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These are the large wheels on the back of the wheelchair, exclusive of tires, push rims, and inner tubes. Their appearance is similar to that of bicycle wheels. They include a growing number of spoked performance wheels that are now available for sports and eveyday use.
Performance wheels are used for sports or when increased pushing ease and chair performance are required. The quality of the wheel hub and bearing will affect push-ability and rolling distance. These wheels may have varying numbers of spokes in varying thickness (7 to 10ga), made of varying materials (steel is preferred by purists), and may be laced in a number of ways (interlaced, radial, or crossed). The number and size of the spokes can affect durability, shock absorption, weight, and performance. The more spokes, the more stability the wheel will have. If less spokes are used on the wheel the spokes will have to have greater tension and heavier or stronger rims.
Any engineers or wheelchair enthusiasts out there want to comment on this subject?.Have it explained by some cool bikers and roadies at www.garynuke.homestead.com/wheel.html.
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