This ride in the Auburn Ravine includes all of the major trails on both sides of the ravine plus the connector trail and the Foresthill Divide Loop. This ride is for people who are in excellent physical condition. The ride can either start at the trailhead on Russell Road or down in the Confluence Area on Old Foresthill road. The only difference between the rides is whether you start with the Stagecoach Climb or end with it. I prefer ending the ride with a downhill so usually start in the Confluence Area.
Note: I don't recommend riding this route in the heat of the summer, while most of the Auburn Trails are decently shady this route includes the Fuelbreak Trail which has some steep sections of trail. It's brutal any time of year but during the summer there is no shade at all on the section which makes it doubly brutal. You have been warned. The _Triple Loop_ has just as much mileage but a touch less singletrack and a lot less suffering.
Starting From the Top
Take I-80 East from Sacramento to Auburn, exit on Lincoln, and turn right. Turn left almost immediately onto Russell Road and it will wind downhill (careful it's a 1 lane road) for about a half mile. You will see a dirt parking area on the left, park there. If you want to take Manzanita then DON'T take the Stagecoach trail at this point. Get on your bike and go down Russell road. Russell Road Y's after a short distance, go left and the road will dead end into the trailhead. After getting onto the trail you want to take a left onto the singletrack trail.
Starting From the Bottom
Take I-80 East from Sacramento to Auburn and turn off on the Hiway 49 exit. Carefully follow the signs to Hiway 49 South. Follow Hiway 49 into the Ravine until 49 turns right across the American River. At this point continue straight for another ~1/2 mile and start looking for parking. This area is the confluence of the North and South Forks of the American River. The road will shortly cross the North Fork of the river. The trailhead is on the West bank of the North Fork American River. If you start at the bottom and want to ride Manzanita ride to the top trailhead and follow the instructions above to take Manzanita.
Auburn Everything - Trogs - I did the everything loop with the Trogs and a few others from MTBR.
Monster MTBR Ride in Auburn - An awesome ride I did with a huge MTBR group in Auburn.