Wow- Oh boy this is a real wake up call. All looks safe and secure until you see this kind rack pulled from concrete. I will now have second thoughts with these. Thanks for sharing!I've never been comfortable with many of the new bike racks they use now. Most only use simple 9/16" screws or easy to remove nuts to remove the rack right off the ground. Look at these, they tear out of the concrete because they use such wimpy hardware to fasten them down with.