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  1. #1
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    Ultegra 6600 - change freehub body?

    I ended up with a 6600 Ultegra wheelset (no cassette) in good shape. I would like to use these wheels on an older Trek road bike, but this freehub body only accepts 10 speed cassettes. Is it possible to swap out the freehub body for one that will accept a 7-speed cassette (with spacer, of course)? I'd like to use these wheels, but I'm not about to upgrade the whole group on the bike.

    Thoughts?

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    I also looked at that pdf but was uncertain how to interpret "same part". It is describing interchangeability between 6600, 5600, and R561 wheels. Is this comparison enough to rule out a different part? My assumption was that "same parts" means "these are literally the same part on different wheels. What is good for one set is good for another." Perhaps I am misreading the document. What am I missing?

  4. #4
    I let the dogs out AlphaDogg's Avatar
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    You can just slide a spacer on the existing freehub body before you put the 7spd cassette on. Problem solved.
    Quote Originally Posted by Andrew R Stewart View Post
    Weird spell/word check. "***" is "***". I'll never understand this computer. Andy.

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    Constant tinkerer FastJake's Avatar
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    Quote Originally Posted by AlphaDogg View Post
    You can just slide a spacer on the existing freehub body before you put the 7spd cassette on. Problem solved.
    Nope, not at all. Those 6600 wheels had a weird freehub attachment that Shimano no longer uses (and only used for a very short time), and had taller splines because they used an aluminum freehub body. The ONLY cassettes that will work on that freehub body are the 10S cassettes with the taller splines, unless you grind out another cassette to fit.

    It was really dumb because Shimano was defeating the whole purpose of the freehub that they created, which was placing the bearings much further out.
    Why "derailer" is the correct way to spell the gear-change mechanism: sheldonbrown.com/derailer.html

  6. #6
    I let the dogs out AlphaDogg's Avatar
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    Quote Originally Posted by FastJake View Post
    Nope, not at all. Those 6600 wheels had a weird freehub attachment that Shimano no longer uses (and only used for a very short time), and had taller splines because they used an aluminum freehub body. The ONLY cassettes that will work on that freehub body are the 10S cassettes with the taller splines, unless you grind out another cassette to fit.

    It was really dumb because Shimano was defeating the whole purpose of the freehub that they created, which was placing the bearings much further out.
    Oops.. I lied.
    Quote Originally Posted by Andrew R Stewart View Post
    Weird spell/word check. "***" is "***". I'll never understand this computer. Andy.

  7. #7
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    according to some of the stuff i just googled, it looks like the fixing bolt for the 6600 freehub looks like any other shimano hyperglide freehub fixing bolt. if so (and i could be wrong here) you should be able to buy a 7 speed hyperglide freehub and attach it. some spacers, as you mentioned, may be necessary.

    here's the pic of the fixing bolt for the 6600 that i found on several online sites (98 cents):
    5f51626861574f333557334d65714370734c51-260x260-0-0.jpg
    and as another post mentioned, a spacer before or after the 7 speed cassette will work too. i've run a 7 speed freehub with five cogs and requisite spacers without trouble.
    Last edited by hueyhoolihan; 05-16-12 at 10:48 PM.

  8. #8
    bike whisperer Kimmo's Avatar
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    Quote Originally Posted by hueyhoolihan View Post
    i've run a 7 speed freehub with five cogs and requisite spacers without trouble.
    Why on Earth would you do that? Got an indexed 5spd lever you really like?

  9. #9
    he said member ls01's Avatar
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    Quote Originally Posted by Kimmo View Post
    Why on Earth would you do that? Got an indexed 5spd lever you really like?
    lol!
    Originally posted by Whyfi "Who needs thumbs when you can lick yourself?"

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    Quote Originally Posted by hueyhoolihan View Post
    according to some of the stuff i just googled, it looks like the fixing bolt for the 6600 freehub looks like any other shimano hyperglide freehub fixing bolt. if so (and i could be wrong here) you should be able to buy a 7 speed hyperglide freehub and attach it. some spacers, as you mentioned, may be necessary.

    here's the pic of the fixing bolt for the 6600 that i found on several online sites (98 cents):
    5f51626861574f333557334d65714370734c51-260x260-0-0.jpg
    and as another post mentioned, a spacer before or after the 7 speed cassette will work too. i've run a 7 speed freehub with five cogs and requisite spacers without trouble.
    The 6600 hub is different than the wheel set. This is the hub. http://techdocs.shimano.com/media/te...9830728262.pdf
    Which one do you have?

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