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Average connection time 25 secs
The Shimano ST-6870 features Di2 technology shifting for easy and precise control - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear. Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift.
The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts.
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Where reviews refer to foods or cosmetic products, results may vary from person to person. Customer reviews are independent and do not represent the views of The Hut Group.
Performed a replacement of my DI2 10 speed to Ultegra DI2 11 speed using RD-6870, CS-6800, and CN-9000. The review was straight forward and performs well. Like the narrower ratios I'm getting in the taller gears now. Shimano seems to want you to also upgrade teh front DR, but that's not essential. I may do that if Pro Bike Kit starts selling the Ultegra DI2 front DR.
Good that I can find GS cage for DI2 setup as I wanna install 11-32T cassettes in my new bike which will be mainly used for climbing. I admit I am not a good climber and I am addicted to electronic shifting. That's no way to back to mechanical shifting. The Ultegra Di2 setup will be a good solution and I think it will be as good as Dura Ace (except the weight and the noise it would producing while shifting). Hopefully this can be an option when selecting the groupset so that I don't need to buy the component separately.
Reliable Ultegra DI2 rear derailer for a great price. Does as good of job as the more expensive Dura Ace.
You can always count on Shimano products to be top notch and with the prices you can't beat Probikekit. Easy install to my existing Di2 system and with the usual minimal adjustment required of Di2 the rear derailleur works great. Highly recommend moving to the 11 speed if you can as you can especially use that 32 cog if you live in a hilly area. I didn't think I needed it but it certainly is a nice step up. Go cycle your legs off!!!