Similarly to your wheelbase, downtube size is the outcome of your designer’s selections similar as about the length of The pinnacle tube, seat tube, and top tube. Earlier racing bicycles mounted their shift levers over the down tube. On more recent models, they are mounted on handlebars with brake levers. https://bike-engine-details82591.thechapblog.com/34109193/the-party-bike-klein-roosboom-diaries