Any chance I can convince you people to start at the base of Mt Baldy?
(Still hoping to simply roll out of bed and show up at the start still half asleep.) It's a relaxed cruise to the base of GMR from there, then a climb up GMR and across GRR to Baldy Village. The ride time up GMR is about the same as the ride time across GRR. GRR is longer, but it's not continuous climbing. Finally, the 8 miles of virtually continuous descending back to the start (one short uphill section you can hit at 50 MPH and easily stay in the big ring, one false flat, the rest all downhill) is a fast-pace reward for the earlier effort. There are at least four spots on the descent where under the right conditions, 50+ MPH speeds are quite attainable. And no particularly sharp turns.