No proprietary bits. Eyelets for fenders and racks. Generator hub and lights. Full coverage fenders. Rear rack with tabs for pannier hooks. Braze on for 3 bottles. Clearance for tires up to 38mm. 700 wheels. Pro fit with every bike. Strong wheels.
Design for fenders & rack so they look integrated.
My wife says if you want to sell to women, have women choose color options.