pacific-cycles.com/galleryP. … 2=4&pbid=7 pacific-cycles.com/news2.asp?catid=1&nid=14
A wrong US patent number printed on the frame? pacific-cycles.com/galleryP2 … d=7&pid=65
US Patent of the IF technology: freepatentsonline.com/7264257.html
Here is a reply from Ryan Carroll, the Chief Development Engineer of Pacific Cycles.