DURA-ACE 7400_SIS Shimano's Centennial Teaser Site

Regardless of the release of the EX and AX Series that followed the first generation of DURA-ACE in 1973, the feedback in the European race scene was not very great. It was the 7400 Series then, which was a product for the comeback of the DURA-ACE in terms of function, quality, and design. Installing the “index system” which was previously only on children bike components onto racing components as the “Shimano Index System (SIS)”, Shimano aimed to decrease miss-shifting and speeding down during the races with solid and accurate operation. Furthermore, making it possible to switch to the original friction operation made it easier for Pro-racers to try the new operation with ease and received praise.
Shimano's Centennial Teaser Site
www.shimano.co...