Because you have a stable of competent employees ready to go, that given more torque and speed , wouldn't tear up the turf and spin tires? What I'm saying is toro probably knows the limits of the stander design and these are the limits. an 11-13 mph stand on in tight areas is going to make soup out of your turf. so much so only the best operators will be able to keep it from doing that and in doing so? Probably only manage to average….drum roll…8 mph, and after all that, with more stress and time spent maneuvering and angling to avoid tearing and spinning. That ZK isn't going to do what that GS will in the same terrain and circumstances. Toro makes their machines with a fleet of mediocre workers in mind, not elite ballet dancers. They aren't dumb or backward, their engineers are at the top of their game. If they thought they could get more production from the platform they would. IT could totally be in the works right now…but they are waiting for the bean counters to tell them when it ok to release a product redesign. Wright, on the other hand, deals with this by having several purpose built models out there, rather than just one. Scag? Scag is good with Turf Tigers and SWZ…which essentially haven't changed in decades. But they aren't known for well thought through designs and engineering that lasts the test of time, over and above the basic machine (Im looking at you ProV and cougar!) Scag makes a basic product that wears like a rock. But their vRide, although a good machine, isn't well thought out as a whole package. Not in the way the Grandstand is. Toro took a long time, a very long time, to release the grandstand. They interviewed lots of guys and sat on the fence like a vulture season after season watching the Wright and the Great Dane develop… then watched great dane get bought by JD… and still they watched. I know, for all the people who like to make fun of my 'back in the day stories' I was there when it happened, I got interviewed too. I was in the top ten of the competition to name it too (would have won a free one) a Lot of time went into that 'slow' mower. and for what it's worth, there are riders that go 8 mph too. you're right It is all about time. but ground speed does not always = time. Walker can prove that to you. A stand on isn't intended to compete for time on open fields.