ultimate wheel

noun

ultimate wheel

noun

1

Cycling, Hobbies, Lifestyle, Sports A type of unicycle without a frame or seat, consisting of only two pedals attached to a wheel.

It is also interesting to note the number of different types and designs of cycles, including the so-called “ultimate wheel”—a wheel with pedal arms and pedals but no frame or saddle or handlebars.1973, Jack Wiley, The Unicycle Book:
There are three possibilities to prevent the ultimate wheel from tilting to one side, which is the greatest difficulty in riding the ultimate.2006, Anders-Wilkens, Andreas, Unicycling : First Steps, First Tricks:

1 more example

Why ride an ultimate wheel? Well its obscure, its fun, and only a little more difficult than riding a unicycle.2021, David Bagley, “Making and Riding the Ultimate Wheel”, in SillyCycle.com:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.