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  1. #1
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    126 rear spacing and cassettes

    What is the largest cassette you can run on a 126mm rear without cold setting the frame? 6,7,8,9?
    Thanks

  2. #2
    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by Downshift
    What is the largest cassette you can run on a 126mm rear without cold setting the frame? 6,7,8,9?
    Thanks
    You can get 8. If you check this page:

    http://sheldonbrown.com/k7.html

    and scroll down to the section titled "8 Of 9 On 7", it is explained there. If you look around, you can still get NOS 105 hubsets that have a 126mm rear hub. These are pretty nice.
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    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by cascade168
    You can get 8. If you check this page:

    http://sheldonbrown.com/k7.html

    and scroll down to the section titled "8 Of 9 On 7", it is explained there. If you look around, you can still get NOS 105 hubsets that have a 126mm rear hub. These are pretty nice.
    You can also run a 130 mm hub in a bike with a 126 spacing without cold setting the frame. Frames have enough flex in the rear triangle to accommodate an extra 4mm. Going to a 135 would be too much but 130 is okay. I've done it on a couple of bikes without any problems other than being tight to install or remove the wheel.
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    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by cyccommute
    You can also run a 130 mm hub in a bike with a 126 spacing without cold setting the frame. Frames have enough flex in the rear triangle to accommodate an extra 4mm. Going to a 135 would be too much but 130 is okay. I've done it on a couple of bikes without any problems other than being tight to install or remove the wheel.
    Oh, I agree with that - absolutely. But, personally, I hate installing a rear wheel while trying to spread the chainstays at the same time. That's a royal PITA. I like dropouts to be about 1mm wider than the hub O.L.D. That is sooooo much easier.
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    Sweet. I looked all over for that article and couldn't find it.

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    Klaatu barada nikto cascade168's Avatar
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    Quote Originally Posted by Downshift
    Sweet. I looked all over for that article and couldn't find it.
    Look on the page I linked to and go almost all the way to the bottom. It's just a few sections up from the bottom, just below this section:

    "Upgrading From 6-/7-speed (126 mm) to 8-/9-speed (130 mm)"

    BTW, that whole page is well worth reading. There is a wealth of useful information there for anyone wanting to do speed upgrades on Shimano hubs.
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  7. #7
    me have long head tube TallRider's Avatar
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    7-speed freehubs are designed with 126mm spacing. 8/9/10 speed freehubs (which, from Shimano, are interchangable; an 8/9/10 speed cassette fits on the same sized freehub) are designed with 130mm spacing.

    Specifically, steel or titanium frames are flexible enough to spread the frame that extra 4mm to run a 130mm rear hub in a frame designed for 126mm.

    But alternately, you could take a 130mm-spaced hub, remove a washer or two on the non-drive side of the axle, and get 126mm spacing with a slightly re-dished wheel. Not an ideal solution (results in a weaker wheel) but it works okay, actually. Provided you're quite good with wheelbuilding. If you do this with a Shimano hub, it's not that much different than a Campy hub with unmodified spacing (Campy hubs have more dish than Shimano, because of the flange placement).

  8. #8
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by timcupery
    But alternately, you could take a 130mm-spaced hub, remove a washer or two on the non-drive side of the axle, and get 126mm spacing with a slightly re-dished wheel. Not an ideal solution (results in a weaker wheel) but it works okay, actually. Provided you're quite good with wheelbuilding. If you do this with a Shimano hub, it's not that much different than a Campy hub with unmodified spacing (Campy hubs have more dish than Shimano, because of the flange placement).
    Not an idea that I'd copy. If you scan the posts for any period of time you will read of lots of folks who have spoke breakage problems with rear wheels. The issue is that on 8-speed hubs and above, it takes a careful wheelbuild to get adequate tension on the non-drive side spokes. If you respacer and redish an 8-speed hub to fit 126mm dropouts, you are going to worsen that problem. Sometimes there are things that I'd do on a personal bike that I wouldn't do on a customer's bike because I have to guarantee my work. I'm not going to try this one on either.

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