34/52 front chainrings?
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  1. #1
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    34/52 front chainrings?

    I have a 2017 Giant TCR with DuraAce Di2. Have a 36/52 in front with an 11/30 in back. I would like to switch the 36 in front for a 34. I have heard that combo will work with the Di2. Has anyone tried it or something else with an 18 tooth spread instead of the 16 tooth spread? How has it worked? What adjustments need to be done?

    Thanks.

  2. #2
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    Just check Shimano's Specs on the derailleur range. If they say it's within that range try it. Not a big investment, and you can get most of your money back selling the ring if it doesn't work. How about just go to a 34/50 with a 11-32 in back.

  3. #3
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    I run compact and an 11/36 with an 8050 GS and it works fine, 2 teeth over the spec. Gear control keeps the slack chain from being an issue by preventing small / small combo. I've also run 11/34 with a compact on 6870 GS rear which is 2 teeth over the spec without a problem. Just need to make sure the chain length is cut to work well.
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  4. #4
    'brifter' is a lame word.
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    Quote Originally Posted by Srode View Post
    I run compact and an 11/36 with an 8050 GS and it works fine, 2 teeth over the spec. Gear control keeps the slack chain from being an issue by preventing small / small combo. I've also run 11/34 with a compact on 6870 GS rear which is 2 teeth over the spec without a problem. Just need to make sure the chain length is cut to work well.
    He's talking about the front derailleur...
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  5. #5
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    Right, I was talking about the small front chainring. My rear cassette is an 11/30 which is the largest Shimano says I can have for the D/A derailleur, although I have heard that I could put an 11/32 on it with not problem. I like the 52 tooth big ring and I want an 11 tooth in the rear as well. Just want easier gears going up super steep hills.

  6. #6
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    No experience myself but I've definitely read of people doing it no problem and don't recall anyone reporting problems when I was looking into the same thing.

  7. #7
    Matnlely Dregaend
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    From experience a large difference in front chain rings makes for very odd up and down shifts. You're going to have to shift the rear pretty drastically if you want to keep a doable cadence.
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  8. #8
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    Quote Originally Posted by DrSmile View Post
    From experience a large difference in front chain rings makes for very odd up and down shifts. You're going to have to shift the rear pretty drastically if you want to keep a doable cadence.
    Nice thing about Di2 is programming the rear to shift up or down automatically when shifting in the front.

  9. #9
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    Quote Originally Posted by DrSmile View Post
    From experience a large difference in front chain rings makes for very odd up and down shifts. You're going to have to shift the rear pretty drastically if you want to keep a doable cadence.
    Key point. Whether it "will work" is not what the OP should be focusing on, but rather whether it works well as a gear pattern. That big front drop implies a riding style that some (like me) would find uncomfortable. I find that the 16 tooth drop of a 34/50 is about on the limit, but YMMV.

  10. #10
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    Quote Originally Posted by Kerry Irons View Post
    Key point. Whether it "will work" is not what the OP should be focusing on, but rather whether it works well as a gear pattern. That big front drop implies a riding style that some (like me) would find uncomfortable. I find that the 16 tooth drop of a 34/50 is about on the limit, but YMMV.
    What do you mean, "a riding style some would find uncomfortable?"

  11. #11
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    Quote Originally Posted by JDCowboy View Post
    What do you mean, "a riding style some would find uncomfortable?"
    Probably a situation where when you change front rings, you have to shift the back 4 or 5 cogs instead of 3.
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  12. #12
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    Remember I have Di2. I have it programmed to automatically shift the rear cassette down (smaller cog) one gear when I go from the big to small chain ring and up two gears (bigger cog) when I go from the small to the big chain ring. No sweat to change that programming.

  13. #13
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    Quote Originally Posted by JDCowboy View Post
    What do you mean, "a riding style some would find uncomfortable?"
    You're climbing a hill with significant pressure on the cranks. You're going down to lower gears and finally need to shift the front. The wider the gap in the front rings, the more your cadence will jump when you shift a bigger difference in the front. Having your shifting system automatically determine how many cogs to shift in the back does not seem reasonable in that situation. And that is where most of my "challenging" front shifts happen. If it's just starting out from a stop and you shift to the big chain ring, not much of an issue.

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