▁for ▁disabled ▁athlet es ▁to ▁particip ate ▁in ▁cy cling . ▁These ▁include ▁leg ▁and ▁arm ▁prost h esis ▁to ▁allow ▁for ▁athlet es ▁to ▁use ▁the ▁same ▁types ▁of ▁b ikes ▁that ▁able ▁bod ied ▁athlet es ▁use . ▁Pro st h esis ▁used ▁for ▁cy cling ▁are ▁often ▁very ▁expensive ▁and ▁are ▁manufact ured ▁from ▁materials ▁such ▁as ▁Car bon ▁fi ber . ▁New ▁materials ▁and ▁methods ▁such ▁as ▁ 3 D ▁printing ▁are ▁being ▁investig ated ▁in ▁the ▁aim ▁to ▁reduce ▁the ▁cost ▁of ▁prost h esis ▁and ▁to ▁improve ▁comfort ▁for ▁athlet es . ▁ ▁Hand ▁cy cling ▁ ▁Hand ▁cycles ▁initially ▁developed ▁due ▁to ▁a ▁desire ▁by ▁people ▁with ▁imp air ments ▁to ▁particip ate ▁in ▁sports ▁alongside ▁non - disabled ▁athlet es . ▁The ▁Par al ym pic ▁Games ▁allow ▁the ▁use ▁of ▁two ▁types ▁of ▁hand ▁cycles , ▁these ▁are ▁rec umb ent ▁and ▁kne eling ▁hand ▁cycles . ▁Racing ▁hand ▁cycles ▁often ▁have ▁many ▁g ears , ▁which ▁can ▁range ▁from ▁ 1 ▁to ▁ 3 3 . ▁The ▁construction ▁of ▁hand ▁cycles ▁often ▁consists ▁of ▁materials ▁such ▁as ▁al umin ium , ▁tit an ium ▁and ▁carbon ▁fib re . ▁ ▁W heel ch air ▁basketball ▁ ▁W heel ch air ▁basketball ▁is ▁an ▁adaptation ▁of ▁the ▁able - b od ied ▁version . ▁Since ▁the ▁beginning ▁of ▁wheel ch air ▁basketball ▁in ▁ 1 9 4 6 ▁there ▁have ▁been ▁significant ▁changes ▁in ▁wheel ch air ▁technology . ▁Modern ▁wheel ch airs ▁used