Robbins Crack 

As the story goes, in the 1960s Royal Robbins was shown this boulder, and it's striking 20ft crack. The cats that showed him the route boasted that they had already sent it, but didn't say that they did it via aid. It was that very day, that the Robbins Crack saw its first free ascent as bewildered eyes witnessed Royal's effort and so named the route.

If you want to add a little more to the climb start as a sit start. This makes for a nice additional move or two.

Crux is downclimbing, provided you did it without ropes...

For me it likes .75 camalots, and definitely not #2.

I thought I knew how to hand jam until I tried to climb this. It'll teach ya how to jam.

I've always used two #1 C4's on this climb. You could use a smaller cam or a nut in the off-fingers at the top if you wanted to. I'd like to see how you could get a #2 to fit into this crack.

I ran into Eric Beck at the Happy's a few years back and we got to talking about Mount Woodson. He told me that Robbins never climbed this route. The guys who did the first ascent just spread the rumor to get people to climb their route. Seeing how great the route is, the rumor seemed unnecessary.

I'm a terrible crack climber and this is one of my favorite climbs - I don't know if I'd ever consider soloing it though. The 4yr old kid in the picture makes me look like a 2 yr old haha.

This crack accepts all forms of credit... Just insert and slide through!!!!

For such a classic climb, I'm surprised how inconsistent the information is. Or maybe people just repeat what they heard and sometimes get it wrong.
35ft and 20 ft were listed here, and the guidebook says 24ft.
The Mountain Project description says the crack is the same size the entire climb, yet also says the crack widens for perfect hands after 15ft up.
Then there are comments on gear from .75 to 2.
Guess it's time for me to find out for myself next outing.