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Disc Brake Adapter

Discussion in 'The Shop' started by kingbee, Apr 14, 2008.

  1. kingbee

    kingbee Monkey

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    I am putting some Avid cable disc brakes on my wifes Trek hard tail. I used to have these brakes on my park bike, so they already had the adapter on it.

    Then I ran into a problem I have never had before. The rear adapter holes are at a different spacing. The frame holes are at 1.75" (44mm or 45mm?). My adapter is for 2" (51mm).

    I haven't found an adapter yet for this size. Can someone point me in the right direction?
     

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  2. recycle127

    recycle127 Chimp

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    what year is the frame?
     
  3. sanjuro

    sanjuro Tube Smuggler

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    I wonder if they are 22mm Hayes mounts...
     
  4. kingbee

    kingbee Monkey

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    The frame is either a 2004 or 2005.

    Heres some pictures. Im starting to even wonder if they are disc mounts. But I dont know what else they would be. Its only on the disc side.


     
  5. Quo Fan

    Quo Fan don't make me kick your ass

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    Those sure don't look like disc brake adapters to me. Look more like fender mounts.
     
  6. kingbee

    kingbee Monkey

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    Arent those usually on both sides though? They dont look like disc brake mounts to me any more either. Now Im just not sure what they are.:hmm:
     
  7. r464

    r464 Turbo Monkey

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    That would be it.

    Are there two mounts on the drive side as well?
     
  8. kingbee

    kingbee Monkey

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    No, just the disc side.
     
  9. moff_quigley

    moff_quigley Why don't you have a seat over there?

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    That dropout probably came from the "parts bin" and is intended for rack/fender mounting. You might be able to get a custom adapter made but I'd be nervous about using it since that dropout isn't really designed for discs.
     
  10. kingbee

    kingbee Monkey

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    I was thinking the same thing. I could get an adapter made for it. But I wonder if the drop-out could handle it.
     
  11. sanjuro

    sanjuro Tube Smuggler

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    Naah. I have seen a lot of early disc mount designs break chainstays.

    I would consider getting a new frame anyway. If the dropout had a lot of fender mounts, I doubt it is a sub 3lb race frame. You could buy a modern mountain frame for about $200-300.
     
  12. kingbee

    kingbee Monkey

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    Well I found out Trek makes a special bracket. I have my LBS tracking one down.

     
  13. moff_quigley

    moff_quigley Why don't you have a seat over there?

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    Whoa. Interesting.
     
  14. kingbee

    kingbee Monkey

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    Just ordered one for $15 through the LBS.
     
  15. sanjuro

    sanjuro Tube Smuggler

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    stunning
     
  16. Quo Fan

    Quo Fan don't make me kick your ass

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    Yeah, I remember seeing that. Pretty neat idea, if the bike isn't using discs, then the adapter can be removed, saving weight (for all you weight weenies).