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  1. #1
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    Problem mounting Hayes 9's HD

    Hi all,

    After many years of riding XC I recently decided to buy myself a play bike and (not wanting to spend a couple of grand on a ready made bike) bought myself a 2000 Foes DHS Mono frame and a pair of Monster T's from Ebay and built the rest up using new parts.
    The problem I'm having is in mounting the Nines rear brake caliper (74-23), Frame, fork and calipers are all IS mount but when trying to fit the rear caliper itself to the frame I find that it is out of position (laterally) by approx 8-10mm. I'm buggered if I can figure out what I'm doing wrong....
    The wheels that the rotors (8") are mounted to are Halo Combat SAS with the Spin Doctor 20mm front Hub.

    Finding a wider 8" mount for the rear is proving to be impossible, even the Hayes website doesn't list an alternative to the stock 74-23 IS mount that came with the brake.
    The 74-25 20mm bolt through front bracket would seem to be the right width to bodge onto the rear, but would it work?

    After spending several hours trawling through countless MTB websites I'm at my wits end.....

    I must note that the frame is a PRE floating brake model.

    Cheers, Rob.

  2. #2
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    Youre not mounting the 74-23 backwards are you?
    They are meant to be facing in a specific direction which is marked on the bracket.

    I just installed the same brakes to my bike yesterday with no problems at all.

  3. #3
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    Its attached to the caliper the right way.

    The problem I'm having is that the mount needs to be wider in order for the caliper to bolt to the frame.
    Even with the bracket bolts loosened to allow maximum float, theres still a 6-8mm 'gap'
    lemme see if I can get a pic to show you....

  4. #4
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    Ah OK, I get what you mean now.
    Yeah, maybe a pic would be good...someone may pick up something obvious

  5. #5
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    Sorry about the quality of the images but its night time here in the UK and the garage lighting isn't up to much....




  6. #6
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    BTW, the caliper is just sitting on the rotor to emphasize the gap

  7. #7
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    Thats a curly one
    Couple fo things that came to mind quickly...
    - wheel/axle mounted correctly?
    - disc rotor warped?

    Other than that, I cant think of anything else.
    How did your last set of brakes fit?

  8. #8
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    The wheels mounted right and fits perfectly between the dropouts (135mm)
    Rotors new and straight.
    I'm wondering whether there's 'too much' spacing at the disc end of the hub but thats just clutching at straws....

    Last set of brakes I had on there were a set of Hopes (can't remember themodel) but the bikes a 2000 Foes DHS Mono which hasn't been a full bike for a couple of years.

    This is how it used to look...


  9. #9
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    It must be something to do with hub to frame spacing...Do you have any problems with the casette?
    IDK man, sorry i couldnt be of more help

  10. #10
    No Fear
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    Use spacers

  11. #11
    SLX
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    Quote Originally Posted by Icantthinkofaname


    Wierd??? The only thing I can think of is a "boxxer" fork adaptor and I already gave mine away. Either that or your hub is different.

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