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6750 7950 compact chainsets

stokey1964stokey1964 Posts: 454
edited March 2010 in Workshop
My wifes bike is currently running DA 7900 with a 53/39 chainset

She fine until we hit the bigs hills and then she struggles a bit

I want to change it to a compact and have been concidering either a Ultegra 6750 or DA 7950 chainset

I have read that the spacing on the chainriings is wider apart than previous models.

Would these still work with a DA 7800 shifter and 7800 front mech, or am I better just fitting an older Ultegra 6650 compact chainset




  • John.TJohn.T Posts: 3,698
    If you already are running a DA 7900 crankset then DA 7950 or Ultegra 6750 will be the same width. If you have DA 7800 shifters and mech they will work the same as now. If you meant you are running a DA 7800 crankset then you will be better off using the Ultegra 6650.
  • stokey1964stokey1964 Posts: 454
    Cheers John

    meant to say she is running DA 7800 groupset not 7900

    I expected as much, so I am limited to 6650 or the R700 crankset then

  • John.TJohn.T Posts: 3,698
    I would not try the 7950 or 6750 as they may give problems. You do not have to stick with Shimano though. Any set that uses a clamp type LH crank will fit your BB. I have FSA Gossamer on 2 bikes and they are fine.
  • redddraggonredddraggon Posts: 10,862
    Should work fine TBH.
    I like bikes...

  • JohnnyAllezJohnnyAllez Posts: 785
    Good prices going about on 105 compact chainsets, look just like Ultegra 6600 if that`s what you`re wanting :) Hollow forged arms etc.
    Jens says "Shut up legs !! "

    Specialized S-Works SaxoBank SL4 Tarmac Di2
  • Mark1962aMark1962a Posts: 47
    Stokey - I just picked up an Ultegra 6650 SL Compact chainset on Evans Website for £120 - It even came with a 6600 SL Bottom Bracket - absolute snip I thought and looks great in Ice Grey and black. Its OEM so no fancy packaging and Evans delivered in 48 hrs under their Free Delivery. FCR600 is £85 but not as hard wering as the 700 and a bit heavier as not hollowtech.

    2009 S Works SL2
    2009 Specialized Tarmac Expert
    2007 Specialized Tarmac - Single Speed conversion!
    2010 Specialized Rockhopper SL Expert MTB
    2009 Specialized P2 All Mountain
    All in need of a Bigger Garage............
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