Axles Speed Performance Simulator

Select Axles and see how they affect performance

How To Build a Fast Car

Our cool pinewood derby Car Designer with Speed Simulator* helps you choose products by showing the "relative speed" difference between products. Select car parts, read the performance notes, and watch the speed improvement of your car as it races to the finish line.

Your Car's Speed Rating*: 0


  • Click a Product to add it to your Product List and watch your car move to the checkered flag.
  • Read Performance Rating to see how that product affects your car's speed.
  • Click Remove Product to remove it.

  • What are the Performance Ratings?
    A fun tool that simulates the performance of our products. To see actual track-tested speed ratings, see our Speed Tests.

    What is your Product List?
    Your Product List (upper left column) conveniently tracks the products you selected. It is NOT your Shopping Cart. When done, click on Add to Cart for each product you would like to purchase.

    Rules Notes:

    • Axles are exact dimensions of BSA axles but they are machined parts. May not be legal in your race.
    • Rules are different for every race! Always read your race rules.
    • Questions? Ask your race manager!

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    Performance Rating

    Axles are important to making a fast car because friction between the wheels and the axles will slow down your car! Our axles make your car faster with options such as a groove to reduce friction, graphite coating, and axles polished to perfection.


    * The "Speed" of the animated Race Car does not correlate to the speed of your car on the track. It just gives you an indication of the "relative speed" between products. Our Speed tests lists the actual track speed measurements.

    How Axles Make All the Difference

    To build the fastest car, you need to minimize friction. Friction between the axles and the wheels is the biggest factor in slowing down your cars. With this tool, you can customize axles and wheels to create your own car with as little friction as possible. Less friction = More speed, and speed is what wins races.

    Axle Tips and Speed Hints

    When your wheel rubs against the axle head it can cause the wheel to wobble because the corner of the axle head is not a perfect 90 degrees. Cutting a groove directly under the axle head removes this source of wheel wobble, but it is difficult to do by hand. Consider our Grooved Speed Axles that have a groove cut directly under the axle head.

    The stock BSA "nails" that come in your kit are mass produced. These nails have burrs, crimp marks and can also be crooked, all of which severely limits your car speed. An Axle Polishing Kit and Axle File are essential to fix your axles and increase your car speed.

    The axle slots that are cut into standard blocks are too tight for your .089" diameter axles. Small axle slots make it difficult to get your axles in straight. A #44 drill bit is .086", which I find too tight. Consider a #43 Drill Bit, which is a perfect match at .089" for a snug fit.

    Using the Pinewood Derby Car Designer

    Select your Axles and watch the little car advance toward the checkered flag.

    • Choose axles based on performance and your race rules.
    • PRO Axles have our exclusive graphite-coating giving you the highest performance

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    • Your Product List

    Add to Cart!