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Old 05-16-12, 07:46 PM   #1
klausman
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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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Old 05-16-12, 08:05 PM   #2
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No. http://techdocs.shimano.com/media/te...9830728264.pdf
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Old 05-16-12, 08:17 PM   #3
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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?
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Old 05-16-12, 09:02 PM   #4
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You can just slide a spacer on the existing freehub body before you put the 7spd cassette on. Problem solved.
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Old 05-16-12, 09:30 PM   #5
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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.
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Old 05-16-12, 09:31 PM   #6
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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.
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Old 05-16-12, 09:43 PM   #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):

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.
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File Type: jpg 5f51626861574f333557334d65714370734c51-260x260-0-0.jpg (18.0 KB, 7 views)

Last edited by hueyhoolihan; 05-16-12 at 09:48 PM.
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Old 05-17-12, 02:06 AM   #8
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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?
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Old 05-19-12, 01:37 PM   #9
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Why on Earth would you do that? Got an indexed 5spd lever you really like?
lol!
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Old 05-19-12, 04:22 PM   #10
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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):

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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