This is a 30 mile gravel/mud grind loop from Bear Valley
Trailhead. 95 % dirt, 2/6 singletrack, epic vistas, tough climbs, shady forest, and tons of gravel.
The ride starts out at Bear valley visitor center were the only tarmac is ridden up Bolinas Ridge
trail, which is a double tracked fire road. A steep and narrow decent is taken on McCurdy
trail down to Olema Valley
trail, which is a singled track muddy/dusty epic grind, this grind contains two easy creek crossings (one has a long which can be hiked and the other is shallow and is ridden through) and roughly 1000 ft more elevation than MTB project predicts. The ride continues up to Glen
Camp on Stewards trail, a double tracked fire road, where you'll have to hike your bike to bear valley trail, it’s about 1.5 mile. Take Bear valley trail to the start of the trailhead to finish the loop.
The ride can be ridden on any gravel grinder/CC with 35-40 mm tires or hard tail bikes. At approx. 30 miles and 4670 ft of ascent/decent this is a long day in the saddle (note MTB projects does not predict the elevation on Olmea valley trail correctly). The trail is designed for those wanting a combination of gorgeous views, minimum tarmac, the smell of the deep forest, and a few creek crossings for the adventures spirit.
The ride is not that technical, except the decent on McCurdy
trail, which is a narrow fast trail that can be hard on gravel grinder/CC bikes and the technical rating is therefore moderate.
Need to Know
Be prepared with plenty of food, water, tube, pump, multi-tool, etc. Most of the trail has no service.
Water is only available at Stewart
Horse camp, and Glen
Camp - bring therefore plenty.
Keep cattle gates closed on Bolinas Ridge
and expect a few horse riders close to the five brooks ranch.