▁driven ▁and ▁the ▁faster ▁wheel ▁coast s . ▁ ▁R ear ▁drive ▁often ▁uses ▁" id ler " ▁pul le ys ▁to ▁route ▁the ▁chain ; ▁front - w heel ▁drive ▁can ▁eliminate ▁id lers , ▁so ▁offers ▁less ▁fr iction ▁and ▁also ▁less ▁weight . ▁ ▁It ▁can ▁also ▁increase ▁lug g age ▁capacity . ▁ ▁However , ▁front ▁drive ▁with ▁two ▁front ▁whe els ▁uses ▁some ▁non - standard ▁components , ▁and ▁as ▁of ▁ 2 0 1 7 ▁is ▁used ▁only ▁rarely . ▁ ▁As ▁with ▁other ▁cycles , ▁a ▁vel om obile ▁may ▁use ▁susp ension . ▁ ▁Sus p ension ▁tends ▁to ▁improve ▁r ider ▁comfort , ▁and ▁can ▁also ▁improve ▁speed — it ▁takes ▁energy ▁to ▁" b ounce " ▁the ▁vel om obile ▁and ▁r ider , ▁so ▁a ▁susp ension ▁can ▁reduce ▁the ▁energy ▁lost ▁to ▁b oun cing . ▁ ▁However , ▁susp ension ▁adds ▁cost , ▁weight , ▁and ▁maintenance . ▁ ▁Common ▁vel om obile ▁designs ▁include ▁no ▁susp ension , ▁front - only ▁susp ension , ▁and ▁front + re ar ▁susp ension . ▁ ▁As ▁of ▁ 2 0 1 7 , ▁there ▁are ▁several ▁commercial ▁mak ers ▁of ▁vel om ob iles . ▁ ▁At ▁the ▁same ▁time , ▁there ▁are ▁still ▁many ▁" one - off " ▁mak ers . ▁ ▁Ind ividual ▁designs ▁( both ▁one - off ▁and ▁production ) ▁emphas ize ▁specific ▁features . ▁ ▁For ▁example , ▁some ▁emphas ize ▁aer od ynam ics