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  1. #1
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    New question here. Rear disc brake adapter help?

    Hi,

    I have a Schwinn mtn bike with rear bolt holes for a rear basket rack....

    I went through tons of different websites looking at rear disc brake adapters but none of them give any dimensions where i can confirm the correct adapter.

    im not up to par on all the ISO, 51mm, etc, etc terminology that's used out there.

    thanks in advance for any help...

    the holes measure about 26,5mm apart - center to center.

    heres a pic:

    -J

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  3. #3
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    Is there anything else out there?

    I was particularly looking for something that mounts directly to those two holes? i figured it was one of these styles out there that works?



    -J

  4. #4
    mtbr member
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    Schwinn never intended for that frame to be disc compatible, so I'd be surprised if there's an adapter that going to fit the rack holes.

    a2z or run it mullet style, as cobba suggested.
    [SIZE=1][/SIZE]

  5. #5
    Nouveau Retrogrouch SuperModerator
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    Quote Originally Posted by Jasontamu View Post
    Hi,

    I have a Schwinn mtn bike with rear bolt holes for a rear basket rack....

    I went through tons of different websites looking at rear disc brake adapters but none of them give any dimensions where i can confirm the correct adapter.

    im not up to par on all the ISO, 51mm, etc, etc terminology that's used out there.

    thanks in advance for any help...

    the holes measure about 26,5mm apart - center to center.

    heres a pic:

    -J
    Those are rack/fender eyelets, not disc brake mounts. No adaptors bolts straight on. Generally not worth converting to to discs, especially since you also need new wheels.
    mtbtires.com
    The trouble with common sense is it is no longer common

  6. #6
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    ya im aware of that...rack/fender mounts...

    I have a spare set of disc wheels, so that's not an issue. i have spare calipers and all so im left down to just the rear adaptation issue.

    Those two holes however seem like prime real estate to have a mount fab'd up....I guess from all the sites i came across and all the different types i saw i would find one that would work it just threw me off that none of the sites had dimensions or application charts, etc...

    Reason - this is the wifes bike, she loves it, doesnt want new, but said she wants disc..being the mod man that i am, i accept the challenge, so im gonna work it just cause...fun stuff why not.

    fronts taken care of already, i found i only needed for the front the fork mount iso adapter style, and i have a few of those from multiple disc brake calipers i have purchased in the past.

    so, its about garage time and having fun....
    -J

  7. #7
    Big Paws on a Puppy!!
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    While I agree with what the others have said in terms of it not being worth it to try and convert a non-disc brake frame to accept a disc brake in the rear, I've used the A2Z adapter that Cobba referenced in the above post in the past with some success. IMHO you really need your frame to be a "perfect storm" for the A2Z to work without some tweaking. I've also seen posts where guys have fab'd up their own adapter based on the A2Z design.

    There is another thread or two floating around on these boards on the same basic topic. I posted a picture of my setup in one of those threads. Do a search for "A2Z" and maybe you'll get lucky.
    ‎"My bicycle masters boardwalk and quagmire with aplomb." - Tom Nuttall

  8. #8
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    ^ thanks yes, im looking around, comparing and coming up with ideas..

    -J

  9. #9
    rebmem rbtm
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    $175 - http://2btherapy.com/bikes/brake-therapy-conversion-kit
    A cheaper version of that: http://www.ebay.com/itm/New-MTB-Bicycle-Bike-Rear-Disc-Brake-Adapter-Kit-145mm-Red-/360476005650

    The following adapter could possibly work.
    With it you might be able to use one of your existing holes but you'd have to drill another hole in the dropout to get the correct placement, you might even have to drill two new holes to get it to work.
    http://www.ebay.com/itm/Retro-GT-Zaskar-Rear-Disc-Brake-Mount-Adapter-Disk-LE-/150919540518

    There's a couple of home made adapters on the following thread.
    http://forums.mtbr.com/singlespeed/rear-disk-brake-adapter-314985.html

    but said she wants disc
    Tell her she has a 26" disc rotor on the bike now that the tire is attached to.

    Mullet style:

    Last edited by cobba; 11-06-2012 at 07:45 AM.

  10. #10
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    ya, im familiar with "mullet style".....bleh, i didnt know there was that name for it till just recently....

    I have been running mullet style on my old school Litespeed mtn bike for some time now. I really think the front disc, rear V is a sweet combination....

    I do like the GT zaskar type mount you linked....im attaching it for future reference.....that style is more what im after - however utilizing the current mount holes i have.....

    Look like I will be running the bike over to machine shop for a custom part fab. (im in aerospace industry)

    -J
    Attached Thumbnails Attached Thumbnails Rear disc brake adapter help?-disc-brake-adapter.jpg  


  11. #11
    rebmem rbtm
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    The following might come in handy if you're going to make your own converter.

    http://www.hayesdiscbrake.com/wp-content/uploads/2010/04/96-22101_5inch.pdf

    http://www.magura.com/uploads/media/downloads/IS_E_44cb8a_01.pdf * front = rear & rear = front

  12. #12
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    ^ thank you..

  13. #13
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    Do you have pictures of your adapter? Which route did you end up going?

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