We have an older LandPride FDR1660 and if the grass is 10" or taller, and slightly wet, it will leave windrows. If we take it slower, and cut 2/3 width it does fine. When the grass is dry, no matter what it is a cutting sob and the lawn/fields look great. The mower is 15-20 years old. Still on the original spindles, solid rubber tires instead of the may go flat tubeless.