Race Classes
(updated 2025.4.9)

Chassis - Mini Z with any radio supporting the box stock receiver. 98mm wheelbase is highly recommended

Body - Hard body with lights and hard plastic windshield installed. Stock rear wing.

Motor/Pinion - White endbell motor with 6t pinion and stock spur gear

Upgrades

• Bearing Set

• Front Spring Set

• Any Kyosho T plate

• You may flip the king pins (highly encouraged actually)

Batteries - 4 cell NIMH

Tires – Any brand 8.5mm wide front, 11mm wide rear. Any rubber RCP use tire. No Foam. No Silicon.

Wheels – Any brand that fits standard Mini Z RWD

Note: Depending on skill, the Race Director/club might suggest running in a "novice" heat as you start to get comfortable being on the track with others.

If you are completely new to Mini-Z, then we suggest jumping into our "Getting Into Mini-Z Racing" guide with helpful links for items and tips as you start to race. 

Kyosho GT Masters is designed as a class for skilled drivers wishing to race at a lower performance level. Even though the motor is slower the intention is to increase competition for any given race. Therefore racers who wish to race in this class must demonstrate driving skill through qualifiers. There are 3 ways to gain entrance to this class. 

Ways to participate

1. Prequalify. Enter in Kyosho GT (Blue motor) and complete XX laps in a qualifier or main.

2. Race. Enter Kyosho GT Masters (Green motor) prior to Jan 21 2022 and complete XX laps in a qualifier or main.

3. Seeding race. These will take place prior to the first qualifier on a race night. You will be having a heads-up race with at least 3 cars on the track and must complete 26 laps. There will be no qualifying. There are no restrictions for a seed race, so 2 other previously qualified racers can run for the test.

Series qualifying

Instead of starting all over each race-day, results from the previous race are used to sort the qualifiers. 

• First week of competition will be random for the first qualifier with re-sorts for the remaining qualifiers and main. The final sort will determine the Mains. It will be possible to knock slower cars out of the higher main regardless of qualifying order.

• Starting with the second week and continuing, we will use previous week’s finishing order for the first heat (qualifier). Heats are in reverse order so the last place car is in the first heat with the fastest in the last heat. New racers will be put in the first heat. The remaining heats and main will be sorted based on best heat. It will be possible to knock slower cars out of the higher main regardless of heat order.

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Chassis: 

Kyosho Mini-Z chassis

Kyosho Narrow or Wide front end
90-102mm wheelbase

Electronics: 

Any radio

Open ICS settings

Motor:  

Brushless 4100kv (greeen) Kyosho only 

No brushed equivalent 

Gearing limit:

44/8 fixed gearing 

Differential:

KYOSHO gear or ball diff allowed

Battery:

4xAAA NiMh batteries

Body:

AUTOSCALE PREFERRED/White body assembled with all pieces, windows installed. Body reinforcement and bumpers are permitted. Clearance issues may be addressed, front splitters may be rounded. Bodies have to be real world models, no jomerema like bodies.

Wing:

Lexan rear wing is allowed. Wing height no more than 10mm

Wheels:

Any Mini-Z type wheels, plastic or aluminum

Tires:

Rubber tire of any company, no silicone or foam

Performance option parts: 

• Fixed lower front arm as in box stock. No Double A arm allowed. 

• Any KYOSHO/R246 upgrade that will fit on a stock Kyosho chassis without modification to the chassis itself.

• No drilling of extra holes. 

• PN chassis are designed to be directly retrofit to any Kyosho build and are NOT allowed.

• Any R246/Kyosho rear pod or damper setups are allowed. 

• Bearings

• T-plates 

• wheelnuts

• servo gears

• springs

• kingpin flip

Weight Limit: 160g
Dimensions:  WxLxH  82x200x70mm max

Drivetrain: RWD

Body: GL Lexan body, kit rear wing, aftermarket front wings with rollers allowed

Chassis: GL GLF1, 114mm wheelbase

Electronics: Hobbywing Mini28, no boost, no turbo and blinking

Motor: HRC 2500KV Sensored motor

Gearing: 53/10

Battery: 8.4V charging limit on a 2S lipo battery

Wheels and Tires: GL wheels and the tires from GL and Marka designed to fit them

Hardbody | 2500kv | Fixed gear

Please review this class rules on the Rocky Mtn 1/28th Scale Alliance rules website.  You can also connect with other drivers at the Rocky Mtn 1/28th Scale Alliance Facebook Group.

NOTE: Depending on interest, this might run with SPEC 2500kv HardBody

Chassis: 

1/28 rear 2WD solid axle, aka “live axle”
98mm & 102mm wheelbase

ESC:

NHX RC Mini 28 Pro, Rocket RC Mini 28 Pro, Rocket RC Kiwami
(ESC MUST BE IN BLINKY MODE - NO BOOST, NO TIMING)
NO GYRO

Motor:

NHX RC 2500kv Sensored

#NHX3010

Battery: 2S Li-Po

Gearing: 

53T fixed gearing. 12t pinion
NOTE: The pinion size will be determined prior to the beginning of the next series.  Contact members in Slack for current configuration.

Body:

Any manufactured molded hard shell that fits the allowed wheelbase. All parts must be the original for that body. Limited wheel and ground clearance modifications are allowed. The body must weigh a minimum of 26 grams. Side clips if used,  are considered part of the body. Lexan roofs, windows, and wings are allowed. Aftermarket plastic wings are allowed. 102mm wheelbase can use a lemans based hard body.

Wheel:

20mm max diameter, both front and rear

8.5mm max width front

11mm max width rear

Tires:

Any production rubber Mini-Z tires

NO SILICON, NO FOAM

Weight: Min.Weight 160g

Should someone purchase a motor made on a Friday, missing a winding that is demonstrably faster than the rest of the field, we will take reasonable action to remedy the situation, to maintain fair competition and race pace.

NOTE: Depending on interest, this might run with Lipo Stock (28SA) 12t

Chassis:
1/28 rear 2WD solid axle, aka “live axle”

98mm & 102mm wheelbase

ESC:

NHX RC Mini 28 Pro, Rocket RC Mini 28 Pro, Rocket RC Kiwami
(ESC MUST BE IN BLINKY MODE - NO BOOST, NO TIMING)
NO GYRO

Motor:

NHX RC 2500kv Sensored

#NHX3010

Battery: 2S Li-Po

Gearing: 53T fixed gearing. The pinion size will be determined prior to the beginning of the next series.  Contact members in Slack for current configuration.

Body:

Any GT/Sedan type lexan body, light or standard weight

NO PANCAR – aka “wedge” or “doorstop” bodies

NO HARD BODIES

Wheel:

20mm max diameter, both front and rear

8.5mm max width front

11mm max width rear

Tires:

Any production rubber Mini-Z tires

NO SILICON, NO FOAM

Weight: NO MINIMUM WEIGHT LIMIT

Should someone purchase a motor made on a Friday, missing a winding that is demonstrably faster than the rest of the field, we will take reasonable action to remedy the situation, to maintain fair competition and race pace.

Chassis:
Open any RWD chassis ONLY, 94mm-102mm Wheel Base ONLY

Motor:
2500kv Sensored

ESC:
BLINKY ESC, Open Gearing,  Sensored ESC (must use physical cable)

Battery:
2S Li-Po battery Maximum Voltage 8.7V. Additional battery for transponder allowed. Option Parts: Open any parts allowed (including homemade parts, 3D print parts and prototype parts). 

Body:
NO LMP Bodies, Must Be Pan Car Wedge Type Body. NO Additional Wings Higher the Sides of Body. (If car is upside down WING SHOULD NOT BE TOUCHING)

Wheel:
All brand Plastic and Aluminum rims are allowed. Maximum Front wheel width is 11mm. Maximum Rear wheel width is 14mm. Maximum wheel diameter is 20mm. All wheel rims must be original design made for Mini-Z RACER, any modification is not allowed, any slot-car design wheel and 3D print wheel not allowed.

Tire:
Any Brand of Rubber Mini-Z production tire ONLY. Homemade tires, Foam tires, Silicon tires, Urethane tires, Ethyl Carbamate tires NOT allowed. No tire insert use. Traction compounds NOT allowed on tire or on race surface. Tire warmers are allowed. Tires may be cleaned with a 70% alcohol solution. If a driver uses tire cleaner that has been deemed illegal, the driver will be subject to any penalties that apply. Please address any questions concerning tire cleaners at the drivers meeting. 

Minimum Weight:
No minimum weight limit. 

Chassis:

1/28 AWD chassis
98 & 102mm wheelbase

Possible options include: Kyosho MA010, MA015, MA020 and MA030, Atomic BZ and SZ, GL Racing GLA, GLA Giulia (with/without Reflex conversion), RTB

ESC:

Open (Sensored wire required)
Must be in, and show blinky mode (no timing/boost)

Motor:

3500kv motor (Maximum Kv 3800)

Battery:

8.4V charging limit on a 2S lipo battery

Gearing:

Open

Body:

Any lexan body, light or standard weight No Pancar (“wedge” or “doorstop” bodies) No hard bodies

Wheel:

20mm max diameter, both front and rear

Tires:

Any production rubber Mini-Z tires No silicon, no foam

Weight:

No minimum weight limit

Lexan | 3500kv | Fixed gear

Please review this class rules on the Rocky Mtn 1/28th Scale Alliance rules website.  You can also connect with other drivers at the Rocky Mtn 1/28th Scale Alliance Facebook Group.