I've completely removed the original U-brake bosses, modified the magura mounts significantly, customised some bolts and washers so that the magura mounts are sandwiched between as much material as possible. The U-brake bosses are much further from the rim than canti bosses.
Whilst...
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Not feeling the retro love? It was a bit of an odd decision not to have a replaceable dropout on their flagship model, even more so that it was always going to be very hard to repair. I still say that frame will live again!
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? The frame just needs to have the upper section of the seat tube clear, top routed is ok, top pull front mech routing is the problem. I was getting pretty keen on the specialized but narrow rear spacing won't suit any wheels I've got.