This class is for beginners and runs on Box Stock car rules.

Who Can Enter
– Beginners only
– Novice drivers may enter Novice only, not any other class that night
– Moving up out of Novice is the race director’s call
– Class may be run in trainer mode (50%) or full speed (100%) based on class decision and Race Director confirmation

This class is an unaltered MR-03/MR-04 Mini-Z, as it comes in the ReadySet box.

Motor
– Unaltered “white cap” motor (brushed; not Kv tested)
– Capacitors and PTC must remain on the motor
– Motor wires may be changed for silicone-insulated replacements, 20 gauge max

Batteries
– 4x AAA NiMH, max 1.55V each, max 6.2V total
– All NiMH accepted

Electronics
– Stock ReadySet board or direct replacement (no EVO or upgraded boards)
– Safety switch may be removed
– Any radio that binds to the stock Kyosho board

Drivetrain
– Gearing must be out of the ReadySet kit
– Unaltered stock Kyosho gear diff

Chassis/Suspension
– Unaltered chassis and motor pod
– Stock Kyosho front springs, T-plate, top “shock” and top spring
– Any damper grease or oil allowed in the stock top shock
– No added weight
– Repair and durability replacements must be Kyosho parts matching the original (same geometry and function), any material

Body and Wheels
– Any Auto Scale or Auto Scale-like hard body, 90/94/98/102mm wheelbase
– Max length 180mm, max width 83mm
– No shaving or thinning; no Lexan roofs, windows or wings
– All major body parts must be installed, including headlight lenses and buckets
– MR-03: kingpin flip allowed if trimmed so it can’t damage the track
– Jomurema, PN Concept and Reflex bodies not allowed
– Aftermarket wheels allowed

Tires
– Any RCP-safe tire
– Front max 8.5mm wide, rear max 11mm wide
– Tire cleaning allowed with water, isopropyl alcohol or tape
– Tire prep/compound/sauce/’wash’ prohibited
– Tire warmers prohibited

Helpful Tips
– Recommended tires to replace the ones in your ReadySet kit:
– Kyosho Racing Tires, 20/30 compounds
– Marka V1 10/15 for the rear
– PN Racing KSM soft and medium compounds

This class is an unaltered MR-03/MR-04 Mini-Z, as it comes in the ReadySet box. If you are registered in any LiPo class at an event, you can’t enter Box Stock at that event.

Motor
– Unaltered “white cap” motor (brushed; not Kv tested)
– Capacitors and PTC must remain on the motor
– Motor wires may be changed for silicone-insulated replacements, 20 gauge max

Batteries
– 4x AAA NiMH, max 1.55V each, max 6.2V total
– All NiMH accepted

Electronics
– Stock ReadySet board or direct replacement (no EVO or upgraded boards)
– Safety switch may be removed
– Any radio that binds to the stock Kyosho board

Drivetrain
– Gearing must be out of the ReadySet kit
– Unaltered stock Kyosho gear diff

Chassis/Suspension
– Unaltered chassis and motor pod
– Stock Kyosho front springs, T-plate, top “shock” and top spring
– Any damper grease or oil allowed in the stock top shock
– No added weight
– Repair and durability replacements must be Kyosho parts matching the original (same geometry and function), any material

Body and Wheels
– Any Auto Scale or Auto Scale-like hard body, 90/94/98/102mm wheelbase
– Max length 180mm, max width 83mm
– No shaving or thinning; no Lexan roofs, windows or wings
– All major body parts must be installed, including headlight lenses and buckets
– MR-03: kingpin flip allowed if trimmed so it can’t damage the track
– Jomurema, PN Concept and Reflex bodies not allowed
– Aftermarket wheels allowed

Tires
– Any RCP-safe tire
– Front max 8.5mm wide, rear max 11mm wide
– Tire cleaning allowed with water, isopropyl alcohol or tape
– Tire prep/compound/sauce/’wash’ prohibited
– Tire warmers prohibited

Helpful Tips
– Recommended tires to replace the ones in your ReadySet kit:
– Kyosho Racing Tires, 20/30 compounds
– Marka V1 10/15 for the rear
– PN Racing KSM soft and medium compounds

One-Make Class, Similar to (but not the same as) Kyosho’s Wide Touring
Class. ALL PARTS MUST BE MANUFACTURED BY KYOSHO or R246

Motor

• Unaltered “Black Cap” motor Required (Kyosho MZW301 or MZW301E)
• Capacitors and PTC must remain unmolested
• Motor wires MAY be changed for silicone-insulated replacements

Batteries

• 4x AAA NiMH, Max Voltage 1.55V each, Max 6.2V Total
• Any Brand/Model

Electronics

• Any Kyosho Manufactured Evo or Box-Stock Board
• Transmitter: Open

Drivetrain

• Kyosho Manufactured gear or Ball Differential with 0.5M 44T Spur
• Kyosho Manufactured 6T, 7T, 8T, or 9T Pinion

Chassis/Suspension

• Kyosho MR03/MR04 Chassis
• Any Kyosho or R246 Manufactured motor pod, springs, T-plates, dampers
• All brass chassis weights

Upgrades

• Any Kyosho or R246 Manufactured upgrades are permitted

Body

• Any Kyosho ReadySet OR MZP* Auto Scale body MZN* White-Body kit
• Windshield, Headlight lenses, and Taillight lenses are required
• Lexan Windows and Roofs are not permitted.

Tires and Wheels

• Any RCP-Safe tire is permitted
• Front Tire Height <21.9mm and >24.7mm
• Rear Tire Height not to exceed 24.7mm
• Tire cleaning allowed with water or isopropyl Alcohol
• Tire prep/compound/sauce/’wash’ prohibited

Helpful Tips

• coming soon 

Minimum fast-lap
– The race director may require a driver to show a fastest single lap within 1.2x the class record for the current track layout (example: if the class record is 6.1 sec, the driver must be faster than 6.1 x 1.2 = 7.32 sec)

Motor 
– 3500Kv brushless motor, run sensorless (no sensor wires), 15mm max can, must tech at or below 3800Kv on the HobbyWing Motor analyzer
– Kyosho Black Cap brushed motor, no Kv limit
– PN 70 turn brushed motor, no Kv limit

Batteries
– 4 AAA cells in series (alkaline, NiMH or NiCd), 6.20V total maximum
– One extra AAA cell allowed for the transponder only

ESC
– Kyosho or Kyosho-style flat board (single-board ESC/receiver)
– Gyros prohibited (built-in or separate)

Drivetrain
– 3500Kv motor: 14T pinion and 53T spur
– Kyosho Black Cap: Kyosho gearing only
– PN 70 turn: final drive ratio open

Chassis
– Wheelbase 98mm to 102mm
– Maximum width 83mm
– Minimum race weight 160 grams
– Tires must not protrude beyond body work

Body
– 1:27-1:28 scale molded hard body
– Minimum weight: 24g
– Lexan body prohibited
– Lexan replacement windows and roofs are permitted
– Headlight lenses and windows must be installed

Tires
– Front tire width not to exceed 8.5mm, rear not to exceed 11mm (measured without the wheel’s outer disk or flange)
– Maximum mounted tire diameter: 25.5mm
– Must be approved for use on RCP
– Silicone Tires Prohibited
– Foam Tires Prohibited
– Tire Prep/Compound/Sauce/’Wash’ Prohibited
– Tire warmers prohibited
– Glue used to mount the tire to the wheel is allowed
– Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape

Minimum fast-lap

Driver and Car may be required to demonstrate competence to lap the track within 1.2x the class-record in order to race in this class (example: if the class record is 6.1sec then the driver must be faster than 6.1 x 1.2 = 7.32sec).

Motor

• 5500kv Brushless motor.
• Must Tech Below 5800kv with onsite tech director

Batteries

• 4x AAA NiMH, Max Voltage 1.55V each, Max 6.2V Total

ESC

• Open

Drivetrain

• Final Drive Ratio: Open

Car Dimensions

• Wheelbase not to exceed 102mm
• Tires must not protrude beyond bodywork

Body

• Any Lexan GT body

Tires

• Any RCP-Safe tire is permitted
• Front Tire Width not to exceed 8.5mm
• Rear Tire width not to exceed 11mm
• Tire cleaning allowed with water or isopropyl Alcohol
• Tire prep/compound/sauce/’wash’ prohibited
• Silicone Tires Prohibited
• Foam Tires Prohibited

Based on the 28SRA Lipo 2500 rules, with the Iowa differences below. Where this section and 28SRA disagree, this section wins.

Minimum fast-lap
– The race director may require a driver to show a fastest single lap within 1.15x the class record for the current track layout (example: if the class record is 5.9 sec, the driver must be faster than 5.9 x 1.15 = 6.79 sec)

Motor
– Any 1/28th scale manufacturer 2500Kv sensored motor
– Maximum can diameter: 15mm
– Must tech at or below 2800Kv
– No aftermarket rotors allowed
– Motors must not be tampered with or modified

Batteries
– 2S LiPo, or two 1S cells in parallel, max racing voltage 8.40V

ESC
– Any 1/28th scale sensored ESC in blinky mode (0 timing, no boost or turbo, blinking LED visible)
– Punch, drag brake, and throttle curve settings are allowed and do not count as timing
– Gyros prohibited (built-in or separate)

Drivetrain
– RWD
– 53T spur with a 14T pinion ≈ 3.786:1
– Gears must be pre-event teched and marked

Chassis
– Wheelbase 98mm or 102mm
– Maximum Width 83mm, Maximum Length 180mm
– Minimum race weight 160 grams
– Tires must not protrude beyond body work

Body
– Any molded plastic (ABS) hard body
– Minimum weight: 24g (not including mounting system)
– Lexan windows, roofs, and wings are permitted
– Standard rear wings for the matching hard body: no height limit
– Custom aftermarket plastic wings: 45mm max height from the ground

Tires
– Front tire width not to exceed 8.5mm, rear not to exceed 11mm (measured without the wheel’s outer disk or flange)
– Maximum mounted tire diameter: 25.5mm
– Must be approved for use on RCP
– Silicone Tires Prohibited
– Foam Tires Prohibited
– Tire Prep/Compound/Sauce/’Wash’ Prohibited
– Glue (including CA) used to mount the tire to the wheel is allowed
– Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape

Minimum fast-lap
Driver and Car may be required to demonstrate competence to lap the track
within 1.15x the class-record in order to race in this class (example: if the class record
is 5.9sec then the driver must be faster than 5.9 x 1.15 = 6.79sec)

Motor (2s LiPo, LiIon)

• 2500kv Brushless Motor.
• Must Tech Below 2800KV

Batteries

• Lithium Polymer or Lithium Ion batteries wired in 2s, or 2s,2p, for a maximum
  total voltage of 8.40v

ESC

• Open

Drivetrain

• RWD – Open Drive Gearing

Car Dimensions

• Maximum Width 80mm, Maximum Length 160mm
• Wheelbase not to exceed 102mm
• Tires must not protrude beyond body work

Body

• Any Pan Body or LMH Lexan Body permitted

Tires

• Tire width not to exceed 11mm
• must be approved for use on RCP
• Silicone Tires Prohibited
• Foam Tires Prohibited
• Tire Prep/Compound/Sauce/’Warsh’ Prohibited
• Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape

This class is kept a little looser than 28SRA so parts are easier to find.

Minimum fast-lap
– The race director may require a driver to show a fastest single lap within 1.15x the class record for the current track layout (example: if the class record is 5.9 sec, the driver must be faster than 5.9 x 1.15 = 6.79 sec)

Motor (2S LiPo, Li-ion)
– 3500Kv brushless motor
– Must tech at or below 3800Kv on the HobbyWing Motor analyzer

Batteries
– LiPo or Li-ion, wired 2S or 2S2P, max racing voltage 8.40V

ESC
– Sensored ESC only; sensorless ESCs not allowed
– Must be in blinky mode (no turbo or boost timing)

Drivetrain
– RWD
– 53T spur with a 12T pinion ≈ 4.42:1, any 1/28 maker

Chassis
– Maximum width 83mm, maximum length 180mm
– Wheelbase not to exceed 102mm
– Minimum race weight 160 grams
– Tires must not protrude beyond body work

Body
– Any Lexan GT or sedan body permitted
– LMP and pan-car style bodies prohibited
– Wings 45mm max height from the ground

Tires
– Front tire width not to exceed 8.5mm, rear not to exceed 11mm
– Maximum mounted tire diameter: 25.5mm
– Must be approved for use on RCP
– Silicone Tires Prohibited
– Foam Tires Prohibited
– Tire Prep/Compound/Sauce/’Wash’ Prohibited
– Tire warmers prohibited
– Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape

Minimum fast-lap
Driver and Car must be able to lap the track within 1.15x the class-record in order
to race in this class (example: if the class-record is 6.1sec then the driver must
be faster than 6.2 x 1.15= 7.13sec).

Motor

• Open Brushless Motor (Modifications Prohibited)

Batteries

• Lithium Polymer or Lithium Ion batteries wired in 2s, or 2s,2p, for a maximum
  total voltage of 8.4v

ESC

• Any Sensorless Brushless system permitted
• Any Sensored Brushless system permitted in ‘blinky mode’ (no boost or turbo
  timing)

Drivetrain

• Shaft or belt driven AWD
• Final Drive Ratio: Open

Car Dimensions

• Max Width: 80mm
• Max Length: 180mm
• Max Wheelbase: 98mm
• Tires must not protrude beyond body work

Body

• GT-Style Lexan or Kyosho-Style Hard-Body

Tires

• Tire width not to exceed 14mm
• must be approved for use on RCP
• Silicone Tires Prohibited
• Foam Tires Prohibited
• Tire Prep/Compound/Sauce/’Warsh’ Prohibited
• Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tape

Chassis

• Any Formula 1 Racing Chassis, such as GLF-1, MWX Formula 1

Motor

• 2500kv Brushless Motors
• Must test @ 2800KV or below in accordance with test procedures provided by race director.

Batteries

• Lithium Polymer batteries wired in 2s: maximum total voltage of 8.4v

ESC

• Any Sensorless Brushless system permitted
• Any Sensored Brushless system permitted in ‘blinky mode’ (no boost or turbo
  timing)

Drivetrain

• Final Drive Ratio: 53:13 ≈ 4.08:1

Car Dimensions

• Overall Width: Not to differ from stock
• Wheelbase: 114.0 ± 1 mm
• Overall Length: Within 3 mm of stock

Body

• Body Kit: GLF-S-001
• Alternate front spoiler and/or rear wing are acceptable provided they adhere to
  the following:
• Cannot cause the car’s overall length to violate 7,H,iii
• Mounting to the same point as stock parts,
• Front Spoiler max height not to exceed 12mm
• Rear Wing Max Height not to exceed 50mm
• Total Combined Frontal Area of all alternate or altered parts are not to
  exceed 2500mm2
• Total Combined Wetted Area of all alternate or altered parts are not to
  exceed 10000mm2

Wheels and Tires

• Front Wheel: GLF-S-003
• Rear Wheel: GLF-S-004
• Front Tire: GF0001-S21, GF0001-S23, GF0001-S25, or GF0001-S27
• Rear Tire: MZR-V1R05-F1-GL or MZR-V1R10-F1-GL
• Tire Prep/Compound/Sauce/’Warsh’ Prohibited
• Tire Cleaning Allowed With Pure Water, Isopropyl Alcohol, or using Tap

Hard bodies may be modified for function as long as the outside look is barely changed.

Allowed modifications include (not a complete list):
– The rear bumper may be cut down to no less than 20mm from the ground.
– Wheel wells may be cut or chamfered inside for tire clearance.
– Lower edges of the body may be cut for ground clearance in front, sides, or rear.
– Body panels may be reinforced inside without changing the outside look.
– Original headlight covers must be installed; headlight buckets may be removed. A lost headlight cover may be covered with a decal.
– Taillights and taillight covers may be removed.
– Small parts such as mirrors, canards, exhausts, and front splitters may be removed to prevent racing damage, rail snags, and track debris.
– Stock rear wings that came with the hard body may be used at any height. Aftermarket plastic wings are allowed on any shell but must be cut to 45mm max height from the ground.
– Box Stock exception: no shaving or thinning, and no Lexan roof, windows, or wings (see Box Stock).

The spirit of the rule is that body mods may improve performance but must keep the scale look. The tech inspector has final say on body legality. If you’re unsure about a mod, bring the body to tech BEFORE qualifying or mains to avoid a DQ. Tech may photograph the body in its legal state.

If you change the body further after tech, or it gets badly damaged, bring it back to tech right away. A body judged illegal must be repaired or replaced before the next round. Results from a round where racing damage happened still count, unless the body was built to break away on purpose for a performance gain.

Lexan Bodies

Aftermarket Lexan, molded plastic, 3D printed, and carbon wings are allowed. Max wing size can’t be bigger than the original wing cutting line. The rear bumper may be cut down to no less than 20mm from the ground.

Approved Lexan GT Bodies
(Examples. 3500 GT allows any Lexan GT or sedan body.)
– PN – Supra A90, JSK, AD4, GT4LB, 992GT3, M4GT3, Concept C9, V2 JGT01, ZLB
– SBRC – Zenvo ST1, Phenom GT, NSX GT3, 458GT, SBX, STR, HYR, JX, XB2
– Marka – RK410, RK408, RK-S, RK-SP6, RK-HC, RK-P-One, RK-W, RK-12, RK-TWR, RK-4C, RK-AMGT, RK-BLD, RK-NTI, RK-PZR, RK-MK4
– Atomic – M4Z, DBX, Hyper, VST, ADR, IS2, LTC Type, LCT-2.0, AMZ
– GL Racing – P1M
– Rad Body – Mako GT, Mako X, Mako X2, Catfish
– PROTOform – P63, Venturi GT
– G-Force – VW
– RTRC – XVR-GTB
– Bitty Designs – Ares-1, Eptron
– Nexx Racing – NX-326
– 102mm wheelbase only – GL Racing P1M, Marka RK-P-One, RTRC XVR-GTB

Approved Lexan Pan Car and LMP Bodies
Cutting the rear panel is allowed.
– PN – BMR, AMR2
– Marka – RK-AMR, RK-P99, RK-LM6
– Atomic – MP1
– SBRC – B001, B011
– Rad Body – LMP3, Ocho, Skillet
– 102mm wheelbase only – Atomic MRZ, GL Racing VDS

Approved Lexan 112mm-116mm Bodies
– GL Racing – GLF-1
– PN – F1 body #600821
– G-Force – G-Force formula body
– LMP/LMH – GL Racing GLF1 LeMans

If a body isn’t listed, it may still be legal. Check with the race director before the event for a final answer.

– New parts must be publicly available for 45 days before they’re legal (28SRA).
– Publicly available means announced on social media or a website AND available to buy nationally.
– Prototype parts are not allowed.
– 3D print files must be shared publicly at least 30 days before the event, so anyone can print them.

Motor tech procedures

– All brushless motors run in Lipo Stock, AAA Sportsman (3500 motor), 3500 GT, and F1 must be pre-event teched and marked.
– Brushed motors (Box Stock, Novice, AAA Black Cap, and PN70) are not Kv tested.
– Recommended: motor unsoldered and sensor wire removed before testing.
– Testing method: HobbyWing Motor analyzer (set to manual test option, Kv analyzer, full throttle). The same equipment is used at all events for consistency.
– The motor must read AT OR BELOW the class limit, with no tolerance.
– A motor that reads over is retested twice, and the lowest of the three readings counts. The tech official’s reading is final.
– A failed motor can’t be used that event.
– A brand-new motor that fails pre-event tech may be swapped before racing with no penalty.

The race director or tech inspector can tech any car at any time, for any reason (weight, size, Kv, gearing, tires, or voltage before the race).

– Pre-event is any time before the first race.
– Any driver may submit a car to check that it’s legal.
– Lipo Stock, AAA Sportsman, 3500 GT, and F1 entries must pre-event tech all motors, pinions, and spurs they’ll run. Those parts are marked for quick checks later.
– Box Stock and Novice: visual check.

– No impound table.
– Cars are checked at random, or when a car is protested (it goes to impound and is checked between rounds).

– A technical violation is a DQ from that round. The driver may fix the car and race the next round if it passes tech.
– Refusing tech is a DQ from the event.

Any driver in the same class may protest a car to the race director/tech inspector right after the race, before the next race starts. There is no protest fee. The protested car goes into impound and is checked between rounds with its owner present. The protester’s car may be checked too. Refusal to produce your car will result in DQ. The race director’s ruling is final for the night. Appeals go to the rules board within 7 days.