Thanks for the comments. The bikes we have sourced are reasonable quality and we think people will take care of them. The main reason for abandonment is flat tires, and we hope to have a good mobile mechanical set up as part of the venture.
We are confident that sponsors will appreciate the opportunity to be seen in this way in London. In the market research we have done, many more people look at bikes (and remember what was written there) than they do at taxi and bus ads, and those are much more expensive.
There is hardly a problem in the world for which bicycles are not part of the solution.
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by Mark Mullen