The shimano r783 2 3 x 10 speed rapidfire shift levers are precise mountain bike style levers for road bikes fitted with flat handlebars and 10 speed drivetrains the instant release allows for super fast shifts delivering the chain to the next gear the moment the lever is actuated with no hesitation and the multi release allows multiple gear changes from both levers with one sweep further adding to the speed of shift 2 way release allows the upper shift lever to performs the same multi shi