San Diegos Non-Profit Do-It-Yourself bike repair Open Sundays 10am-3pm Used bikes for sale and Parts for fixing your bike Donations appreciated. Volunteer Opportunities Available. Located at the PopUp15 Lot: 4050 El Cajon Blvd, City Heights, San Diego 92105
Ebike Store at 2907 Shelter Island Blvd opening November 2021
http://voltebikesusa.com
Sheldon Brown
http://sheldonbrown.com
Website with a very comprehensive guide to bicycle repair
Bike Index
bikeindex.org
Website to register your bikes Serial Number, report a stolen bike, check the S.N. of a bike before purchasing to make sure it is ‘clean.’