Electric bicycle

A chain stay for a bicycle, comprising:

• a first side wall having a front end and a rear end;
• a second side wall having a front end and a rear end, the second side wall being laterally spaced from the first side wall, the front end of the first side wall being forward of the front end of the second side wall;
• a third wall extending between the first and second side walls, the third wall defining an aperture therethrough permitting the passage of a flexible drive member of the bicycle therethrough;
• and
• a top wall connected to a top of the first side wall, a top of the second side wall and a top of the third wall,
• at least a portion of the third wall extending downward from the top wall and from one of the first and second walls toward another one of the first and second walls,
• a width of the aperture being less than a distance between the first and second walls.