3rd Grade Dropout
Join Date: Oct 2005
Location: Santa Barbara Calif.
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There is more to it than meets the eye.
The chainstay/dropout is "higher" (vertical distance) on a horizontal dropout vs. the track dropout.
If you just chop the old bit off, slot the seatstay/chainstay ends and insert the track dropout, you will lower the BB and create a sloping (rearward) toptube, and this will effect the geometry.
You will have to do some cold bending on the chainstays (downward) to get the correct lineup (rear axle/BB/front axle). You could always make your own track dropout with a lower adjustment slot, and tailor it specifically to the old frame.