Crupi OS20 Pro XL Race Frame

PRODUCT DETAILS The OS20 Pro XL Race Frame is an All-American Made frame with a 21.5" top tube and designed for riders 5'-4"+.  The OS20 set up is great for those who love the stability that the sightly bigger 451mm rim/tire size gives you.  OS simply stands for "Over-Sized" twenty inch wheel that some racers prefer for the stability and the extra rolling diameter of the bigger wheel.  The frame geometry was based on the Answer Dagger OS20 fork but most standard Pro 20" forks will work with the OS20 wheel so you don't need to buy a OS20-specific fork.  Crupi OS20 Race Frames feature a Pro Taper head tube and use a traditional threaded Euro BB Shell. Built with seamless drawn 6061 T6 Butted tubing Tubing is squared off at the ends to provide more welding surface Larger diameter square shaped down tubes stiffen and strengthen Chain stay tubes are tear drop shaped for a very strong and stiff back end 3/8" (or 10mm) axle slots are parallel to the ground meaning no matter what position yo