San Andreas - Rear disc brake mount adapter problem

(29 posts)
  1. Da Frenchie

    Da Frenchie
    Member

    Hi guys,

    Here's my dilemma. I've purchased a San Andreas frame from a friend of mine and he gave me a rear disc brake adapter with the frame. I recently installed it on the frame but to my great disappointment, I can't fit a set of Hayes HFX-9 with an 8" rotor on it.

    I've tried to use a Hayes caliper adapter (74-23) on it but I can only use the bottom bolt to hold it onto the brake adapter. (see the pic)
    I would have to grind down the top of the Hayes adapter to bolt on the second bolt but if I do so, the caliper will rest on top of the rotor and the wheel won't spin freely.

    Any idea or suggestion would greatly be appreciated.

    Thanks

    Jean

    "Get a life, get a bike!"

    Attachments

    1. 002a_-_clearance.jpg (99.7 KB, 2 downloads) 5 years old
    2. 001_-_Adapter_upside_down2.jpg (530.9 KB, 0 downloads) 5 years old
    Posted 5 years ago # | | | | |
  2. Da Frenchie

    Da Frenchie
    Member

    Hey G,

    I have switched from an 8" rotor to a 6" rotor and still running into a snag. Even with a 6" rotor on, the two bolts holding the caliper onto the brake adapter are not event tight yet that I have no clearance left between the caliper and the top of the rotor.

    Da Frenchie

    "Get a life, get a bike!"

    Attachments

    1. top_view_-_clearance_with_6in_rotor.JPG (113.9 KB, 0 downloads) 5 years old
    2. with_a_6in_rotor.JPG (154.2 KB, 1 downloads) 5 years old
    Posted 5 years ago # | | | | |
  3. User has not uploaded an avatar

    Anonymous

    Hey Jean,

    Looking at that, all I can say is that the set up is incompatible with the tabs. Looking at it, the caliper is already spaced too far out for my liking you already have two adapters which to me is a big no-no.

    While it's great that you got the unit for nix, I think you might have to invest in something that might work better. I have run Hopes on both my San An Classics with an adapter without any issues....

    Posted 5 years ago # | | | | |
  4. Da Frenchie

    Da Frenchie
    Member

    Hey G - MC Design Guy,

    Which adapter did you use? One from Mountain Cycle or one from Hope?
    I'm asking because I might have the same dilemma. The one thing that seems to play against me if the older brake tabs on the swing arm. I just need something to install some hydraulic disc brake set so I can get the bike out of my house. Any input is more than welcome.

    Thanks for the tip though.

    Jean

    Posted 5 years ago # | | | | |
  5. Ericmopar

    Ericmopar
    Member

    I wish I could see that in person.
    It looks like the spacers from a Avid brakes set, or vee brakes, could be used as spacers to me. That would give you some extra adjustment as well, just like Avid disc setups.
    It would take some longer mounting bolts.
    If you were here in the S.Nevada area, I'd say stop by and let me take a look. I have tons of those spacer / washers around.
    I save them for just such an occasion.

    Posted 5 years ago # | | | | |
  6. User has not uploaded an avatar

    Anonymous

    Hey Da Frenchie,

    I used the standard +20 IS adapter from Hope. Seems to work just fine on the frames I have put it on.

    Eric, just as a heads up, most brake manufacturers advise against too many spacer etc. as increasing the leverage on a mount, the bolts and the frame is a bad idea and can lead to some pretty gnarly things happening.

    The set up pictured here is scary enough, so the best solution is to ditch the adapters and find something (adapter or otherwise) that minimises the extra leverage.

    Posted 5 years ago # | | | | |
  7. Da Frenchie

    Da Frenchie
    Member

    Can anyone from the MC company identify the year of the frame I have in here with the serial number?

    If not, I would like to know what kind of disc brake (make and model) was the frame pictured above made for?

    Any chance of finding anything newer on the market to fit this older frame?

    Thx

    Da Frenchie

    Posted 4 years ago # | | | | |
  8. User has not uploaded an avatar

    Anonymous

    Hmmm....

    Just checked the ones here and it's def a pre 2003, as the mount spacing there is narrower than IS. John might have a record, so I'll ping him on this.

    If you can show me a pic of the whole frame, I'll have a better idea.

    Posted 4 years ago # | | | | |
  9. User has not uploaded an avatar

    Anonymous

    Hi guys, As we all know with the pre 2003 San Andreas the MC Pro Stop Brake Adapter is necessary to mount any modern disc brake system. In addition the brake manufacture may also have a spacer / adapter that is required to fit "their" rotors and specific rotor sizes. So in most cases on pre 2003 San Andreas will have 2 adapters on them (the MC pro stop to IS conversion and the brake manufactures part).

    I have a couple questions...
    1) are the brake rotors used Hayes or another manufacture ?
    2) what caliper is the one in the picture ?

    PS there are NO RECORDS of old MC Frames via part #. We can help identify the year by the stickers or some small manufacturing changes throughout the years.

    Posted 4 years ago # | | | | |
  10. Da Frenchie

    Da Frenchie
    Member

    Well, I finally solved this never ending brake adapter problem for this Mountain Cycle San Andreas piece of crap bike: I threw the whole bike in a dumpster! No more headache with this shitty designed bike.

    My problems are gone. And no more Mountain Cycle bikes for me either... ever !!

    God what a relief that is.

    Can you see my happy dance now??!

    Posted 4 years ago # | | | | |
  11. User has not uploaded an avatar

    Anonymous

    Da Frenchie,

    You were given just and suitable advice in regards to your issue. It is clear you were trying to fit hardware that was inappropriate for the application and wanted to do this only because you received it for free.

    Your attitude is unfortunate.

    For others out there, the frame in question was clearly pre 2003, probably 2000 or so judging by the pictures. Fitting recent equipment, especially post mount brakes will can be problematic, so it's best to make sure you get full advice from Mountain Cycle before buying or trying to install new parts.

    Posted 4 years ago # | | | | |
  12. Mikey58

    Mikey58
    Member

    Well I had no problem fitting disc brakes on my San An of 1994 vintage.I had the MC disc adaptor for the swingarm and the DiaTech caliper fitted fine,so it can be done easily.

    Posted 4 years ago # | | | | |
  13. chrisdurand

    chrisdurand
    Member

    funny that i came across this, but i was looking to add some Avid bb7's to the rear of my pre-2003 San Andreas........would this require an adapter??...i have some of the extra spacer plates form the front disc that i think i will try to see if the mounting holes line up....but it would be great to hear from one of the MC guys on this.....

    thanks,
    Chris Durand.....

    Posted 4 years ago # | | | | |
  14. cHoc

    cHoc
    Member

    Chris, aside from the adapter you need, please also do not forget these extra's with mounting the bolts als Da Frenchie clearly did. If he did so, he would see that his brakes would fit his San Andreas.

    And you will need an adapter with yours, do you already have an IS2000 rearmount?
    Then you would just need an IS to Post adapter in the size of the disc you want to use, 6", 7" or 8"

    Attachments

    1. disc_large.jpg (23.9 KB, 1 downloads) 4 years old
    2. 30164.jpg (44.7 KB, 1 downloads) 4 years old
    Posted 4 years ago # | | | | |
  15. chrisdurand

    chrisdurand
    Member

    thanks a bunch for the speedy reply ......is the is2000 adapter the one peice that i need to get from MC......and is the IS to post adapter something that is included in the avid kit........sorry but i am not up to date on the proper labeling of the parts...

    if i get the " is-adapter " would i be able to mount the rear bb7 caliper kit to the rear of my San Andreas....? if yes then thanks and no need for an explanation.....but are the adapters still availible, i seen a discontinued list on the site here and that makes me a we nervous that i cant have a disc on the rear......i should have converted long ago......

    thanks again,
    chris durand.......

    Posted 4 years ago # | | | | |
  16. cHoc

    cHoc
    Member

    Well, is your disc tab the same as on the pictures from Da Frenchie? Ignore the 2 adapters that are also there for the moment.

    If YES, you need a special adapter from that dics tab to Postmount, or maybe 2 adapters as Da Frenchie had. I don't really know if that is an good way of mounting, 2 adapters...., If they are somewhere for sale, I don't know. Maybe MC has/will make them??

    If NO, then you have IS2000, you just need an IS2000 to Postmount adapter, available at many shops, if they are included with the brakes, maybe, I don't know.

    Posted 4 years ago # | | | | |
  17. chrisdurand

    chrisdurand
    Member

    Well, is your disc tab the same as on the pictures from Da Frenchie? Ignore the 2 adapters that are also there for the moment.
    If YES, you need a special adapter from that dics tab to Postmount, or maybe 2 adapters as Da Frenchie had. I don't really know if that is an good way of mounting, 2 adapters...., If they are somewhere for sale, I don't know. Maybe MC has/will make them??
    If NO, then you have IS2000, you just need an IS2000 to Postmount adapter, available at many shops, if they are included with the brakes, maybe, I don't know.

    thanks i will give it a look in the morning and post back what i have.....maybe a pic if i can get one....thinking i have the one in the photo...but up until now i never really payed attention to the bolt pattern....i just knew the frame from the early days had the mtn cycle set-up for disc...i have a early MTN BIKE ACTION, with the San Andreas from "90" or "91"...think i bought my frame in 2001....

    thanks for the info.....will post my findings later

    the up-periscope of the mount looks to be the early one so it looks as though i need the adapter plate....hope not...to cold out to go and check it in the garage....will look tomarrow

    Posted 4 years ago # | | | | |
  18. Ericmopar

    Ericmopar
    Member

    It's a bit late now I suppose, but I wonder if Da Frenchie, had an International Standard fork mount adapter, mounted on the rear by mistake.

    Also, to call the bike terrible names, because of a slight problem in mounting a set of brakes, is a bit unfair.
    When those older San Ans came out, they were the only bikes that had disk brakes for a long time, so there was no international standard yet.

    Posted 4 years ago # | | | | |
  19. Ericmopar

    Ericmopar
    Member

    Chris, aside from the adapter you need, please also do not forget these extra's with mounting the bolts als Da Frenchie clearly did. If he did so, he would see that his brakes would fit his San Andreas.
    And you will need an adapter with yours, do you already have an IS2000 rearmount?
    Then you would just need an IS to Post adapter in the size of the disc you want to use, 6", 7" or 8"

    When I said "spacers" that's what I had been referring to.
    Although Da Frenchies has Hayes brakes, and they are supposed to mount directly to the adapter's, or a post mount fork's, posts.

    Posted 4 years ago # | | | | |
  20. saltyman

    saltyman
    Member

    where can i buy an adaptor so i can fit discs onto my san andreas?

    i think it is a 1999 model.

    id like to know what adaptor i need, what size discs, what mount to buy and what caliper to buy thanks.

    96 san andreas
    94 san andreas
    Posted 4 years ago # | | | | |

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