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Ships within 48 hours · Estimated delivery Aug 27 - Sep 1
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Description
Shimano Ultegra Di2 12-speed ST-R8170 Hydraulic Disc STI and CaliperHigh performance Ultegra wireless hydraulic servo wave disc brake Di2 sti's give you control, modulation and power with minimal effort in all riding conditions. Features: Wireless connectivity to the front and rear derailleurs for effortless trouble free gear shifts 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
High performance Ultegra wireless hydraulic servo wave disc brake Di2 sti's give you control, modulation and power with minimal effort in all riding conditions.Features:
- Wireless connectivity to the front and rear derailleurs for effortless trouble free gear shifts
- 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
- Full and semi synchronized shifting programable, synchro shift compatible meaning a single shifter can control both front and rear shifting which can be fully custom tuned to your riding preferences. Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratio
- Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold
- Drop bar sti with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano sti
- Hydraulic brake lever with servo wave provides excellent stopping power with less effort especially from the hood position
- Hydraulic reservoir tank provides pad to rotor clearance auto-adjust maintaining braking performance during pad wear
- Finely tuneable reach adjusters for the levers enable custom fitment for all hands
- Levers use cr1632 batteries which last for approximately 1.5-2 years
- Kit contains bled st-r8170 sti, br-r8170 flat mount brake callipers with pads, hoses and mineral oil (without rotors or adapters)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 1
A waste
Color: White/Silver-Tone/Digital
If I could I would give it zero stars. It was running when I received it so who knows how long the battery has left. No instructions were included.
The setup is impossible unless you’re into computerized “smart” crap. I looked up how to do that and it’s way too involved for a watch to tell me what the time is. I don’t want a personal dictator, I just wanted a watch I could wear and know what time it is.
Too much hassle to return. It’s going in the trash. Total waste of time energy and money. Zero stars.
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Reviewed in the United States on July 12, 2025
★★★★★ 4
Favorite Watch
Color: Black/Silver-Tone/Digital, Color: Black/Silver-Tone/Digital
I have been using this same kind of watch for 10+ years. I like the belt like strap and the small size. I also appreciate how it has a light on it, the date, and the stop watch. I haven’t had any issues with the battery. These watches have held up well for me although I try to avoid getting them wet. The buttons are hard to press when you first get them but get a little easier to press over time. I still have issues remembering how to change the time and typically have to look up how. The silver parts on the front do wear out over time and turn copper colored. I wore one of these watches for around 5 years before buying a new one when the band which holds the excess space from the band broke. Attached is a picture of the watch that I wore for at least 5 years and a brand new one that I bought.
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Reviewed in the United States on April 11, 2026
★★★★★ 5
Perfect for School
Color: Blue/Silver-Tone/Digital
Purchased as a for a middle schooler who isn’t allowed any electronics at school during school hours. Helps keep her on task without breaking the smart device policies. Perfect “old school” way to work.
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Reviewed in the United States on March 18, 2026
★★★★★ 3
hard to read display, no manual included.
Color: Black/Black/Digital
I haven't decided yet whether or not I will keep the watch. Problem is there is no instruction manual attached and you cannot find one online. However if you call Timex support they will email you the manual if you give them the model number which is included in Amazon's product description. However even with the manual watch is very hard to set. It lacks some functions normally Timex has like time can only be set up there is no down button. And most importantly display is minuscule. So it is really hard to read to set. Watch is a ladies watch. It is small and I like it a lot. But buttons are hard to operate and it is hard to read.
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Reviewed in the United States on April 17, 2025
★★★★★ 5
Great item
Color: Black/Silver-Tone/Digital
Great item
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Reviewed in the United States on March 5, 2026