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  1. #1
    Crash, get up, ride...
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    203mm post mount install

    (Taken from Mechanics section)

    I know this may be a very noob thing to ask, but I cant seem to figure this out. Im installing a 203mm rotor for the front braking system. Im using Avid BB7s.

    I have this adapter:http://www.pricepoint.com/detail/167...-Included).htm (the lower right one.)

    There are 4 holes. 2 are threaded and 2 are not. I haven't installed 203mm adapters before, and the others (ie. 160mm and 185mm) have only 2 holes, which bolt right on the the fork. Ive tried different combinations, but haven't figured out where to put the bolts. Either way, the mount seems to be too small. Its spacing is about the same size as an Avid 185mm adapter.

    I followed this picture. It seems I would need more CPS spacers for the top bolt. There is an empty space. Its not straight forward like the other adapters. Anyone have this problem or recognize this inconsistency? Can someone lead me in the right direction, or post a photo with your setups on the adapter and caliper? Thanks.


  2. #2
    Gravity hunter dminor's Avatar
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    Your link was truncated.

    http://www.pricepoint.com/detail/167...-Included).htm

    That should be the right one. The threadless holes are what you use to bolt the adapter to the threaded for post holes. SRAM's picture is off in that illustration I think. Oh, and do the CPS spacers just like their diagram and you should be fine.

    The threaded hole that extends out on its own beyond the no-thread hole (left in the pic) should be UP when mounted on the fork. This offset raises the caliper farther from the axle-center to meet the203mm disc surface properly.

    This is the Hayes adapter but it's the same setup:



    Edit - - Here's the Avid 203 adapter:

    Last edited by dminor; 07-30-09 at 11:19 AM.

  3. #3
    Crash, get up, ride...
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    Dude, thanks a lot! So. I needed 4 bolts. Got it up and running! Thanks again for the description.

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