Every rental bike has to be properly maintained for a safe and comfortable riding. Brakes have to work effectively and derailleurs have to work swiftly.
If a bike falls to right hand side, the rear derailleur hanger sometimes bends towards inside. It may cause the chain to fall inside and eventually cause the frame to be broken. So, it has to be fixed before the next ride. We have two bicycles that appear to have the hanger problem.
Today, on a rainy day, it is a good chance to fix the problem. The tool is specifically designed to check the alignment and fix it. The hangers are perfectly fixed now.
Nothing is more important than safety.