The SW-R671 TT Shifters are customizable just like all the other Di2 shifters, and allows you to create customized shift maps and fine tune performance to even the most specific of needs. Take your time-trial / triathlon bike to the next level with a Shimano Di2 Ultegra system.SEIS - Shimano Electronic Intelligent System. Compatible with Ultegra 11-speed Di2 & Dura-Ace 11-speed Di2 groups. Fit extensions with 22.2mm - 24mm outer diameter & 19-22.5mm inner diameter. SW-R671 shifting switches for aero bars - left/front & right/rear. Please verify your address during checkout. We are not responsible for any wrong or undeliverable addresses. Buyers should return items within 30 days after receiving the order. The item "Shimano Di2 SW-R671P Remote TT Bar-end Shifter Pair L/R New" is in sale since Wednesday, September 9, 2020. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Shifters". The seller is "id4beauty" and is located in Hillsboro, Oregon. This item can be shipped worldwide.