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Join Date: Dec 2012
Location: South Austin, Texas
Posts: 919
Bikes: 2010 Origin8 CX700, 2003 Cannondale Backroads Cross Country, 1997 Trek mtn steel frame converted commuter/tourer, 1983 Univega Sportour, 2010 Surly LHT, Others...
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Just completed C&O and GAP these past few days.
I would recommend a bit of tread on the C&O as things can get quite muddy.
I would highly recommend Continental Travel Contacts.
Schwalbe Big Bens or Marathon Supremes would work wonderfully as well.
All of them will feel considerably springier than the regular marathons or marathon plus.
Also, would prefer 32's or wider on the GAP and 37's or wider on the C&O.
I ran 700X37 Conti Travel Contacts which were nearly ideal for all conditions encountered.
Best.