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  1. #1
    Seņor Member 4Rings6Stars's Avatar
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    Replace freehub body / axle on Shimano WH 6700 rear wheel

    In my travels, I somehow ended up with an Ultegra rear wheel, however the hub is just the shell, no innards.

    Any ideas where I could find a replacement axle/freehub body? Is it worth it to do so?

    Wheel looks like this: http://www.shimano.com/publish/conte...-.wh_road.html
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  2. #2
    Senior Member vredstein's Avatar
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    Quote Originally Posted by 4Rings6Stars View Post
    In my travels, I somehow ended up with an Ultegra rear wheel, however the hub is just the shell, no innards.

    Any ideas where I could find a replacement axle/freehub body? Is it worth it to do so?

    Wheel looks like this: http://www.shimano.com/publish/conte...-.wh_road.html
    axle unit-http://www.bikeparts.com/search_results.asp?ID=BPC137283
    freehub-http://www.bikeparts.com/search_results.asp?ID=BPC361259

    Under $100 if that's worth it for you.
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  3. #3
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    Given all that you need, it'll probably be cheaper to buy an entire hub and swap the parts over. You can get an Ultegra 6700 rear hub for under $80 here: http://www.ribblecycles.co.uk/sp/roa...ub/SHIMHUBR320

    I've been lead to believe (researching the topic for my own purposes) that any Shimano hub will work as a parts donor. The only potential mismatch is the dust seals.

  4. #4
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    Given all that you need, it'll probably be cheaper to buy an entire hub and swap the parts over. You can get an Ultegra 6700 rear hub for under $80 here: http://www.ribblecycles.co.uk/sp/roa...ub/SHIMHUBR320
    Those are different hubs. Most of the pieces are interchangable even though the part numbers are different. The hub shell is different on the wheelsets- 20 hole and straight pull spokes vs. 32/36 hole and j-bend spokes. I've always found it queer that Ultegra wheelsets don't use the Ultegra hubs that we know and love.

    $80? I wish. Those are Euros or pounds or something. Ultegra hubs over here cost in the $120 neighborhood.

  5. #5
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    Quote Originally Posted by reddog3 View Post
    Those are different hubs. Most of the pieces are interchangable even though the part numbers are different. The hub shell is different on the wheelsets- 20 hole and straight pull spokes vs. 32/36 hole and j-bend spokes. I've always found it queer that Ultegra wheelsets don't use the Ultegra hubs that we know and love.

    $80? I wish. Those are Euros or pounds or something. Ultegra hubs over here cost in the $120 neighborhood.
    I know they are different hubs. My point was that it's potentially cheaper to buy an entire hub and use it for parts than buying all those parts individually. In my research regarding a 8/9/10 speed freehub to convert an old RSX hub'd wheel I have I found that I can buy a complete Tiagra rear hub for less money than I can buy just the freehub for that same hub. Sounds crazy but it's true.

    And yes, if you click on the link and set the currency to dollars, Ribble is selling Ultegra 6700 rear hubs for $78, not Euros or pounds. They also have Tiagra rear hubs for under $20.

  6. #6
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    Quote Originally Posted by reddog3 View Post
    I've always found it queer that Ultegra wheelsets don't use the Ultegra hubs that we know and love.
    Shimano's prebuilt wheel hubs are far different from their component hubs despite the use of the same model series names. I have a set of "105" wheels (WH-R560) and the hubs look nothing like the regular 105 hubs on my standard wheels. They do have similar internals and the freehub body seems to be identical.

  7. #7
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    Why not just look at the tech docs, this gives you the part break down of all the components, and order what you need

    6700 wheel
    http://techdocs.shimano.com/media/te...9830753824.pdf

    You can see if any of the hub parts are compatible here
    http://techdocs.shimano.com/media/te...9830670816.pdf

  8. #8
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    I spent some time tonight taking apart three Shimano hubs (RSX100, Deore M525, and Ultegra 6500) and found some interesting differences. While they will all mount in place of each other, there are some small dimensional differences that could pose a problem.

    The most critical difference is what I'll refer to as the "cassette offset". This is the distance from freehub mounting surface to the surface which stops the cassette from sliding further onto the freehub body. The Ultegra hub measures 6mm while the RSX hub is 4.9mm and the Deore 4.3mm. The Ultegra hub is machined noticeably deeper than the other two. Putting the Ultegra freehub body in place of either the RSX or Deore results in an obvious gap between the freehub body and hub. The difference between the RSX and Deore seems negligible. With the Deore mounted in place of the RSX, the cassette is still plenty far away from the spokes.

    The seal area of the three hubs are all different. Both the Ultegra and Deore used a 18.2mm diameter dust cap ID while the RSX was 17.5mm. The dust cap height and distance from the edge of the freehub are different amongst the three. Basically, if you find a comaptible freehub from another series, expect to need the cone and any seals from that hub too.

    Finally, the Ultegra and RSX hubs both use 33.8mm long fixing bolts while the Deore uses a 36.8mm long bolt. The all gave basically the same amount of actual thread engagement though as the start of the thru hole is counterbored and only acts as a pilot for the bolt. The Deore hub is fully counterbored out past the major diameter of the thread whereas both the RSX and Ultegra hubs are only machined far enough to just let the bolt slip into the hole. You can still see remnants of the thread and it appears as if the thread has been partially stripped. Weird.

    Looking at Universal Cycles website, it appears as if Ultegra 6500 and 6600 (no 6700 picture unfortunately), 105 5500, and Sora 3300 all use a similar freehub judging by the cassette offset. 105 5700, Tiagra 4500, and all MTB hubs (that are pictured) except for XTR M985/975/970 use similar freehubs. The MTB hubs (including the Deore I checked) use a different washer behind the freehub though. It's larger in diameter and has the sides cut away. The RSX and Ultegra hubs use exactly the same washer so it seems safe to assume that all road hubs use the same washer.

    Freehub with 6mm cassette offset:



    Freehub with ~4.5mm cassette offset:



    If I had to guess based on what I've seen and the picture of the hub shell in the Shimano tech docs (they don't show the backside of the freehub), you need a 6mm offset freehub meaning any Ultegra hub or the 105 5500 or Sora 3300 freehub (again assuming Universal Cycles' pictures are correct).

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