Ultimate wheel
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ULTIMATE WHEEL is a wheel with two pedals directly connected - similar to a unicycle and impossible wheel. It has no seat or frame but offset and functional pedals. There are several different designs: the most popular involves a circular disk of wood fitting inside a regular small bicycle rim. Pedals are attached directly to the wooden disk. This design is strong and easy to build but is relatively heavy. A more uncommon style is to fashion aluminium spokes.