Wheel Accuracy

MAXIMUM VELOCITY! ^®

Wheel Accuracy Gauge

Wheel Accuracy = Greater Speed!

Ever wondered if your wheels are truly round? The Wheel Accuracy Gauge eliminates the guesswork, allowing you to pick out the best wheels.

The Wheel Accuracy Gauge measures the "roundness" (known as "runout") of a wheel to within one-thousandth of an inch (.001). A "perfect" wheel will have zero runout, but in general, a wheel is considered to be accurate if the total runout is less than .002.

Each tick mark on the dial of the gauge is .001. When measuring a wheel, the wheel will be rotated one time. The needle of the gauge will generally move both clockwise and counterclockwise from the starting position. The total runout of the wheel is the sum of the clockwise and counterclockwise movement of the needle. A practice wheel with a runout of less than .003 is included. See below for usage instructions.

Features

Easily measure/verify the roundness of stock or machined wheels.

Measures wheel roundness to one-thousandth (0.001) of an inch.

Adjustable for various wheel diameters and tread widths.

How to Use the Wheel Accuracy Gauge

Install Wheel	Slide a wheel onto the pin with the spoke side inwards.
Adjust Dial	Loosen the thumbscrew on the side of the dial, and then rotate the face of the dial until the needle is pointing to zero. Lightly tighten the thumbscrew.
Note Clockwise Deviation Note Counterclockwise Deviation	Rotate the wheel slowly one full rotation, making sure to keep light downward pressure on the wheel (keeping the wheel snug against the pin). Note the number of tick marks of deviation from zero that the needle moves. Add the clockwise and counterclockwise deviation to get total runout. In the photos, the clockwise deviation is 4 and the counterclockwise deviation is 1, so the total runout is 5 thousandths (.005).
	Adjustements As indicated previously, the face of the dial can be rotated so that the needle points to zero. The face is released and locked with the Face Adjustment Thumbscrew. To accommodate a wheel with a significantly larger or smaller diameter, the entire dial can be moved up or down. The dial is released and locked with the Dial Set Screw located on the front of the device - a hex key is provided for this purpose. It is best to measure a wheel in the center of the tread (but, avoid the mold mark on BSA wheels). To accommodate wheels with different tread widths, the pin can be moved in and out. The pin is released and locked with the Pin Lock Nut. Loosen the nut with a wrench or pliers, screw the pin in or out, and then tighten the nut.