Our new Dan Fredrickson inspired Auto-calculating stagger gauge is a cool tool! Our Patent Pending stagger gauge allows you to measure stagger in seconds. Simply measure one tire then hit button to hold that circumference, measure the second tire and the stick will display that circumference and the stagger. This roller version has one solid round end and one rolling round end. This keeps the stagger stick from sticking to hot sticky tires and helps you find the tallest point in the tire.