New chainrings for Ultegra 6700

Intherain
Intherain Posts: 86
edited May 2014 in Workshop
I am looking to switch my Ultegra 6700 compact chainset to a double.

Am I right in thinking I can just buy some larger chainrings and substitute them for what is already there?

If so, can anyone recommend some good ones to go for? I've seen some FSA ones but wondered if there are any other alternatives which would fit.

Thanks
Yes, I like riding in the rain...

Comments

  • ic.
    ic. Posts: 769
    No, you can't.

    6700 compacts have a BCD of 110mm

    6700 double (53/39) chainrings have a BCD of 130mm

    You'll need new cranks too.
    So better to sell your compact and buy a double

    However, new 6800 use the same BCD for all rings. Handy!
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  • Intherain
    Intherain Posts: 86
    Thanks fro your reply but dammit!

    Is BCD the 'spider arm' bit the chainrings bolt on to?

    In that case can anyone recommend a sensibly priced shimano compatible chainset? I might as well replace it with something which does not look as minging!
    Yes, I like riding in the rain...
  • Matthewfalle
    Matthewfalle Posts: 17,380
    Anything will work - head off into the deals and have a look at what you fancy. Just double check b/b bits.
    Postby team47b » Sun Jun 28, 2015 11:53 am

    De Sisti wrote:
    This is one of the silliest threads I've come across. :lol:

    Recognition at last Matthew, well done!, a justified honour :D
    smithy21 wrote:

    He's right you know.
  • ba68
    ba68 Posts: 156
    I have a lightly used 53/39 FSA Gossamer Pro with bottom bracket, pm me if interested.
  • DiscoBoy
    DiscoBoy Posts: 905
    Or, you could buy some mid-compact 52/36 rings by Praxis Works or the like in 110BCD.
    Red bikes are the fastest.
  • Intherain
    Intherain Posts: 86
    Thanks for the suggestions. I saw CRC had a good sale so have gone for a double 6700.

    Budget will not stretch to the juicier looking chainsets out there. The ones I like all look to be around £300 and I want to be able to fit a stages eventually...
    Yes, I like riding in the rain...
  • crankycrank
    crankycrank Posts: 1,830
    DiscoBoy wrote:
    Or, you could buy some mid-compact 52/36 rings by Praxis Works or the like in 110BCD.
    This^^^. TA is another option and there are a couple other aftermarket chainring mfrs. that make larger rings for compact cranks. Just be aware that none will shift quite as sharp as the Shimano rings (Shimano shapes the teeth to help grab the chain) but it's usually not a major difference and isn't an issue for many people.

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