If you're looking to measure a long distance quickly, then a rolling distance Measuring Wheel is the tool for you. Measuring wheels come in various sizes (wheel diameter) and units of measure. Some measuring wheels fold so they are compact when storing in car or truck, or in a tool box. Measuring wheels with a 6" to 12" diameter are typically used indoors on carpet and tile, and even concrete, mostly smooth surfaces. Larger wheels that are bigger than 12" diameter are mostly used outdoors on turf, ground, asphalt and gravel. Their larger wheels allow for rolling over the rougher terrain that is generally found outside.