You most definitely can. Application is key though. If you're Jonny from Jonny Cycles and can rip a skid over 200 feet then I wouldn't recommend it. But for every day use, with occasional skip stops and skids, it's ok. I have built many many conversions over the years spinning on a fixed cog without concern. Mind, I clean/degrease/alcohol/acetone the threads of both* very well, use Red Loc-Tite and either Rotafix or use a very long handle(d) chainwhip.** If folks tell you it can't be done safely they are dead wrong. I have had grocery bikes, commuters, fixed MTN bikes, fixed trainers, etc. all with spun on fixed cogs and never had a problem. The first one that ever broke loose was one that my 200 pound skidding brother cracked free after over 2 years of hard use. BTW, when we race up at the track, you can take a gander and see how many of the P/1/2's have lockrings on our rear wheels. You'd be surprised at the lack of them. In over 12 years of racing, I've never seen a problem. Money is hard to come by these days. Forget the new fixed rear wheel/hub. Save some green and buy your Mom/Dad/Dog/Cat/Iguana/Girlfriend/Boyfriend/Spiritual Advisor/Grandma*** a nice Holiday gift.




*hub and cog
**with proper pipe strength of course
***grandpa's have a tendency to hoard, so pass that one up