There are advantages to solid professional measuring wheels. A sliding tool box or a shovel in the back of a truck has destroyed the precision of many a spoked wheel. Solid plastic wheels are not nearly as susceptible to these impacts. Also, solid Keson wheels do not go “out of round.” You cannot bend them or flatten a portion of them. Lastly, twigs, sticks, tall grasses and other brush do not get caught up in the spokes or lock these wheels up. If your job takes you through fields or trails, consider a solid wheel option.