What You Should Know About Wheelchair High-Pressure Tires

What You Should Know About Wheelchair High-Pressure Tires

What You Should Know About Wheelchair High-Pressure Tires

Wheelchair tires are made in three categories pneumatic tires and tubes, flat-free tires and tubes and solid tires. Additional equipment to be considered when contemplating the purchase of wheelchair tires are hand or push-rims, small or large button quick-release axles and type of front-wheel casters. (Quick-release axles are for interchanging different size wheels on the same axle.)

High-pressure tires are referred to as one of the following: "primos", "clinchers" and "court- tires". Theyare narrower than the everyday pneumatic tire. The tread pattern is minimal, not as deep as an everyday pneumatic tire while requiring a greater inflation pressure.

While the Shrader-type air valve is the most commonly used valve in the United States,a numberof these tires use the Presta valve that originated in Europe. A converter is required so that they can be filled from a conventional pump with a Shrader-type fitting. This type of tire

requires greater inflation pressures (90 - 110+, psi) as opposed to 65 psifor the everyday tire. Many of the manufacturers recommend these tires being used with increased wheel-camber and have designed the tread to be "off-center" to maintain surface contact.

PROS

The high-pressure tire is narrower than an everyday tire that decreases contact area with the floor (smaller footprint). The treads are fewer and shallower which decreases rolling- resistance. This results in the chair becoming easier to push and rolls further per push.

High-pressure tires are commonly lighter than the standard pneumatics.

Many users prefer to trade-off the softer ride of a conventional pneumatic for the improved push-ability of this type of tire.

Favored by athletes for performance reasons.

Have a "protection-belt" made from natural rubber.

Skid-Free.

Can handle a large amount of broken glass.

CONS

The small volume of air at higher pressure does not afford as much shock absorption, thus it makes for a harder ride than a conventional pneumatic tire.

The smaller "footprint" of the tire may also result in diminished traction on wet or slippery surfaces.

Smaller shallower treads tend to wear out quicker than a conventional pneumatic when used for street use.

May require a valve converter for inflation.

Notes

1. CST Super HP This wheelchair tire requires 90 psi.

2. Primo Racer C This wheelchair tirerequires 110 psi.

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