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Tunnel Spring Professional Review and Guide
"On the west side of Flagstaff. This is a short but interesting loop accessible from Flagstaff. The return is a downhill cruise on smooth, wide singletrack.Sections of the doubletrack are rocky. Keep your speed down on the urban trail and watch for hikers, runners, and other cyclists."
--Bruce Grubbs, Mountain Biking Flagstaff and Sedona (Falcon Guides).
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