Something I am not sure was mentioned here was dynamic loads. You could secure a bicycle mount to your wall using one of the aforementioned anchors, however the repetitiveness of bring the bike on and off the mount will cause the drywall to fail, and it will come crashing down at some point. Anchors are good for static loads. For dynamic loads, you will still need to find a stud. This is made even more complicated these days with the introduction of metal studs in so many buildings. At that point, a molly or toggle bolt into a metal stud is going to be your best bet.