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? Can all New York U-Locks be mounted on a bike frame? What are the parts of a U-Lock? Locking your Bicycle with Messenger Mini + Kryptonite Lock Maintenance Comments 0 comments Article is closed for comments.