Originally Posted by
TejanoTrackie
To follow up on what
mrv said:
1) Disc brakes don’t work with track dropouts, because the wheel can only be in one position relative to the caliper which is mounted on the chainstay. With rim brakes, the brake pads are moved up or down to align with the rim as the wheel position is adjusted in the dropout to achieve the proper chain tension.
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My Surly Pugsley has track ends and disk brakes.