Neighborhood Soapbox Derby

Soapbox Specifications & Rules for 2025

Two boy posing with a Soapbox Derby car

Race Day: Sept 13, 2025



Soapbox Derby racing is a distinctive form of gravity-powered competition that highlights ingenuity, teamwork, and creativity. Racers build their cars without motors or engines, relying only on design, weight, and gravity to propel them down the course. This approach keeps the focus on skill and resourcefulness rather than speed from a motor. The experience is exciting for both participants and spectators as each car reflects the builder's ideas and problem-solving abilities. It is an exhilarating event where the laws of physics take center stage and everyone has a chance to compete on equal footing.

Be sure to read the Racer's Guide for additional information and expections.




ELIGIBILITY

Participants will have to complete and sign the 2025 Neighborhood Soapbox Derby Liability Waiver in order to drive/ride in a derby car down the track.

Cars:

Drivers:



COMPETITION CATEGORIES & AWARDS

Racing Classes:

Awards:



CAR SPECIFICATIONS

Construction:

Soapbox cars can be homemade of original design or from a kit. New and used soapbox cars of any age are welcome. Any use of materials is welcome but must be strong and secure, and no sharp protrusions. The car should be built to last the entire morning of racing without continuous breakdowns or repairs.

Wheels:

Ground Clearance:

Brakes:

  • Functioning hand or foot-controlled brake is required.
  • Drivers may not use their feet on the pavement or tire to stop the car.
  • Brake pads must not have protruding hardware that could damage the racing surface.
  • - We are not specifying the type of braking mechanism to use. For ideas and examples, contact Jason.

Steering:

Enclosures and Hatches:

Turnbuckles and Fasteners:

Weight:



SAFETY EQUIPMENT

Helmets:

Gloves, Suits, and Goggles:

Shoes:

Other:



INSPECTION AND DISQUALIFICATION

To run cars down the track, all participants must complete parental/guardian and/or personal liability waivers. Inspections are required for any cars that will be used on the track to ensure the safety of both participants and spectators.

We require you to have your car inspected before race day. Inspections can be coordinated through the Derby Committee Chair, Jason Hoyt (jason@hoytlink.com). This will help the event run smoothly and prevent any disappointment on race day. We would hate for your car to be disqualified at check-in for being out of compliance.

After inspection, any vehicles found to be out of compliance, may be repaired or modified. If your car's issues are not corrected before race day, the car will be disqualified. In such cases, if the team can find a different car to use on the day of the race, that is complying with all requirements, then drivers will have the option to use it for the race.

If you need to make any last-minute adjustments to the steering or brakes, please do so before proceeding to the starting line. If your car isn't ready when your its called to the starting line, you forfeit that heat.

Practice runs are permitted only until 20 minutes prior to the main event. Additional, you and your car must be checked in and with your wavier on file before taking practice runs.



SUMMARY OF SPECIFICATIONS

  • Max Length: 84 inches
  • Max Height: 32 inches
  • Max Overall Width:
    • Single Seater: 36 inches
    • Double Seater: 48 inches
  • Ground Clearance:
    • Min: 3 inches
    • Max: 6 inches
  • Front Axle Width:
    • Min: 20 inches
    • Single Seater Max: 36 inches
    • Double Seater Max: 48 inches
  • Max Axle Protrusion: 1 inch
  • Wheelbase (Front Axle to Rear Axle):
    • Min: 32 inches
    • Max: 48 inches
  • Max Car Weight: 100 lbs

Part of the Derby experience is to see what you can come up with under these constraints. Though if a rule seems overburdensome, you can petition the Derby Committee Chair, Jason Hoyt (jason@hoytlink.com) and plead your case. Being the first year of this derby, a certain case can be made that the rules are too restrictive. Though they seem to the Race Committee to be inline with other derbies of this style (Red Bull derbies are a whole different thing). There are items that won't be negotiatable, particularly anything to do with overall safety of participants and spectators.

Be sure to read the Racer's Guide for additional information and expections. Complete the 2025 Neighborhood Soapbox Derby Liability Waiver in order to participate.


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