If people know how to parallel park it could be cut down to 10 bikes. But we have NO standards for getting a license, compared to some other countries.
At 16 years old I almost laughed out loud at the size of the parking spot they had me park in. I was in a old Subaru sedan, I kid you not, the space
the DMV had set up was enought space to park a full size, 4 door, long bed pick-up with a good 2-3 feet at EITHER end after parking.

I see why cars need to be made safer, the drivers can't/won't be made safer. What a joke.

At least 35% of all on-street downtown parking, in all big cities, should be removed. It would most certainly encourage folks to find other means of getting down town,
naturally boosting public, and leg power transportation. It also would serve to get more people out of their little bubbles and interact with their city and its other inhabitants.
Though folks from the suburbs are in no hurry to mingle with city folk.

I just realized I'm in a car-free forum, effectively preaching to the choir. Good times