRA found here https://www.28sra.com/en-it/pages/28sra-rules with the following exceptions below:

  • Box Stock class will be limited to Kyosho tires

  • Any class where the MR-03 is eligible the MR-04 will be eligible

  • We are allowing the Kyosho Aluminum Knuckle 0 degrees as the stock replacements are too hard to get and to help with durability.

  • Currently are popular classes are the Box Stock, 2500 Lipo, and our Open Pan (2wd Mod) and Open AAA (Evo's)

Our most important rule is we are here to have fun!

If it is not listed in the rules that you can do something, then please ask before you do it!

Losi NASCAR Cup Series Rules

Our Purpose

The KB Mini Racing Losi NASCAR Cup Series is designed to provide fun, affordable, close racing that captures the spirit of full-size NASCAR.

Our goal is simple:

· Buy a car.

· Charge the battery.

· Come race.

The class is intended to keep competition focused on driver skill rather than spending money on upgrades. A new racer should be able to purchase a stock Losi NASCAR and immediately be competitive.

Eligible Cars

Only the following Losi NASCAR Cup Series cars are permitted:

· Toyota Camry

· Chevrolet Camaro

· Ford Mustang

General Rules

Cars must remain in their original, stock configuration.

Allowed

· Cleaning and blueprinting components (bearing flush, motor cleaning, gear cleaning, etc.)

· Any shock oil

· Differential rebuild using grease only

· Standard aluminum motor heat sink (no fans)

· Aluminum 20-tooth servo saver for the stock low-profile servo

· Replacement hardware (wheel nuts, body clips, individual screws) if originals become damaged

· KB Mini Racing transponders and adapters

Not Allowed

· Removing, modifying, machining, or lightening stock parts

· Added ballast

· Differential oil (grease only)

· Cooling fans

· Complete aftermarket screw kits

· Electronic modifications

Tires

Only stock Losi yellow-sidewall Goodyear tires are permitted.

Allowed:

· Stock Medium compound

· Optional Losi Soft compound

Not Allowed:

· Losi Super Soft (red sidewall) tires

· Tire traction compound

Super glue may be applied to the tire sidewalls, but a portion of the yellow Goodyear lettering must remain visible.

Bodies

Approved bodies:

· Toyota Camry

· Chevrolet Camaro

· Ford Mustang

Not Allowed:

· Super Late Model Camaro

· Aftermarket bodies

Clear Losi replacement bodies are permitted and should be painted to resemble a NASCAR Cup Series car whenever possible.

Requirements:

· Three race numbers in standard NASCAR locations

· Windows may remain clear or be painted black

Batteries

Only the stock Losi Spektrum SMART 1400mAh battery included with the car may be used.

Any battery charger is permitted.

Radio System

Only the stock transmitter included with the vehicle may be used.

No electronic modifications are permitted.

Our Philosophy

This class exists to keep racing:

· Affordable

· Competitive

· Beginner-friendly

· Fun

The less time spent chasing upgrades, the more time we spend racing.

© 2025. All rights reserved.

Contact

KBMiniracing@gmail.com

911 Washington Blvd #205 Roseville, CA 95678