mousetrap powered car kit

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The Big Cheese
mousetrap vehicle kits | item number: KMTV144DF

The Big Cheese ™ + Ball Bearings

Online Price: $46.95

Availability: This item is currently in stock

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The Big Cheese is an extreme long-distance traveler that illustrates one of the most basic design secret for achieving record-setting travel distances: gearing. For every wrap of string that is pulled from its drive axle, The Big Cheese will travel one full meter of liner distance. The Big Cheese is built on our top selling Basic Kit II chassis but with the added 11-inch drive wheel. The Big Cheese comes ready-to-assemble with pre-cut and pre-drilled parts so you can be ready for action and racing on the same day. As with all our kits, The Big Cheese comes with step-by-step instructions that are filled with tons of top secret performance tips and tricks that have been developed exclusively by Doc Fizzix so that you will have all the information you need to make The Big Cheese a record setter.

Why Doc Fizzix:

At Doc Fizzix, we have been designing, making, and building mousetrap powered cars for more than 30 years. Unlike any other mousetrap vehicle kit you will find on the market today, each of our kits has been designed and tested over and over again to insure your success. We use only the best quality parts and components in our kits. We have been featured multiple times in books, magazines, and national aired programs. We wrote the very first book devoted exclusively to the building of mousetrap vehicle selling more than 200,000 copied world wide. Our kits are used in more schools across the country than any other brand. Mousetrap powered cars and vehicles is our specialty.


  • 11-inch drive wheel
  • Reduced Friction Bearings
  • Adjustable Steering
  • Light-weight balsa wood
  • Brass tubing axles
  • 12-inch brass lever arm
  • Pre-cut and pre-drilled
  • Low inertia DVD layer wheels
  • Doc Fizzix's easy-wind, snag-free propulsion system

Performance Upgrades

Micro-Ball Bearings included in this kit decrease the total amount of friction and increase the efficiency of the vehicle by as much as 50-100% over other conventional bushing systems. Adjustable Steering guarantees that The Big Cheese will travel straight down any hallway. But the single best upgrade is the 11-inch big wheel that travels one meter for ever wrap of string pulled from the drive axle. The total pulling distance for the Big Cheese is about 45 meter before the vehicle begins coasting; that is over 200 times more pulling distance compared to other mousetrap vehicles.

The Big Cheese can be assembled in less than 60 minutes for most first time builders and when finished it will travel from 50-70 meters. The Big Cheese comes with a 12-inch lever arm and an 11-inch drive wheel making The Big Cheese a winning long-distance vehicle.

As with all our top mousetrap racer kits, The Big Cheese includes our "easy-to-wind" and "snag-free " string release system that will not tangle or snag for increased performance, a technique developed exclusively by Doc Fizzix.

Micro-Ball Bearings

Micro Ball Bearings are designed to replace the energy wasting bushing systems with a more efficient ball-bearing system that will reduce the total friction by as much as 50-100%. This means that your vehicle will travel up to 50-100% further and faster than the rest of the competition. Micro-ball bearing also decrease the normal wear that occurs between moving parts and helps eliminate heat build-up so your vehicle can convert more of it's starting energy into increased performance. Micro bearings take a little more work to set-up and are intended only for those individuals who want to set a new school record.


  • reduce friction
  • improves performance
  • decrease wear

Travel distance:

  • 50-70 meters (164 - 230 feet)*

Kit includes the following:

  • Victor mouse trap
  • Kevlar high-tech string
  • Pre-cut and pre-drilled balsa wood frame
  • Low inertia DVD layer wheels
  • DVD wheel adapters
  • Brass tubing axles
  • Thrust washers
  • 11-inch drive wheel
  • Low friction bushings
  • Adjustable steering set-up
  • 12" lever arm
  • Doc Fizzix's easy-wind, snag-free propulsion system
  • Step-by-step plans with performance tips and tricks

Tools required:

  • Needle-nose-pliers
  • Super glue
Size : length = 21 inches, width = 6 inches, lever arm = 12 inches.

Weight : 5.7 oz.

mouse trap car mouse trap car mouse trap car *Kits require assembly, actual results will vary, glue and tools not included.

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Phone Hours: Mon. - Fri. 10:00 a.m. - 5:00 p.m. (CST) - 866-362-3499 (US only) or 512-218-0454
Doc Fizzix Products, P.O. Box 34, Spicewood TX 78669, U.S.A.