I've owned my 2009 GT Marathon 9r for a couple of years now and have to say it is one of the most under-rated 29er's out there. The only upgrade was to put a set of Mavic C29 rims, MAxxis Ardent front and Crossmark rear and set them up tubeless.
Anyone else out there have one?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: GT Marathon 9r