Similarly towards the wheelbase, downtube length is the outcome from the designer’s decisions same as around the length of The pinnacle tube, seat tube, and leading tube. Earlier racing bicycles mounted their shift levers on the down tube. On Newer products, They are really mounted on handlebars with brake levers. https://bike-engine-flush48256.gynoblog.com/34189149/the-5-second-trick-for-bike-part