I ride a superfly 100 17.5 now and it fits perfect. Im 5'9" with a 35' inseam. Not sure if I would need a 18.5 or 17.5 fuel ex 29. as the superfly 100 and fuel ex 29 are sized differently. The wheelbase and toptube on the 17.5 on the fuel seem to match up the best to my superfly. but the seattube is only 16.5, not sure if i would have a "flag pole" seatpost.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: fuel ex 29 sizing