When you talk to a Commercial mower dealer, you always hear the expressions .. heavier .. stronger .. wider .. longer .. faster. I thought I would look at the weight, and size issue a little. I figure if the machine is supposed to be made out of heavier, and stronger material than it's competitors. that it must also be a lot heavier to reflect the use of stronger heavier gage materials. I've come to the conclusion that there is very little weight difference when comparing similar deck sizes and engine configurations. So I can only conclude from this that there is also very little difference in the quality of materials used to build these machines. I guess the Manufacturers design would play the biggest part in the strength of how all this steel is put together. Most of the veterans on here probably already know all this, but I am a green horn when it comes to commercial ZTR mowers, so I' found this to be quite interesting. Here are a few of the major brands, and a few specs on each: Brand-Model-Motor-W X L -Weight Gas Models with 27 hp Kohler Toro Z500 27 K 76x81 1215 B Hog m2761 " 72x85 1225 Hustler Su - Z " 62x75 1190 Exmark La - Z " 72x78 1138 Scag Turf-T " 72x87 1298 Ferris 3000zx " 65x81 1246 Yazoo 61271 " 62x82 1090 Diesel Models Scag Sabre-T 31HP 72x92 1635 Kubota ZD-28 28HP 72x89 1660 Exmark LZ-XP 27HP 72 x82 1657 I also found that I was ignorant when it came to steel thickness, and the gage numbers that are used. It turns out that the lower the gage number the thicker the steel is. I thought that it was opposite of this, but I was wrong. Example: 7 gage = 4.76 mm thick 10 gage = 3.404 mm thick I guess your never to old to quit learning.