Haha, which streets? I'm a bike messenger here in SF and haven't noticed any streets that are noticeably bike-paced. I have noticed car-paced series of lights like fell/oak/masonic in the haight where you have to book it at 30-40mph to make it through efficiently.

Edit: now that i'm thinking about it, a lot of the streets in the TL, fidi, and soma are pretty well timed for bikes, but for a faster pace, like 20 or so, and maybe 25-30 for the big soma streets like folsom, howard, harrison, bryant.