I think that you may find it challenging to make money from this, although there is quite probably a market. One of the questions would have to be how are you going to build a customerbase? What it is that will get the potential cyclist who just changed channels at 2 in the morning, saw the tour de frankfurt and realised they were fat so wants to get a bike, to come to you.
I think you'll need to have a fairly clear idea as to how you are going to actually make money from it and build up a small business plan stating this, showing the costs, etc.
After then you'll be sweet. Put in the hard yards, make the most of our wonderful tax system that benefits those who lose money and I am sure you'll be able to do it. Just be prepared that most new businesses don't make money for the first couple of years.
Go for it!