Mini Z Club Racing Rules

Welcome to the fastest club race this side of the Kern River...1/28 scale Mini Z Racing!

Here are at the hobby gym we adhere to the 28SRA rules. We currently offer the following classes

Box Stock

BOX STOCK CLASS REGULATIONS

DRIVER RESTRICTIONS

  • Lipo 3500, 2wd Mod, AWD Mod, Lipo 2500 Pan, or Open Pan drivers are not permitted in Box Stock class.

CHASSIS

  • Allowed: Kyosho MR03S, MR03S2, MR03 RTR, MR04 RWD, Associated SR27 (RWD only)
  • Not Allowed:Shaving chassis or removing sections for weight reduction
  • Chassis must be raced as manufactured from the box

WHEELBASE

  • Only allowed wheelbases: RWD 90mm, 94mm, 98mm, and 102mm

MOTOR & ESC BOARD

  • Kyosho MZ9P, MZ9E Motor from RWD RTR
  • Permitted modifications:
    • Changing motor wires with same or maximum (20) gauge wire 
    • Removing safety switch
    • Motor must be run as manufactured with no other manipulations or modifications
  • Not Permitted: EVO Board or other upgraded board

GEAR RATIO

  • 6T - 9T Pinion (included with RTR kits)
  • Stock Kyosho Gear Diff only

WHEELS

  • All brand plastic and aluminum 1/28 scale production wheels allowed
  • Size limitations:
    • Maximum front-wheel width: 8.5mm (not including outer flange/disk)
    • Maximum rear-wheel width: 11mm (not including outer flange/disk)
    • Maximum wheel diameter: 20mm
    • Minimum wheel diameter: 19mm
  • Wheels must be original designs made for 1/28 scale cars
  • Wheel and tire must fit inside the body

TIRES

  • Maximum tire diameter (mounted): 25.5mm
  • Front tires must be 8.5mm and rear tires 11mm
  • Not Allowed:
    • Traction compound on tire or race surface
    • Tire warmers
    • Homemade tires
    • Foam tires
    • Silicon tires
    • Urethane tires
    • Ethyl Carbonate tires
    • Tire inserts
  • Tires may be cleaned with 70% alcohol solution or water
  • Using illegal tire cleaner will result in penalties
  • Direct tire-related questions to the driver's meeting or race director

BATTERIES

  • Cars must be powered by 4 AAA batteries
  • Allowed types: Alkaline, Ni-MH, or Ni-Cd
  • An additional battery is allowed only for transponder connection

ELECTRONICS & TRANSMITTER

  • Stock Radio from RTR Kit
  • Only Kyosho original items included in the RTR box are allowed
  • No modifications to radio permitted

BODY

  • Any manufactured molded hard shell that fits the allowed wheelbase
  • All parts must be original for that body
  • Limited wheel and ground clearance modifications allowed
  • Size limitations:
  • Maximum body length: 180mm
  • Maximum width: 83mm
  • Not Allowed:
    • Shaving/thinning body material for weight reduction
    • Lexan roofs, windows, and wings
  • Headlight requirements:
    • Original headlight covers must be installed
    • Headlight buckets may be removed/omitted
    • Lost headlight covers may be replaced with decal/tape
  • Taillights and covers may be removed/omitted
  • Small body parts (mirrors, canards, exhausts, front splitters) may be omitted to prevent racing damage
  • Wings: Standard rear wings for corresponding hard-shell body may be used with no height limit
  • Custom aftermarket plastic wings must meet 45mm height limit from ground

OPTION PARTS

  • Allowed from any manufacturer: bearings, wheel nuts, springs, and T-Plates
  • Only original Kyosho front and rear suspension parts may be used
  • No added weight via tungsten, brass, or other materials

MODIFICATIONS

  • King pin flip allowed, lower pin must be shortened to no damage track