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  1. #1
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    Chainrings or Crankset (compact vs standard)

    Hi,

    I have standard crankset with Shimano Ultegra di2.
    Thinking to switch crankset to compact crankset as standard seems too big.
    few questions:
    1. Is it possible to replace chainrings instead of whole crackset?
    2. If i need whole new crankset, any recommendations carbon vs aluminum vs steel ?

    My rear cassette is 11-25, my next option will be to change to 11-28 hopefully that will help as well!

    Thanks!

  2. #2
    1337 FPSDavid's Avatar
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    1) Nope, standard and compact use a different BCD (bolt circle diameter). Standard uses 130mm, Compact uses 110mm.
    Last edited by FPSDavid; 05-21-13 at 05:57 PM.
    2012 Cannondale CAAD10 3

  3. #3
    Senior Member
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    I've researched the crap out of this. Summary: you're pooched. Head to eBay

  4. #4
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    Thanks for info!

    will do some shopping!

    will try 11-28 for the back and will go from there!

  5. #5
    SuperGimp TrojanHorse's Avatar
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    What are you trying to achieve? There are loads of folks who prefer the standard crank... if you don't live in a very hilly area you may too.

  6. #6
    Senior Member spectastic's Avatar
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    Hey, I'm planning on buying a new bike that has an ultegra 50/34 crank. Would you be interested in swapping?

    I believe this is the 6700-G version, so it would work well with your Di2
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  7. #7
    Senior Member Homebrew01's Avatar
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    Quote Originally Posted by spectastic View Post
    Hey, I'm planning on buying a new bike that has an ultegra 50/34 crank. Would you be interested in swapping?

    I believe this is the 6700-G version, so it would work well with your Di2
    If OP is not interested, you could try the "For Trade" thread (unless you need to be a paid member ?)
    Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike

  8. #8
    Senior Member spectastic's Avatar
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    no I'm not a premium member.

    you hear that OP, you better be interested !!!
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  9. #9
    pan y agua merlinextraligh's Avatar
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    Quote Originally Posted by zaliaskalnas View Post
    Hi,

    2. If i need whole new crankset, any recommendations carbon vs aluminum vs steel ?


    If you decide you need a compact crankset, I'd stay with Shimano. Part of what makes di2 shift so well is the Shimano chainrings. Front shifting depends in part on how stiff the chainrings are, and how they are ramped and pinned. No one makes better chainrings than Shimano.

    I wouldn't buy Di2, and then degrade the front shifting by swapping out for a non shimano crank.

    One good option would be the new DA crankset, which can accomodate standard size, and compact chainrings on the same crank, giving you the optionof going back and forth.
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

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