Pinewood Derby Wheel Inspection Gauge Go / No-Go


In stock

Our Wheel Go/No-go gauge will help you improve your race by providing a consistent and quick way to inspect pinewood derby wheels while the wheels are mounted on the car.  Inspection is a breeze once you understand how to use this tool and there will be no arguring about caliper bias.

Please do not try and force the wheel between the tongs. Simply try to pass the gauge through the wheel from the bottom up. If the wheel does not pass through then the wheel PASSES inspection. If the wheel is able to pass through the tongs, then it fails that measurement.

Weight reduced wheels are very pliable and thus calipers will make them fail every time.  Bring one of these guides on race day to ensure you do not get D/Q because of measuring bias.  If a car is built with wheel wells (fenders) , the OD gauges cannot be used (of course a digital caliper cannot be used in this situation either).  Be prepared.

  • No Wheel Modification Allowed – If the wheels may not be sanded or modified in any way, then use the 1.180 OD gauge and the .360 width gauge.
  • Wheel Modification Allowed – If the wheels may be sanded or lathed, then use the 1.170 OD gauge and the .320 width gauge unless otherwise stated by your packs rules.

In stock


Pinewood Derby Wheel Inspection Gauge

We’re going to bring back a fan favorite pinewood derby tool – the Pinewood Derby Wheel Inspection Gauge.

What Does The Pinewood Derby Wheel Inspection Gauge Measure?

It measures two variables each with two very different ranges.

  1. The overall diameter of the wheel.
  2. The cumulative wheel width.

What Makes The Pinewood Derby Wheel Inspection Gauge So indispensable?

    • Constructed out of cast acrylic (to bring the costs down).
    • Cast acrylic is a durable alternative to its metal predecessor.
    • It’s laser cut and engraved for a smooth sanded finish.
    • Comes with paper affixed to plastic to reduce premature scratches.  You may leave on or remove.  I like it to be honest.

How To Use Derby Wheel Gauge For Outer Diameter

Wheel Diameter – Accurately and quickly verifies compliance with a 1.170 inch and 1.180 inch wheel diameter specification. Just gently attempt to slide the gauge over the wheel. If the gauge will not slide over the wheel, then the wheel complies with the specification. If the wheel almost fits into the gauge, try again at a different spot on the wheel.

A factory width wheel will not pass through the 1.180″ channel.  Any wheel that does, has been altered past factory diameters.  If rules state 1.170″ is the given minimum diameter for “worked” wheels,  a wheel that passes through the 1.170″ portion fails.

The proper way is to simply “wand” the Pinewood Derby Wheel Gauge over a wheel.  If the wheel is smaller than the selected diameter, the wheel will pass through without issues.  If the wheel does not pass through then that means the wheel is LARGER than the selected diameters.  When you try and force the tool on the wheel, weight reduced wheels have enough “give / flex” in them to actually be squeezed inside measurement thus making them fail the inspection.  Improper use of the tool is why the wheel failed, not because the wheel failed.

How To Use Wheel Measuring Tool For Width

This is used to determine if too much material has been removed while “truing” the edge of the wheel for concentric and for a reduction in surface area to reduce friction.  A near factory width wheel will not sit flush into the .360″ portion of the wheel.  If it passes through the tongs, it fails.  .320″ is usually the accepted minimum width for worked wheels.

The gauge measures the overall width of the wheel including the sidewall. The tread patch is not measured by itself, as it is not easily measured on most wheels. When measuring the wheel width, measure at a point on the wheel where there is no raised lettering.

This wheel gauge is the preferred measuring guide even vs very expensive calipers for the same reason.  The simple squeezing of calipers will cause incorrect measurements of weight reduced wheels.

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YouTube Video on how to use:


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