Yup, one of these: http://www.evanscycles.com/products/trek/elite-86-2014-mountain-bike-ec042077
That'll be why, Shimano freehubs tend to have a very tiny amount of play, this is normal.
Hmm that's kinda reassuring... I'm going to take it apart to check and probably buy a back up just in case... Does that mean non-shimano would make a better replacement?
@edscoble started
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Yup, one of these:
http://www.evanscycles.com/products/trek/elite-86-2014-mountain-bike-ec042077