RideShimano on Twitter: "TBT: 1984 Shimano introduces the Dura-Ace 7400 series. The first SIS shifting system in cycling history #RideShimano https://t.co/GIfp3Gm2Fe" / Twitter
Alan Carbonio / Full Shimano Dura Ace 7400 Group / 51 cm – velowizard.com