I just don't know what your product does for me as a user, at least not yet. As a serious bike geek, there's nothing I couldn't find at one of the better-stocked dealers, some of whom will provide very rich and specific data. I've spend stupid amounts of money on bikes, but they've all been carbon-framed, drop-handlebarred, with 20 gears, rendering your advanced search not nearly advanced enough.

Your tool could be incredibly powerful and useful for me if your database held information on weight, allowing me to shop on a dollars-per-gram basis. Comparison shopping features would be very useful and provide you with a substantial revenue stream in the form of affiliate fees. A database of parts and a wish list would allow me to configure a home-built bike or an upgrade.

If I were a casual cyclist, I can't see your site making me any less confused than the front page of the first cycle dealer I pick out of Google. If I found my perfect bike I'd still need to Google for a dealer that stocked it and potentially get tripped up by different model years, different specs etc. I don't really know what any of these terms mean, how many gears I would want or which material I want my bike made out of - I just know that I want a nice light bike for buzzing around town, or something plush and comfortable for pedalling round the park, or something that will carry my shopping. I see the mouseover popups that explain some of the terms, but they don't clarify things all that much and it seems like I'm stumbling around at random.

As it stands, I just don't know why I'd use your tool instead of going straight to a bike retailer. Your stem calculator is useful because it provides information I can't really find anywhere else. The rest of the site feels like you've built it because you can. I can't see the problem that you're trying to solve.