Robles Loop from Genser Trailhead
ElevationAscent: 892' 272 m
Descent: -901' -275 m
High: 2,888' 880 m
Low: 2,552' 778 m
GradeAvg Grade: 3% (1°)
Max Grade: 11% (6°)
Current trail conditions
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“A lesser known loop in the Tucson Mountains with great flow and fun climbs.”— Drew Laskowski
This ride starts at the Genser trailhead, near the Starr Pass Marriott. The first mile and a half are the same as the Starr Pass Main Loop. After taking a left at one of TMP's three-way intersections, you'll navigate a series of flowing trails with fun obstacles to progress south towards Ajo road. Once you cross under Ajo via the culvert you'll be rewarded with fast, flowy, occasionally rocky singletrack. Most of the Robles loop is of intermediate difficulty, but the climb on Bittersweet trail will challenge even the most experienced riders.
At the third three-way junction go right, heading to the SSE on the 36th Street Trail. From here the trail becomes a bit rocky and you'll cross in and out of washes. Follow the tire tracks to make sure you come out on singletrack on the other side. At the next three-way junction you encounter, go right to head south again on an unnamed connector trail. If you were to go left at this intersection you would continue on the 36th Street Trail and eventually reach the 36th St. Trailhead, which is an option if you'd like to keep the ride under 10 mi and still reach Robles.
In a few hundred meters the trail spits you out on a paved road in a neighborhood. Progress south on said road (Mockingbird Ln) until you see a two track heading almost directly south, up a hill, branching from the road. At the top of this short hill this unnamed trail becomes singletrack once more. There is usually a "no hunting" sign posted here. See the photos for a picture of this location.
Once you've crested the hill starting with the "no hunting" sign, which is no small feat, bear left at the three way junction and you'll be rewarded with a fun, fast descent. You'll cross a two-track road before you reach the Ajo culverts. The first culvert you'll cross under can be accessed by descending a short ways into the wash from the small parking area on the roadside. See photos for a shot of this 4' culvert. It's rideable, even for a tall person like me, but be careful of debris in the darkness. Lest you think that this culvert crossing cannot be the official trail, a very official looking trail map is posted on the immediate south side of Ajo road, at the exit of the culvert. Since the Robles trails are so well marked, detailed turn instructions are not included here in favor of a general trail to trail to trail approach.
Once you are in the Robles system, you'll ascend a fast, flowing switchback climb away from Ajo Road. Make a clockwise loop around the system on Ledge Surfer, the east side of Camaro Loop, then Bittersweet Trail. The hill on Bittersweet is an excellent technical and fitness challenge, but can be skipped using the west side of the Camaro Loop connected to the Sunset Pass Trail. Bittersweet terminates at the Sunset Pass Trail just before it ends at the second culvert (6' this time).
Cross under the second culvert and proceed north on Explorer Trail until you reach another three-way junction. Take a right to stay on the Explorer Trail (the left side sends you over a technical climb on the Cat Mountain Trail). At the next junction you'll take a left to retrace your steps back towards the 36th Street Trail on the unnamed connector. To finish off this ride, take a right at the three-way junction and head east on the Starr Pass Trail, towards the Starr Pass golf course.
Take a left at the intersection soon after you cross through a gated (always open) fence, before you start descending, to connect to the Rock Wren Trail. This connector ascends the infamous "F*&$ You Hill". If you have ridden this hill before you'll understand the name. Pro tip: stay left when you attempt this steep, loose, two-pitched climb. Once you reach the top, turn right on Rock Wren Trail to end at the Genser Trailhead.
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We need help with the following missing trail information:
Dogs Allowed, Features, E-Bikes Allowed, History & Background
Local Club: Sonoran Desert Mountain Bicyclists
Land Manager: Pima County - Natural Resources, Parks and Recreation