Is it illegal to ride a bike on the sidewallk in california?

That would be a yes. If there are designated lanes for a bicycle then the rider must use it.
 
I can't say for sure since I don't know the law, (and nobody else here has actually cited it), but in Toronto you're only allowed on the sidewalk if your wheels are 24" or smaller. I'll bet that in actuality California law may have similar complications.
 
Yes. However, local authorities in some areas might let you get away with it. Still they can ticket you if they feel like it.
 
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