The trials specific ENO freewheel was developed specifically for trials riding. Typically the trials freewheel is installed on the crank arm and a fixed gear is used at the hub. The two main issues with trials is quick engagement and durability of the freewheel. The trials version addresses both of these concerns. We have designed a specific outer gear case that is beefier than our standard freewheel. The case, like all our freewheels, is made out of 8620 steel, cased hardened and then electroless nickel plated. In short, made to last. The engagement system is a six pawl system yielding 72 points of engagement, double that of our standard freewheel. Can this freewheel be used in a typical single speed non trials application? Certainly. Available in 18t only. Made in the USA.