What are these holes?

Discussion in 'Mountain Bikes' started by RetFor, Jun 24, 2019.

  1. RetFor

    RetFor New Member

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    Hi. I picked up a used older trek 3500 to convert to an ebike. I thought it had holes to mount disc brakes in the back, but when I went to put on the adapter, I found that it didn't fit. The holes are only 45 mm apart instead of the is standard 51 mm. Are these an older version before it was standardized to 51 mm? Something else? If they are an older version of disc mounts, anyone know where i can get the proper adapter? My searches haven't turned up anything.

    The front fork does have 51 mm holes, although I'm not sure if it is the original fork or not.

    Thanks.
     

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  2. dabac

    dabac Well-Known Member

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  3. RetFor

    RetFor New Member

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    interesting, thanks. that looks like it could maybe work, but id want to know the dimensions and spacing to make sure it would work before ordering.

    in the end, though, i decided to sell this bike since it was a bit small for me anyway. i picked up a trek wahoo 29er instead that already has disc brakes, although i upgraded the rear one a bit as i had anyway gotten a caliper for the other bike.

    so now ive got a 1200w 69er. got a few more things to do to it to finish it off, but its working great so far...
     
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