After ogling pics of Trek's concept bikepacking ride, I had a chance to spend some quality time on a Trek 520 today.
While it might seem more road-touring oriented at first, I was surprised to see that it had tons of tire clearance. These are 32s...I think 40s would fit.
I was also pleasantly surprised to see how versatile it was on varying surfaces. Even with the 32s, it was pretty happy on gravel and doubletrack.
Full thoughts are over at the blog. Thanks to North Central Cyclery for the demo.
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Thread: Trek 520 Touring Rig Review