what is best for my 11-34T cogs
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  1. #1
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    what is best for my 11-34T cogs

    Hello everyone

    So I'm building my new shimano groupset 105 r7000 for my Giant SCR. I purchased all except crankset. I chose 11-34T with long caged RD cause here on my place, there's a lot mountains and hills.

    So my question will be what will be the best crank for this type of cogs, compact, semi compact, standard? (50 34T, 52 36T, 53 39T)

    Also, what length of chain will I use? will still be 11s chain or it will need a longer one?

    Thank you.

  2. #2
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    Compact or sub compact depending on your climbs and level of fitness. Chain length is also affected by your chainstay length, so no way to calculate it without simply fitting it.

  3. #3
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    No one here has any clue what the best crankset for you would be.

    "what length of chain will I use? will still be 11s chain or it will need a longer one?"


    Length is length. s (for speed) is s. If you have 11 speed you will need and 11s chain. It's length is another matter.

  4. #4
    What the what???
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    If you were worried enough about the hills to go with 11-34 in back, I'd go with the 50/34 up front. The 34-34 combo will let you pretty much spin up anything. You might spin out on a descent with 50-11 but assuming you're not racing that would be plenty of speed for me.
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  5. #5
    flinty-eyed moderator
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    Ultegra 50-34 compact, Shimano 11 speed chain is ok.
    Dr. Cox: Lady, people aren't chocolates. Do you know what they are mostly? Bastards. Bastard-coated bastards with bastard fillings. But I don't find them half as annoying as I find naive bubble-headed optimists who walk around vomiting sunshine.

  6. #6
    'brifter' is f'ing stupid
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    Quote Originally Posted by GiantRider View Post
    Hello everyone

    So I'm building my new shimano groupset 105 r7000 for my Giant SCR. I purchased all except crankset. I chose 11-34T with long caged RD cause here on my place, there's a lot mountains and hills.

    So my question will be what will be the best crank for this type of cogs, compact, semi compact, standard? (50 34T, 52 36T, 53 39T)

    Also, what length of chain will I use? will still be 11s chain or it will need a longer one?

    Thank you.
    This post should be in 'components/wrenching' for obvious reasons, not general.

    It's a medium cage, Shimano doesn't make a long cage road derailleur. If it's hilly where you live the obvious choice would be the 50/34, unless you're pretty fit an would prefer a 52/36, or you're more fit and like a 53/39. 'Length' of chain? As others have posted the correct length is the right one...no one here can tell you what that is. '11 speed or longer' makes no sense. If your cassette is 11 speed then of course you will use an 11 speed chain.
    Sounds like what you need is a good shop to do the work for you.
    #promechaniclife

  7. #7
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    Quote Originally Posted by Opus51569 View Post
    You might spin out on a descent with 50-11 but assuming you're not racing that would be plenty of speed for me.
    At 100 rpm you would be pushing 36 mph, and you can go faster than that while coasting in a tight tuck on a downhill.

  8. #8
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    I can pedal to 140rpm, but I would be in a tuck.
    edit: and that would be at 125w, watch out!
    Last edited by duriel; 3 Weeks Ago at 11:21 AM.
    BANNED

  9. #9
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    Quote Originally Posted by duriel View Post
    I can pedal to 140rpm, but I would be in a tuck.
    The question is: can you could pedal at 140 rpm at 700w?
    Because 140 rpm at 100w is nothing.

  10. #10
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    OP - are you riding a bike right now?

    Use the tool in the link below: Interject your present gearing and, learn what its fixed-ratio has to offer toward new different sized gears and chainrings.

    BikeCalc
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  11. #11
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  12. #12
    'brifter' is f'ing stupid
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    Quote Originally Posted by dlb1918 View Post
    Someone has WAY too much time on their hands. That's ridiculous.
    #promechaniclife

  13. #13
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    OP, here's a video on how to size a chain. Like CX said, the right length is the right length.

    I use 50/34 with my 11-32 cassette.

    https://www.youtube.com/watch?v=O0YibMDWBAw&t=331s

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