Ok, I mentioned in a thread last week about my dealer showing me a caster wheel replacement for Scag mowers, and I went out there to trade mowers today, and asked him about them, and here is what little I know. It is called the Impact Contol Wheel. The literature says it "utilizes five springs radially to smooth out the bumps and offers an extremely comfortable ride. The springs compress to absorb the energy of the wheel hitting a bump, and then expands to release that energy as the wheel returns to level ground." It says it is available as a caster tire assembly 13X6.5, and fits the Tiger Cat, Wildcat, and Turf Tiger models. I don't know why it wouldn't fit the Cheetah, as I think they have the same size caster wheels, but it doesn't list it. Anyway, they are distributed by Midwest Equipment and Supply Co, Inc, a wholesale distributor for Scag and other power equipment in several states. They do have a website, but little info unless you are a dealer, but they have an email contact available, so I suppose if someone wants to contact them, they can try that. The literature doesn't say who the actual manufacturer is. Hope this helps someone.