Mine is a stationary saw. I have 2 round bailer belts laced together as I didn't want to have to spend $20 to cut one to size and have it relaced. The belt s is total 40ft from tractor pulley to Saw pulley. I have a 48 H Farmall, but I don't use it on the saw as my granddads 34 CC Case has higher rpm and more hp. I used the long belt for the first time last year and I think it somehow takes up the jerks one may get in the saw. It tends to run more smoother, with less wanting to run out on the end in a tough cut. The saw was my granddads wedding present to my dad in 1940. They didn't have a tractor then, but likely ran it off of a portable engine, as dad said they had had one once.