How do I install my FlexFrame-U Bracket? Kryptonite Support October 27, 2016 18:21 Updated 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? U-Lock with ATPO Manual Can all New York U-Locks be mounted on a bike frame? What are the parts of a U-Lock? Ring Locks Comments 0 comments Article is closed for comments.