Looking at the Moto Outcast. Have ridden a Rig 17.5 and it fits really well.
After sitting on a Fuji Tahoe 29 small (17) that was REALLY small. I wonder if the Trek is bigger and what size does the Moto run towards?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Moto Outcast vs Trek Rig Sizing