obile ▁mak ers ▁have ▁year ly ▁production ▁on ▁the ▁order ▁of ▁tens ▁or ▁maybe ▁a ▁few ▁hundred ▁vel om ob iles . ▁ ▁T aken ▁together , ▁these ▁factors ▁mean ▁vel om ob iles ▁are ▁often ▁much ▁more ▁expensive ▁than ▁other ▁cycle ▁types . ▁ ▁As ▁an ▁example ▁of ▁prices ▁and ▁price / weight ▁trade offs , ▁as ▁of ▁April ▁ 2 0 1 7 ▁the ▁mak er ▁Tr is led ▁offers ▁their ▁" Rot ov elo " ▁model ▁either ▁with ▁a ▁rot ational ▁m old ed ▁pl astic ▁fair ing ▁or ▁with ▁a ▁carbon ▁fi ber ▁fair ing ▁( as ▁well ▁as ▁some ▁other ▁weight - s aving ▁changes ). ▁ ▁The ▁body ▁shapes ▁and ▁underlying ▁framework ▁are ▁similar ; ▁the ▁rot ational - m old ed ▁version ▁we igh s ▁ 3 3 ▁kil og rams ▁and ▁has ▁a ▁list ▁price ▁of ▁Au $ 6 5 0 0 , ▁while ▁the ▁carbon ▁fi ber ▁version ▁we igh s ▁ 2 0 ▁kil og rams ▁and ▁has ▁a ▁list ▁price ▁of ▁Au $ 1 0 9 0 0 . ▁ ▁Much ▁of ▁the ▁cycle - related ▁infrastr ucture ▁design ▁is ▁based ▁on ▁the ▁typical ▁configuration ▁of ▁an ▁u pr ight ▁b icy cle . ▁ ▁For ▁example , ▁multi - modal ▁transport ation ▁such ▁as ▁bi ke / train / bi ke ▁routes ▁often ▁use ▁b icy cle ▁ra cks ▁in ▁the ▁train , ▁and ▁the ▁dimensions ▁of ▁ra cks ▁and ▁also ▁the ▁train ▁ing ress / eg ress ▁assume ▁a ▁conventional