Easy riding bicycle

摘要

A bicycle design includes a seat tube affixed to the chain stay at a fixed distance rearward of the bottom bracket so that the rider sitting on the saddle can comfortably fully extend one leg to place a foot flat on the ground or to use the proper full leg extension for pedaling. The rider sits comfortably upright on the saddle while pedaling and can pedal while standing up. Increasing the height of the saddle by extending the seat post tube for a taller rider increases the space between the saddle and the handle bars. The fixed distance may be on the order of about the height above ground of a heel of the rider's foot sitting on a properly adjusted conventional frame when the foot is outstretched to reach the ground and/or on the order of about a radius of a circle through which the pedals are moved during pedaling of the bicycle. The fixed distance is preferably in the range of about 4″ to 8″ and most preferably about 6″. The seat tube is preferably affixed to the chain stay frame member at an angle of about 66.5° and the head tube at an angle of about 68°.