Originally Posted by
mrkano
Sorry yeah it's an old 70s wheel I think, so not intended for a lock ring with the lock thread...
Any option around this??
Use your search engine of choice to look up rotofix and Loctite. Rotofix is a method to tighten a fixed cog as much as possible onto a freewheel hub that will not accept a lock ring. Loctite is a thread locking adhesive that will bond the threads of the cog and the hub. It's not an ideal solution, but it has worked for many people who did it carefully. Ideally you would get a wheel with a fixed gear hub or rebuild your current wheel with such a hub.