The Shimano Dura-Ace ST-7801-L is the left-side dual control lever from the 7800-series 10-speed groupset, designed for road cyclists running double chainring (2x) drivetrains on drop bar bikes. It combines front derailleur shifting with rim brake actuation, using a mechanical cable-pull system suited for Shimano 10-speed road derailleurs like RD-7800 or RD-6600, and most 9-speed road derailleurs due to matching pull ratios. The left lever shifts between two chainrings with tactile indexing: one click for trim to reduce chain noise on the big ring, and a full stroke to the small ring. Road riders choose this for builds matching vintage Dura-Ace 7800 components, where its crisp shift feel and ergonomic hood shape support long rides without hand fatigue. It pairs with Super SLR road caliper brakes and requires standard road cable housing.