SHIMANO - DI2 Remote Triathlon Shifter - E-TUBE With a refined ergonomic shape and simple, single-button design, the SW-R9160 DI2 remote triathlon shifter provides quick shifting while riding in the aerobars. Utilizing SHIMANO SYNCHRONIZED SHIFT program, each bar end shifter can be programmed to upshift or downshift the rear derailleur while the Di2 computer decides when to shift the front derailleur for the optimal front and rear gear combination. With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear - The removal of traditional mechanical cables in favour of electrical wires eliminates poor shifting caused by contaminates, corrosion and stretching, and also provides effortless gear shifts - Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold - TT / Triathlon single button bar end shift switches are used to operate both front and rear derailleur's with synchronized shifting - Can be used on there own or in conjunction with STI - TT / Triathlon bar end shift switches give the added option of being able to operate the gears from two positions, either these aero extension or the STI lever while under braking which is only possible on a Di2 TT set up - For use with E-tube systems Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.