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http://www.edinburghbicycle.com/products/dmr-chain-tug-mech-hanger?gclid=CMiop9uyqrkCFfIPtAod0BcAGw
If you search for "track end derailleur hanger" (rather than horizontal dropout) you'll find plenty more, this is just one example.
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Are there any off the peg solutions turning a horizontal dropout to one with a derailleur hangar that isn't wafer thin
Even if there were, you'd still have the problem of trying to find a decent 120mm hub to take a multiple freewheel, and a decent multiple freewheel to screw onto it. It would be much easier to sell the Langster and buy a road bike.
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3 speed wheelset is your friends.
Like this
Toying with the idea of turning an old 2007-08 Specialized Langster into a light tourer.
Are there any off the peg solutions turning a horizontal dropout to one with a derailleur hangar that isn't wafer thin.
And is it possible to fit a Surly Front rack on a bike with a thicker carbon fork that also has a caliper brake?