How do I install my FlexFrame-U Bracket? Kryptonite Support August 26, 2017 20:18 Updated Follow See our instructional YouTube video to help with bracket installation for your FlexFrame U-Bracket. Also attached is a PDF with written instructions for further assistance. FlexFrame-U mounting instructions- English (2).pdf 1 MB Download Related articles Where on my bicycle should I mount the FlexFrame-U Bracket? Do the New U Locks look the same? Can all New York U-Locks be mounted on a bike frame? The New U offers increased security and a fresh new design. I have an older model lock is it still covered under the warranty? Comments 0 comments Article is closed for comments.