This is a 26.5-mile figure-8-shaped loop with 300 feet of climbing.
Road conditions
Riding conditions are generally good, although you can improve them by going during off-peak traffic hours. Central Road and Bear Valley Road can be a bit hostile to cyclists at times.
Maps
Variations
There are numerous places along the route to use as a start/stop point. Also, you can stay on Outer Highway 18 East instead of deviating in the residential area.
Notes
Thanks to gtrpimp76 for providing this data.