• Smaller wheels are more practical for manoeuvring around small
spaces but are not as good as larger wheels on uneven ground.
• Depending on the particular model of chair, the wheels can
all be the same size or smaller at the front. Some models have large
front drive wheels which are good for negotiating kerbs and outdoor
terrain.
• Rear wheel drive has better grip than front wheel drive, but
it is not as easy to manoeuvre as the latter. Another design is a six
wheel-base with the drive wheels in the middle which allows for a smaller
turning circle.
• All powered chairs can have their motors overridden so as to
be pushed but they are very heavy.
• Pneumatic tyres are smoother and more comfortable
for the user but need to be checked to maintain pressure and for punctures.
Repairing punctures is done the same way as bicycle tyres. However,
if this is a problem then a local cycle shop or specialist retailer
can carry out the repair. You can have deeper treads to increase stability
and grip on rough surfaces.
• Solid tyres do not need inflating and don't
puncture. They are also good for manoeuvring on certain surfaces.
• Puncture-proof tyres are made of a special
rubber compound which provides a compromise between pneumatic and solid
tyres - they absorb shocks but don't puncture.