This spinning freewheel cog is for use with any single speed or old-school threaded hub. Perfect for your standard single speed, townie or non-fixed fixie. For use with a standard 3/32" chain. Use the Park FR-6 tool for installation/removal. Best single speed freewheel available.
Just about to install another one of these very good freewheels after getting nearly 14,000 miles with the initial one. The price is great and if cleaned and lubed regularly, one should get a lot more miles than what I experienced.