Bill, Like you, when I ordered and built my Series 5 ,15 years ago,I went with the 8.50 treaded tires for the same reasons you specified, however that turned out to be a bad idea. With those tires, landing on pavement was always a bout with mr.toads wild ride. Reason was that those tires weigh a bunch and required a lot of force to spin up on initial touchdown sending you on the forementioned wild ride. Next tire was a treaded 8.00 size tire with a much reduced weight and the problem went away. I fell prey last summer to big tire envy like a bunch of other guys and went with the Desser 8.50 smoothies and absolutely love em. Same weight as the 8.00 treaded that I replaced (for sale by the way) and no surprises on touchdown on pavement. I do 75% grass ,25% hard surfaces and though I only have 50 hours on them , no wear is evident plus they look cool ,and my cruise only went doen a couple MPH. hope this helps Bruce N199CL