For the header, enlarge the logo and minimize the blogger, etc icons to the right of it. The logo should be the one that stands out more..
Could the images of each bike point to their respective product description? On the product page, I'm having to scroll right to see all the products and not all the bikes are shot on a white background. The product images should have a consistent background, IMHO. For the main page, I think a white background and current content is fine - I would just consider making the whole thing bigger to kill some of the white space on the sides. You could enlarge the logo and the bike images down to the fold since that is the true focus.
I like its simplicity... You could put a product title below or above it for faster reference. The company profile could be relocated to another page... The first thing you want to do here is to advertise your products. You could even put the price and model number...
Yeah, I gotta agree with abixalmon, you must change the icons. If you were linking to google talk or Blogger, they might be okay with it. But just lifting their design for your own use is probably a no-no. Additionally, with such a nice design, I think those icons look horrible there. Of course, I'm a typical "mac-user, gimme gradients, translucence, rounded corners, and reflections" type guy, but I still think you could do much better than those icons. Other than that, not too bad.
Very clean design. It looks like you put a lot of time into this. Make sure your images are trademark free if you haven't already.
Product description will gives more information for the visitor and increasing SEO as well. I don't know with your screen resolution, but for my screen (1024x768) the text I think to small and hard to read.