I'm trying to convince the HOA to let us use Stand-Ons but I would imagine the PSI is allot greater than the currently required Walkbehinds. The last crews used small 36" ZTR's and the rutting was unacceptable. All of the lawns are irrigated and very small so the turf is often soft and altering cutting patterns can be very difficult on the narrow yards. I know I can figure it out by using the specs but I thought there might be a standard PSI spec sheet floating around here that I could use. Obviously oporator weight is variable on the rider and Stand-On but I would take an average of 180lbs.