I don’t have 9170 (I have 9070) but I have given this a lot of thought if I upgrade at some point. I prefer the two button 9070 shifters. I get the convenience of synchro shifting but I honestly don’t want it. I typically run a 11-23 cassette. If I need to get into the 21 or 23 just for 10-20 seconds, I don’t want it to shift to the small chain ring. I’d rather me make the decision to shift to the small chain ring.

I also live in Florida so there are very few hills. For someone who lives in a mountainous area and has to shift in and out of th big chain ring, I could see them wanting synchro shifting.

It all comes down to personal preference.

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I run the dual-button brake levers with the single-button extension shifters. I wouldn't want to completely give up control over shifting the front chain-rings, and I can't see any benefit to having the single-button brake levers.

Yeah, that was my logic as well. I feel like running the single button 9170 brake levers would negate a big benefit to running di2.

I think I will end up running the 9070 (2 button) brake lever setup.

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Toro Performance

What did you end up going with

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2024: Bevoman, Galveston, Alcatraz, Marble Falls, Santa Cruz

9070 brake lever shifters (left shifter is front der, right shifter is rear der) and 9170 (both rear derailleur) on the extensions. Really liking that setup

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Toro Performance