In fact, this varied terrain is one of the factors contributing to wheelchair discomfort and inefficiency. A wheel designed for the smooth floor inside a house or a public building is completely inappropriate for traveling on a rocky field or bumpy road.
Suspension blocks are the quickest way to provide both, in addition to suspension and turning capabilities, but don't necessarily meet all demands. A rotor can also be used, but has a much lower maximum speed (60rpm, regardless of wheel size) for propulsion purposes - however it can also have its braking torque set to 0 to make it a free-wheeling axle.

Today, the Ford Taurus SEL — the top-of-the-line before you get into the high-performance SHO — comes standard with 18 inch wheels. Many buyers select the optional 19-inch wheels, though, which come with Goodyear Eagle RSA 255/45R19 tires. The alpha-numeric soup on the sidewall might not instantly make sense, but compared to what was previously available on the Taurus, that wheel and tire combination is massive.
It’s a good idea to schedule regular inspections of your steering and suspension systems. It is usually easier, cheaper and safer to discover and fix a problem before it snowballs, causing further consequences.