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Ultegra 6600 vs 6700 bottom bracket?

Mr PlumMr Plum Posts: 1,097
edited March 2017 in The workshop
What's the 'upgrade'...?

My Google-Fu is poor and I can find very little info about any differences between the 6600 and 6700 bottom bracket. The only reason I ask is that I can find the 6700 cheaper than the 6600 and I need a new bottom bracket for my 6600 chainset. Literally about to order the 6700 anyway so it's just my curiosity that needs fulfilling...
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  • Different colour?! Am sure it makes a big performance difference ;-)
    Dolan Preffisio
    2010 Cube Agree SL
  • Shimano techdocs website http://techdocs.shimano.com

    Ultegra here

    6600 is HollowTech-II, not sure about 6700...

    [update] 6600 is a flatbar component, 6700 is a roadbike component. They dont state they are compatible but its likely as both are HollowTech

    Shimano Compatibility Chart
    Invacare Spectra Plus electric wheelchair, max speed 4mph :cry:
  • Mr PlumMr Plum Posts: 1,097
    OB - cheers for the links. The 6600 and 6700 are both Hollowtech II bottom brackets and are 100% compatible, I was just wondering what the actual differences are in terms of any 'upgrade' on the newer 6700? Better bearings and seals? As far as I can tell they're the same...?
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  • jomojjomoj Posts: 777
    [update] 6600 is a flatbar component, 6700 is a roadbike component. They dont state they are compatible but its likely as both are HollowTech

    6600 is just the last version of Ultegra, its not flatbar specific.
    As for the difference, probably none. they'll both work so get the cheapest - or even 105. No-one will know...
  • keef66keef66 Posts: 13,286
    Get a Tiagra one if you want to save your pennies. They are all interchangeable
  • timtaktimtak Posts: 28
    Alas it seems that an SM-FC 5600 (which I purchased cheap) does not fit my SM-FC 6601 despite rumour to the contrary.

    This could be due to the IA vs GA marking. Perhaps. The markings on mine were worn out.

    Googling I find
    http://www.ebay.com/itm/Shimano-105-Bot ... 1655292540
    "Fits only frames with Italian thread, not compatible with BSA thread

    I seem to remember that mine is BSA. So while any Holotech II BB may work with any Holotech II BB, you need to watch out for thread
    Italian 70mm 36x24 metric thread
    British 68 MM BSA or 68BSA I think that this is also called "BC1.37 24T"
    British MTB 73mm

    They also have ones marked "Road" and "Mountain." I wonder if that makes any difference. Yes, but only i think to length of the central plastic tube which can be swapped, perhaps
    http://www.tobiasfeltus.com/site/blog/t ... -on-a-mtb/

    I can just about see worn out "BC1.37 24T" markings on mine. Oops.

    I wonder if the tiagra is as good as an ultegra since they are cheap. A 4600 in 68BSA can be had for 13USD from China. I think I will go with Ultegra which in its 6800 version can be had for 17USD from Japan including adapter so I can use an old bottom bracket wrench. From 69800 the dimply bit for tightening it up is smaller, so an adapter or new tool is need apparently.
  • keef66keef66 Posts: 13,286
    timtak wrote:
    Alas it seems that an SM-FC 5600 (which I purchased cheap) does not fit my SM-FC 6601 despite rumour to the contrary.

    This could be due to the IA vs GA marking. Perhaps. The markings on mine were worn out.

    Googling I find
    http://www.ebay.com/itm/Shimano-105-Bot ... 1655292540
    "Fits only frames with Italian thread, not compatible with BSA thread

    I seem to remember that mine is BSA. So while any Holotech II BB may work with any Holotech II BB, you need to watch out for thread
    Italian 70mm 36x24 metric thread
    British 68 MM BSA or 68BSA I think that this is also called "BC1.37 24T"
    British MTB 73mm

    They also have ones marked "Road" and "Mountain." I wonder if that makes any difference. Yes, but only i think to length of the central plastic tube which can be swapped, perhaps
    http://www.tobiasfeltus.com/site/blog/t ... -on-a-mtb/

    I can just about see worn out "BC1.37 24T" markings on mine. Oops.

    I wonder if the tiagra is as good as an ultegra since they are cheap. A 4600 in 68BSA can be had for 13USD from China. I think I will go with Ultegra which in its 6800 version can be had for 17USD from Japan including adapter so I can use an old bottom bracket wrench. From 69800 the dimply bit for tightening it up is smaller, so an adapter or new tool is need apparently.

    Yes, newer stuff (6800, 5800 etc) is smaller outside dimension so need different tool or adapter. Bearings are the same. MTB ones have longer plastic tube and slightly more threads (for spacers, chain devices etc) sample of 2 but my ultegra one has lasted longer than the 105 it replaced
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