I get down to Los Angeles on business frequently and I'm going to say over either Thu or Fri night to do the infamous GMR. I looks like if one wanted to do a 40 mile or so round trip you would just keep going when GMR becomes GRR. This is the normal routing as I recall from the many posts on the subject. Anything else I should know? I would obviously plan on starting no later than 0700 to avoid the higher temperatures.
On second thought - it looks like if you're going that far you might as well keep going and descent Mt. Baldy Road.