Vintage Shimano 105 Double Flight Deck Shifter Brake Set ST-5500 Two Tone | eBay
Vintage Shimano 105 Shifter Left ST-5510 Shift Double FlightDeck 9s STI Lever . | eBay
Whats Shimano Flight Deck all about? There is a ribbon cable inside and what seems to be a button by the thumb of the shifter. What is it for? : r/bikewrench