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  1. #1
    discombobulated SuperModerator
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    odd mtb disc rotor

    Wonder if my poor description will work...
    uy at work has a bike, and through the broken english it sounded like peugeot. It has 'springs' on both ends .
    And it has disc brakes. He brought a rotor in today, worn out. WIERD rotor. Mounting holes appeared near the outside diameter of the rotor, braking surface was definitely the INNER third of the rotor. Then there were cutouts in the inside diamerer of the rotor, kind v-shaped pointing towards the outside diameter. It was chrome plated steel too.

    Does this sound familiar to anyone? Is it some kind of real old disc brake?
    I will have my camera phone tomorrow if he still has the rotor at work.
    CDT

  2. #2
    Dirt Deviant
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    Sounds like some kind of drum brake.
    Look, whatever happens, don't fight the mountain.

  3. #3
    ride hard take risks
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  4. #4
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    If that was it, those were like Audi's "UFO" rotors, or their internally vented rotors. If that was the case, you don't see too much of it because a license would have to have been obtained from them for use. It was practical on cars for the early 90's because Audi preferred using 15" wheels and tires for a better ride (and even on the performance cars 16 and they returned staggeringly high skidpad numbers despite them), so they needed a way to increase braking rotor size in that small wheel, so they moved the caliper to near the hub and the disc went to near the wheel. Stupid expensive project for just avoiding use of 16 and 17" wheels. I would think bikes have no such trouble

  5. #5
    discombobulated SuperModerator
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    Sorry to stir the pot, I will really try to get a pic. They dont look like that link. They are like normal diameter, and seem thinner than my avid rotors. They have vitually No holes in them save for the couple outboard mounting holes and the notches on the ID. Never seen a bike rotor like them.
    Failing a pic I will make a sketch and post That
    CDT

  6. #6
    I Tried Them ALL... Moderator
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    Hygia Italy may be close to what you are describing. They were one of the first disc brakes, for MTBs. I think they even supplied the old-school Cannondale Moto DH bikes, with a drive-side rotor arrangement. A pic or decent sketch would certainly help....
    "The mind will quit....well before the body does"

  7. #7
    discombobulated SuperModerator
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    Ok sorry for the quality. He says it is only 2 years old and a very expensive bike
    I dont think there are holes in near the outer edge now, I scribbled them out...
    He said there were four semi circular notches on the ID and 3 larger V notches...
    CDT
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  8. #8
    I Tried Them ALL... Moderator
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    Not vented? That's what I call a heating pad! I hope you are NOT interested in buying this "expensive" piece of metal disc. I have no clue who makes this. It appears to be home-spun/fabricated....hence why it could be expensive...to manufacturer(sic). Stick with PROVEN technology! Now is not the time to be a guinea pig.....money is way too tight!
    "The mind will quit....well before the body does"

  9. #9
    ride hard take risks
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    I rode a buds team issue Cannondale DH bike about 10 years ago and he gave me 3 boxes of spares, the bike had Sachs brakes and I believe some of the rotors looked like the drawing. Possibly a custom made or prototype one off??
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  10. #10
    discombobulated SuperModerator
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    They looked cheasy but I am only used to current avid stuff. I can also say he has zero actual bike knowledge. He bought a Trek TT bike 'because the colors matched my car and it was like 40% off". He also is not happy with the way the TT handles and wants to 'tighten the bearings' so the steering isnt so .... "twitchy"

    CDT

  11. #11
    ride hard take risks
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    Here ya go Tony a custom vintage 125 GP rotor I have had since the 80's.
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  12. #12
    The plough
    Reputation: vmajor's Avatar
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    Quote Originally Posted by Zachariah
    Hygia Italy may be close to what you are describing. They were one of the first disc brakes, for MTBs. I think they even supplied the old-school Cannondale Moto DH bikes, with a drive-side rotor arrangement. A pic or decent sketch would certainly help....
    Hygia Italy? Hmm, I think you may be thinking of Grimeca.

    Hygia is a Taiwanese brand that is well known to me.

    Grimeca still makes aftermarket stuff for other uses, just not bikes anymore AFAIK.

    Here are some of the rotors that resemble the sketch:

    http://www.grimeca.it/it/?id=25
    http://www.grimeca.it/it/?id=27

    V.

  13. #13
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    Still not yet. THe bolt holes have to be along the outside.

  14. #14
    The plough
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    Quote Originally Posted by Jerk_Chicken
    Still not yet. THe bolt holes have to be along the outside.
    Eh?

    Quote Originally Posted by CdaleTony
    I dont think there are holes in near the outer edge now, I scribbled them out...
    ...or are there some other holes?

    V.

  15. #15
    ride hard take risks
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    Quote Originally Posted by vmajor
    Eh?



    ...or are there some other holes?

    V.
    I agree with JC and will add sweet advertising.
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  16. #16
    I Tried Them ALL... Moderator
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    Quote Originally Posted by vmajor
    Hygia Italy? Hmm, I think you may be thinking of Grimeca.

    Hygia is a Taiwanese brand that is well known to me.

    Grimeca still makes aftermarket stuff for other uses, just not bikes anymore AFAIK.

    Here are some of the rotors that resemble the sketch:

    http://www.grimeca.it/it/?id=25
    http://www.grimeca.it/it/?id=27

    V.
    thanx for the correction........I MEANT GRIMECA ITALY!
    "The mind will quit....well before the body does"

  17. #17
    discombobulated SuperModerator
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    Quote Originally Posted by vmajor
    Hygia Italy? Hmm, I think you may be thinking of Grimeca.

    Hygia is a Taiwanese brand that is well known to me.

    Grimeca still makes aftermarket stuff for other uses, just not bikes anymore AFAIK.

    Here are some of the rotors that resemble the sketch:

    http://www.grimeca.it/it/?id=25
    http://www.grimeca.it/it/?id=27

    V.
    Wierd that I cant find a pic of it. I dont think ther are holes near the outer edge, he said there werent after I did the sketch. Gonna try tp get my hands on it.
    CDT

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