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Message: <blockquote data-quote="500K_773" data-source="post: 1190" data-attributes="member: 33"><p>I would go at least as wide as from outside tire to outside tire. My tire width is 71" and I only have a 60" Brushcat. This makes it somewhat difficult in heavy brush, but not unbearable. You auxillary hydraulic flow and whatever hydraulic motor you get will utimately determine your maximum diameter. You need to have enough power and speed to keep the blades turning in the biggest brush you want to cut. Heavy blades will have more mulching power, but will also take more hydraulic power to spin. A larger diameter blade pattern will have faster blade speeds at the tip than a smaller diameter, but will have more rotating mass and the long blade will slow/stall your pump easier. You are planning direct hydraulic drive, correct? A larger diameter will also put the weight further in front of the machine and may cause tipping.</p></blockquote><p></p>