I just purchased a new inexpensive RB made of 520 steel. The ride was smoother than the AL bikes I test rode, including a LeMond, Specialized and Bianchi which were steel. This new bike rides as good as the old Peugeots and Motobecanes I rode in the late 1970s. What is the history of 520 steel and how is it viewed by builders? Do the French and Italian builders use 520?