I’m trying to develop a homebased business. I’d like to do something with dealing with bicycles, and I need to know the what demand for certain accessories. I don’t want to develop something and no one buy it, lol. Here are a few ideas. What do you guys think?

Make and sell recumbent specific bags and panniers, clothing and raingear.
Make and sell custom bicycle flags, ankle bands, gloves for high viability and safety.
Design a reverse hydropack. A hydro pack that fit on your front side.
Sell an ebook on how to make your own touring gear.
Design bike clothing for big guys like me.

Thanks