RAM mount is what I use on my Yamaha FJR1300. It's great because you can buy an extra base for your car and easily move the N900 from one vehicle to the other with no hassle. If your handlebars are 7/8" then the motorcycle mount should work well on your bicycle but they may sell a bicycle specific mount.
http://www.ram-mount.com/Products/Mo...8/Default.aspx