A wheelchair 3, wherein said primary spring and said secondary spring are adapted to compress upon {TAIL ~ upward movement} of said front caster wheel, and wherein {HEAD ~ said secondary spring} has a higher compression range than said primary spring 
A wheelchair 3 , wherein said primary spring and said secondary spring are adapted to compress upon { TAIL ~ upward movement } of said front caster wheel , and wherein { HEAD ~ said secondary spring } has a higher compression range than said primary spring
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH