Track Paramounts were the standard for six day racers in the U.S. from the late thirties through the early fifties. Road racing Paramounts never really caught on because Schwinn was slow to adopt derailleurs while european manufacturers were widely using them as early as the thirties. Although Schwinn made "touring" Paramounts with Sturmey-Archer 3-speed internal geared hubs in the late thirties, forties, and fifties, Paramounts with derailleurs in any appreciable numbers first appeared in the early sixties.