Looking for bicycle graphics. Free non-copywite.?

Be careful about snatching pics from the Internet for a retail site. If you take someones property, even if doesn't say copyright, it is still their property and it can be a mess. Some states like California have artist protection laws that protect their works, copyrighted or not. My first suggestion is go to Getty images and buy them. They're not that expensive and you avoid issue. But if you'd rather spend time than money, do a flickr search for images you like and ask the owner of the photos if they will give you permission to use them in exchange for a byline (listing the photographers name below the picture). If they say yes, keep the email as proof

Simply search "bike giff" and you may find tons of copyright free available art that you can use.