Racing Rules for Derby Cars made from LEGO® Bricks

Car Weight

  • Maximum car weight shall not exceed 5.0 oz
  • The 2x2 Zinc Brick (.44oz) is the best weight for Derby cars made from LEGO® bricks because it can simply be snapped on like any LEGO® Brick.
  • For open class racing, the weight limit is at the disgression of the Race Manager

Derby Car Dimensions

  • Max Height: 4.5" - so the car clears the finish gate.
  • Max Width: 3" - so the car does not interfere with the car in the adjacent lane
  • Max Length: 10" - so the car fits behind the start gate
  • Bottom clearance: 3/8" - so the car doesn't rub on the track center guide rail.

Derby Axles and Wheels

  • PRO Brick Wheel Assembly or PRO Brick Chassis must be used to get precise wheel spacing for a pinewood derby track.
  • All four wheels do not need to be in contact with the track; however, each car must have four wheels.


Lubrication is not allowed.

Car Modifications Not Allowed

  • Wheel bearings, washers or bushings are prohibited.
  • The car must not ride on any type of springs.
  • So called "cheater bars" at the front of the car to give an unfair starting advantage are prohibited.
  • No starting or propulsion devices.
  • The car must be freewheeling.

Other Race Rules

  • Each car must pass inspection by the official inspection committee before it will be allowed to compete.
  • Any modifications not expressly forbidden by any of the rules above, are allowed, subject to final decision by a race official.
  • The Inspection Committee may disqualify any car that does not meet the above specifications.

Car Repairs

  • If pieces fall off the car, (common in Brick Derby car races!), the racer will have 5 minutes to put pieces back on the car.
  • No additional pieces may be added when the car is repaired.