What are the bike helmet laws in San Jose?

In California, all bicyclists and e-bike riders under the age of 18 are required to wear a properly fastened bike helmet.

Adults in California are not required to wear a helmet while riding a bicycle, a Class 1 e-bike, or a Class 2 e-bike.

For Class 3 e-bikes (which can reach 28 mph), helmets are required for all minors and adults.