Hubs which convert between 177 and 197 spacing. Is there such a thing?- Mtbr.com
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  1. #1
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    Hubs which convert between 177 and 197 spacing. Is there such a thing?

    Bit of a long shot but is there a hub available that converts between 177 and 197 spacing by changing end caps? Would be great as could then share one wheel set between my Wednesday and upcoming Big fat Dummy. Thanks.

  2. #2
    fat guy on a little bike
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    there was a local convinced his Hope 197 hub was "convertible" to 177. Turned out it could only be changed to a 190 QR.

    I have not seen any hubs that do this, good luck.

  3. #3
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    I can't be done.
    The difference is in the hub body....using spacers would put the disc rotor and free hub too far inboard

  4. #4
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    Quote Originally Posted by the mayor View Post
    I can't be done.
    The difference is in the hub body....using spacers would put the disc rotor and free hub too far inboard
    D'oh! Got it thanks. Good idea though.

  5. #5
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    Quote Originally Posted by the mayor View Post
    I can't be done.
    The difference is in the hub body....using spacers would put the disc rotor and free hub too far inboard
    Could a conversion kit be made to go from 177 to 197 like the boost conversations wolf tooth and mrp make?

  6. #6
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    Quote Originally Posted by gregorysmithj1 View Post
    Could a conversion kit be made to go from 177 to 197 like the boost conversations wolf tooth and mrp make?
    Not likely. You would need to do one of two very unlikely options.

    1. a 10mm spacer on each side, which would require a 10mm brake rotor shim, but more difficult still, your derailleur would need to swing 10mm beyond its normal limit.

    2. a 20mm spacer on the brake side, a 20mm brake rotor shim, and to re-dish the rear rim by 10mm.

    Those are ugly options.

  7. #7
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    Quote Originally Posted by GuitsBoy View Post
    Not likely. You would need to do one of two very unlikely options.

    1. a 10mm spacer on each side, which would require a 10mm brake rotor shim, but more difficult still, your derailleur would need to swing 10mm beyond its normal limit.

    2. a 20mm spacer on the brake side, a 20mm brake rotor shim, and to re-dish the rear rim by 10mm.

    Those are ugly options.
    Maybe option 2 would work. If thru-axle end caps are available for your pugs hubs, there is an ebay seller called "MBT Tools" that could probably fab the spacers in option 2 above. If you want to go that route, I'd dish the wheel 13.75mm to the left, instead of the standard 17.5 on the Pugs. That would probably give you acceptable (but not perfect) dish for both the pugs and the Big Fat Dummy.
    Last edited by Lars_D; 01-06-2018 at 10:48 AM.
    --Peace

  8. #8
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    I'd worry about bearing and/or hubshell life since the bearings would be further inboard compared to a true 197mm hub. Unless you're going with some high-end wheel (just the rear, right?), the time and materials to come up with a (compromised) fix won't be worth it.

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