The present invention provides a curb-climbing wheelchair having pivotal
arm assemblies. The pivotal arm assemblies include at least one front
caster and have the ability to rotate or pivot. The pivot arms rotate or
pivot in response to moments generated by accelerating or decelerating
the wheelchair thereby raising or lowering the front caster(s) through
the rotational movement of the pivot arms. By raising or lowering the
front caster(s) in such a manner, curb-like obstacles can be traversed in
a low-impact manner.