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These affordable (non aviation) ATV tires are smooth and treadless (21x12-8) measuring about 21-inches tall. Mounted on an 8-inch Matco wheel, these larger tires raise the height of the airplane by close to 2-inches. We did not change the standard nosewheel (continuing to use an 18-inch tire).
The standard tires (shown above) supplied in the kit measure about 18-inches tall, and are mounted on 6-inch Matco wheels).
We like the look of these new tires on the STOL CH 750!
These larger tubeless 21-inch ATV tires make landings and taxiing smoother on grass or dirt fields (with 5 - 10 PSI), and other non-prepared landing strips such as beaches. (Note that these tread-less tires are not made for paved runways). We've only noticed a slight decrease in cruise performance (2 to 5 mph).