This ordinance is very poorly worded.
1. Municipalities shouldn't have custom definitions of "Bicycle" in their municipal codes. The state definition CVC 231 will take precedence. Moreover, you shouldn't create a definition just for one ordinance. (Note: Yes, the definition of "bicycle" should probably be updated along with many of the other transportation devices.)
2. The "Bicycle Part" definition is unnecessary and insufficiently comprehensive. They don't mention wheels, tires, tubes, grips, stems, brake levers, shifters, chainrings, seatposts, etc. They could be vague and say, "bicycle parts and other hardware intended to be affixed to a bicycle" and be done with it. If someone were to argue "WeLl WhAt ExAcTlY iS a BiKe PaRt?!" they would be laughed out.
3. Why define person? They could simply say, "Any person or organizational entity".
4. There are many, many homeless encampments that have been explicitly established on public land. This ordinance makes it illegal for those homeless people to repair their own bikes where they live.
5. This also makes it illegal for people to use bicycle repair stands placed on public land unless that bicycle became inoperable while being ridden on public land. Like, if you whammied your drivetrain at home and wanted to take your bike to the park one block over where there's a public bike repair stand, too bad.
6. Also, it seems to be illegal to make a transaction to sell multiple used bicycles in public due to this ordinance despite MANY suggestions by MANY municipalities to do all person-to-person transactions in a public space for your own safety.
Don't get me wrong. I understand the intent of the legislation-- they're trying to attack chop shops (organized and ad hoc). But the wording is poor and, personally, I think they'd be better off going after people who habitually resell stolen bikes (disreputable bike shops, frequent Craiglisters, etc.) than be held responsible for the unintended consequences here.
Take out the fences and you drastically reduce the reward for stealing bicycles. A bicycle being stolen for personal use is a much lesser evil to live with as compared to U-Hauls full of stolen bikes being moved around for resale by shady business owners.
Ramon