After you have working software and have a number of example bikes and some compatible components to mix and match on them, then ask people to lend you their stuff. To get started and have bikes that are in original or nearly original condition, you and your colleagues should be foraging at garage sales, thrift stores, flea markets and on Craigslist (that's how we get them) until you have enough to set up enough working data for your software. After you are happy with the software then ask for help to expand your database.

I still don't know if your ultimate goal is to sell bike stuff or not. For now take the prices off of that web page. It confuses potential material lenders of what your purpose is for the software. If you want to sell stuff (or the software) in the future then add it in later.