I have been comparing the ride on my 19" Athmos with its stock flat-tread knobby tire, and my 24" Nimbus with a Maxxum Hookworm. The Athmos tire (no brand, says Bike Trial 20x2.50 and “FIT RIM HB 396x30” and www.beatles.com.cn) is absolutely awful when riding to the side of the crown of the road. I have to counterbalance to the uphill side like crazy to keep from ending up in the ditch.
The same road on the Nimbus with the Hookworm is a dream. I hardly notice I am riding on an inclined plane. The easy solution is to get a tire with a circular cross section to replace the “beatles” clunker. But here I run into a quandary. The Athmos page claims that the tire is a “Bike Trial 19” x 2.5". This is a specific tire for this rim. A regular 20" tire cannot fit this rim." But it still identifies the tire as a “Nimbus Cyko-Lite 20” X 2.5" " And on the Unicycle.com site I see no other options. So can I get the 20" Hookworm? Will it fit on that rim? And if not that, then what? I would hate to have to rebuild the wheel with another rim and another set of spokes.