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  1. #1
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    Can my Shimano Fh-M756 hubs be converted to 20mm?

    I bought this wheelset before I knew too much about them, and now realize that a 20mm through axle is what I want. These hubs have the 9mm QR. I have read that some hubs can be converted with new endcaps, but I can't find any info on the compatibility of these ones.

    So, can my FH-M756 Shimano XT hubs be converted from a 9mm QR to 20mm through axle?

    Also, it seems I cannot use a centerlock rotor on a 6 bolt hub, and there is no adaptor that will fix this. Is this correct? I have a nice Shimano Ice Tech centerlock rotor, but didn't realize until after the fact my Shimano hubs were 6 bolt. Boo!

  2. #2
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    Can't find much info on the discount rotors I found (goodbye Ice Techs, I will save you for another build!).

    Basically, Torq-lite rotors or Ashima Airotor? From what I can tell, both are weight weenie rotors. I honestly just need something tough for a clyde-- weight isn't that big of a deal. They are just under $20, which is how much I have to fix this problem. I need a 203mm 6-bolt, which all seem to run much higher on average than centerlock? Any better suggestions?

  3. #3
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    Quote Originally Posted by Bikemaya View Post
    I bought this wheelset before I knew too much about them, and now realize that a 20mm through axle is what I want. These hubs have the 9mm QR. I have read that some hubs can be converted with new endcaps, but I can't find any info on the compatibility of these ones.

    So, can my FH-M756 Shimano XT hubs be converted from a 9mm QR to 20mm through axle?
    No, they can not be converted.

    Quote Originally Posted by Bikemaya View Post
    Also, it seems I cannot use a centerlock rotor on a 6 bolt hub, and there is no adaptor that will fix this. Is this correct?
    Yes, a centerlock rotor can not be used on a 6-bolt hub.
    Quote Originally Posted by pvd
    Time to stop believing the hype and start doing some science.
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  4. #4
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    Shimano Saint Disc Hub Front M800 | Buy Online | ChainReactionCycles.com

    That could kinda sort you out in a nice way for cheap.


    Magura

  5. #5
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    Hmmm... that's a good idea!

    I imagine the Saint hubs are better than XT, correct?

    Ack, just read the reviews. They say you need the OVERSIZED centerlock rotors. I am pretty sure I have a standard one.

    I looked for more XT hubs, but they only come in the 15mm version. Need the 20mm if I am going to do this.

    and... now that I am thinking about it... how expensive is it to have an LBS lace a new hub in? I sure don't have the tools or know how to. That will be a cost on top of everything else too :/

  6. #6
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    Quote Originally Posted by Bikemaya View Post
    Hmmm... that's a good idea!

    I imagine the Saint hubs are better than XT, correct?

    Ack, just read the reviews. They say you need the OVERSIZED centerlock rotors. I am pretty sure I have a standard one.

    I looked for more XT hubs, but they only come in the 15mm version. Need the 20mm if I am going to do this.

    and... now that I am thinking about it... how expensive is it to have an LBS lace a new hub in? I sure don't have the tools or know how to. That will be a cost on top of everything else too :/
    Shoot, I missed the "oversize" part about the M800.

    Shimano XT Disc Hub Front 20mm M776 | Buy Online | ChainReactionCycles.com

    To rebuild a wheel, is no big deal. It takes time and patience, and a $5 nipple spanner.
    You can use your fork as wheel truing stand.


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  7. #7
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    The Zee will work too and uses a standard centerlock rotor

    Shimano Zee Hub Front M640 | Buy Online | ChainReactionCycles.com
    Former bicycle mechanic for 8 years, current soil scientist.

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  8. #8
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    Are the Zee's better than XT? They are listed as 640's so that seems to suggest a step down to SLX level?

  9. #9
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    Quote Originally Posted by Bikemaya View Post
    Are the Zee's better than XT? They are listed as 640's so that seems to suggest a step down to SLX level?
    Zee and SLX is frequently exactly the same (minus the color that is).
    So the XT is the better part, at least according to Shimano.


    Magura

  10. #10
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    Quote Originally Posted by Bikemaya View Post
    Are the Zee's better than XT? They are listed as 640's so that seems to suggest a step down to SLX level?
    Zee is a heavier duty group than XT, designed as a lower priced Saint group. It is on par with SLX level hubs which IME have been at least as durable and compared to the newer XT hub models more durable.
    Former bicycle mechanic for 8 years, current soil scientist.

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  11. #11
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    Damn, you guys are making this tough!

    I chose the XT wheelset over a lower one he showed me based on how buttery smooth the hubs were in comparison. I don't want to lose the butter if I go with Zee! But, likewise, if XTs are a bit wimpy, I may be busting them. I haven't busted the hubs on my cheapo full rigid, so I guess I am not *that* hard on hubs...

  12. #12
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    Quote Originally Posted by Bikemaya View Post
    Damn, you guys are making this tough!

    I chose the XT wheelset over a lower one he showed me based on how buttery smooth the hubs were in comparison. I don't want to lose the butter if I go with Zee! But, likewise, if XTs are a bit wimpy, I may be busting them. I haven't busted the hubs on my cheapo full rigid, so I guess I am not *that* hard on hubs...
    Depending how heavy you are (the 200# mark is usually where things begins to fail left and right), you have the freedom to pick fairly light components.
    I would be very surprised if you're able to overload a XT front hub.
    In general the seals have been better on XT than the lower groups. That would be a deciding factor to me, as it cuts back on maintenance.
    The difference in cost, is negligible.


    Magura

  13. #13
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    Ok, I am having a WTF?! moment as I dug around a bit more to try to decide between the two. Check out the warnings on the left of this Shimano Tech Doc for the XT m776: http://techdocs.shimano.com/media/te...9830616069.PDF

    Not designed for off-road bicycle riding?! What the hell are XTs made for?! A jaunt around the effin neighborhood?!

    I tried to find a similar document for the Zee, but there doesn't seem to be one. Is that warning like a default warning for all components to release Shimano from liability? I would expect to see such a thing on Acera level and below, but not on freakin XT components! I thought I had this figured out too, I was going for the XT (I looked up the tech doc just to find out the year of the hub, only to double check what multiple sites had...) :/ I haven't had my hands on the Zee, so I wanted to stick with something I know I already like.

    I am over 200#, which is why I am making a big deal about this. A catastrophic hub failure is NOT something I need... I blew over components like the bars, stem, and derailleurs cause failure of those won't hurt me badly. Stressed much more over tires, hubs, crankset, and fork (seatpost was easy. Thomson, no questions. Done ). But like I said, I haven't bombed my shitty hubs on the entry level bike with a rigid fork (yet), so I know I am not being *too* hard on anything (atm, the gentleness is mostly due to bike limitations preventing me from trying out very rocky and steep areas). The lack of failure on what I have been riding makes me think I just need something tough, but not necessarily something for hard-riding DH riders. At the very least, it should be intended for off-road use...

  14. #14
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    If you're hard on components, the Zee is the way to go.
    It's either that, or cough up for a Hadley.

    The "not designed for off road bicycle riding" seems to be printed on just about anything.

    Magura

    EDIT: or if you have a friend that's got access to a machine shop, have one custom made.
    I can supply drawings if needed, as I make my own hubs generally.
    Last edited by Mr.Magura; 01-05-2013 at 02:56 PM.

  15. #15
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    Ya, I have seen no evidence I am hard on components, and I am more defaulting to my weight as the source of any stress I put on stuff. But people who weigh half as much as me destroy bike parts instantly that I have been riding on for months, so I am realizing that it isn't a very reliable gauge as to how hard I am on my gear.

    *googles Hadley*

    Hmmm... the NOS versions range from $100-$150... I will keep those in the back of my mind when browsing around the bargain bins. Might be able to pick one up stupid cheap one day They are way cheaper than Kings...

    *raises eyebrow*
    MTB GT Hadley 32h Rear Hub Disc 135mm | eBay

    Used GT Bicycles Hadley Front Hub 32h Front Disc Mount 20mm | eBay

    4 bolt? EH?! I don't know if I have seen that before... Good deal for someone out there though, better hurry!

    I thought 'Not intended for offroad use' was limited to wally world bikes... sheesh.

  16. #16
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    Quote Originally Posted by Bikemaya View Post
    Ya, I have seen no evidence I am hard on components, and I am more defaulting to my weight as the source of any stress I put on stuff. But people who weigh half as much as me destroy bike parts instantly that I have been riding on for months, so I am realizing that it isn't a very reliable gauge as to how hard I am on my gear.
    By hard on components, I meant either by riding style or weight, or both

    A used Hadley can't be all that expensive in your neck of the woods?
    If they get new bearings, they will be as new, and a set of bearings for the front, are like $20.
    4 bolt rotors are hard to come by these days AFAIK.

    Magura

  17. #17
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    I would grab that ebay one in an instant if I didn't also have to hunt down a 4-bolt 203mm rotor for it. So far, I am finding only Hope rotors, around $32, but nothing in 203mm. The auction is for a take-off. Cosmetic damage only, good as new as far as I am concerned!

  18. #18
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    Quote Originally Posted by Bikemaya View Post
    I would grab that ebay one in an instant if I didn't also have to hunt down a 4-bolt 203mm rotor for it. So far, I am finding only Hope rotors, around $32, but nothing in 203mm. The auction is for a take-off. Cosmetic damage only, good as new as far as I am concerned!
    Well, depending if you already have bought brakes, you could go 183mm 4 bolt, and run Zee brakes. They offer immense amounts of power, even on a 183mm.


    Magura

  19. #19
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    Already bought the brakes and the 203mm adapters. I got the M675's for 90 bucks a pop!

    Hmmm...

    Hope Mono Mini/M4 Disc Brake - 180mm | Buy Online | ChainReactionCycles.com

  20. #20
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    Quote Originally Posted by Bikemaya View Post
    Already bought the brakes and the 203mm adapters (I think the brakes are 180mm). I got the M675's for 90 bucks a pop!
    Then it's either the Zee hubs, Ebay Hadleys, or custom made.

    Hadleys will be a long term investment, so will custom made.


    Magura

  21. #21
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    That's the ones I found a swell. It's really not a bad deal.


    Magura

  22. #22
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    I am finding two types of 4-bolt; Coda and Rohloff. Are they the same size bolts?

  23. #23
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    Ok, maybe a stupid question, but I need to ask before I buy...

    The auction for the Hadley says the axle is not included. Umm... that is normally part of the hub, isn't it? Are they cheap?

    I don't know the finer details of hubs, so if axles are expensive, that might be a dealbreaker.

  24. #24
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    Quote Originally Posted by Bikemaya View Post
    I am finding two types of 4-bolt; Coda and Rohloff. Are they the same size bolts?
    Rohloff is a different hub specific size.


    Magura

  25. #25
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    Quote Originally Posted by Bikemaya View Post
    Ok, maybe a stupid question, but I need to ask before I buy...

    The auction for the Hadley says the axle is not included. Umm... that is normally part of the hub, isn't it? Are they cheap?

    I don't know the finer details of hubs, so if axles are expensive, that might be a dealbreaker.
    20mm through axles are fork specific, and comes with the fork


    Magura

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