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  1. #1
    MTB Owner
    Reputation: C-Rock's Avatar
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    Conversion to rear disc brake??

    What's the best way to convert to a disc brake for a frame that has no caliper bosses??
    Please suggest something good.
    Last edited by C-Rock; 09-11-2010 at 07:48 PM.

  2. #2
    rebmem rbtm
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    http://2btherapy.com/index.php/bikes/brake-therapy-conversion-kit

    http://www.woodmancomponents.com/catalog/categorie.php?cat=dis&lang=en

    a cheaper version of those two: http://cgi.ebay.com/New-Bike-Rear-Disc-Brake-Adapter-Kit-170mm-Black

    Probably the most common one is the 'a2z universal disc mount adapter' or 'a2z uni' which is much cheaper but won't work on all frames, it looks like a2z doesn't make it anymore either as it's not listed on their website, some shops still sell them though.
    a2z uni photos

    Adapter specific for old Trek, Fisher & Klein bikes: http://cgi.ebay.com/Rear-disc-brake-adapter-4-Gary-Fisher-Trek-Klein
    Last edited by cobba; 09-11-2010 at 08:37 PM.

  3. #3
    MTB Owner
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    Thanks cobba.
    I'm looking at the "Therapy" system.
    Don't want anything that requires a special hub.
    I've got an CK-ISO hub that I won't give up for anything.
    Will pay the price for a good conversion that offers quality and compatability.
    I'd also like to avoid drilling holes in my frame. (though that might be a tall order)

  4. #4
    one less car
    Reputation: B@dKarma's Avatar
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    this thread: A2Z Disk Brake Adapter for frames without disk mount, anyone try one? has what you might find suitable, A2Z disc brake adaptor, tho it maybe hard to actually get one, and linx for it no longer work. still, it may be worth a try. pix in there too. I managed to snag one last year for my '00 TREK 4500 and it works really well. thing is the dropout must be flat.
    nothing in life is real, so if anything goes wrong, blame the dead guy

  5. #5
    MTB Owner
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    Thanks BK for the link.
    Good reading...even if my dropouts aren't flat.(though one guy in that thread made it work)
    I've got to do this one way or another or it's over for this particular frame.

  6. #6
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    I think your best bet is to just get a new frame. Is your current frame something super-trick that you don't want to part with? Performance has some dirt-cheap frames that are quite good.

  7. #7
    MTB Owner
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    Quote Originally Posted by RustyIron
    I think your best bet is to just get a new frame. Is your current frame something super-trick that you don't want to part with? Performance has some dirt-cheap frames that are quite good.
    Ya. Unfortunately the frame is a classic...and IMHO very trick.
    It's an early '92 Foes Weasel.
    There's so much I love about the frame. I want to ride it till it's broken.
    Last edited by C-Rock; 09-12-2010 at 07:24 AM.

  8. #8
    ballbuster
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    Is your frame....

    Quote Originally Posted by C-Rock
    What's the best way to convert to a disc brake for a frame that has no caliper bosses??
    Please suggest something good.
    ... especially.... I dunno... special?

    You can get a hardtail frame pretty cheaply these days. The Performance Bike Access frame goes for $99 when on sale, and its a great hardtail frame. I got one used off craigslist for $70 a few years ago, and rode the crud out of that thing. Great bike.

    *edit*

    Oh, NM.... just saw your last post.

  9. #9
    Rub it............
    Reputation: frdfandc's Avatar
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    Quote Originally Posted by C-Rock
    I want to ride it till it's broken.

    You might get your wish modifying it this way.

  10. #10
    I Tried Them ALL... Moderator
    Reputation: Zachariah's Avatar
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    I agree, keep the frame forever...just don't ride it converted.

    Now, your options are WIDE-OPEN!
    "The mind will quit....well before the body does"

  11. #11
    MTB Owner
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    Quote Originally Posted by frdfandc
    You might get your wish modifying it this way.
    Quote Originally Posted by Zachariah
    I agree, keep the frame forever...just don't ride it converted.
    Now, your options are WIDE-OPEN!
    Too funny guys!

    Seriously though, does that mod stress the frame more or something?
    My choice is to ride til the rim wears through (certainly bad).
    Or do the disc mod.
    Hasn't anyone had a good experience with disc mods?

  12. #12
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    Quote Originally Posted by C-Rock
    Too funny guys!

    Seriously though, does that mod stress the frame more or something?
    My choice is to ride til the rim wears through (certainly bad).
    Or do the disc mod.
    Hasn't anyone had a good experience with disc mods?
    Disc brakes do not stress frames at all. Not one bit.

    You can replace rim brake rims, you know.

    Yes, people have experience with disc brake mods, of course, as you expect us to. Don't you have experience too?

    Quote Originally Posted by C-Rock
    What's the best way to convert to a disc brake for a frame that has no caliper bosses??
    Please suggest something good.
    Epoxy and a block of wood.

  13. #13
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    Brake therapy kit would do it, no problem, but first just admit that your V brakes work great, you just feel self conscious that you don't fit in with the other kids.

    Admit it!

  14. #14
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    Quote Originally Posted by junktrunk
    You can replace rim brake rims, you know.
    For a lot less money than new disc brakes, disc compatible wheel, and brake therapy kit.

  15. #15
    MTB Owner
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    Quote Originally Posted by junktrunk
    You can replace rim brake rims, you know.
    Yep. That's the conclusion I have come to as well...and better off.
    Keeping it the way it is.

  16. #16
    MTB Owner
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    Quote Originally Posted by smilinsteve
    Brake therapy kit would do it, no problem, but first just admit that your V brakes work great, you just feel self conscious that you don't fit in with the other kids.
    Admit it!
    Ha!
    I've got Magura hydro-rimbrakes.
    They work even better than the V's.

    Thanks for the replies and opinions.
    I'm done with this and happy about leaving it "as is".

  17. #17
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    Quote Originally Posted by C-Rock
    Ha!
    I've got Magura hydro-rimbrakes.
    They work even better than the V's.

    Thanks for the replies and opinions.
    I'm done with this and happy about leaving it "as is".
    Cool. Good decision.

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