ExciteBikers are characters from ExciteBike that appear in Sonic For Hire.
One ExciteBiker was on the wheelchair in "ExciteBike". He gave a job for Sonic, because Tails has been in a coma and he was previously injured offscreen. However, the job ended up making Sonic break all of Tails's bones.
Four ExciteBikers appear on an ExciteBike course in "It's On".