For a wheel to perform properly, it is important for the rim to be centered between the locknuts of the hub, or "dished". To check this, and to make precision adjustments, a wheel alignment gauge (also called a dishing tool) is a must. The new WAG-4 allows easy checking of the dish on road, mountain, BMX wheels, and others from the 16-inch wheel-rim to 29-inch wheel-rim, and even the 27 inch wheel-rim. It works with any hub width and its innovative design allows it to be accurately used with even a wide tire and a quick release skewer still on the wheel. The WAG-4 will in many cases allow the dish to be checked with the wheel still mounted in the bike. 1.7 lbs.