I have used these to mount hanging desks with PCs setting on them on drywall with no problem. They claim they hold 265 lbs in 1/2-in drywall. That is enough to mount a 1967 Schwinn Breeze. What do you ride?
https://www.lowes.com/pd/TOGGLER-10-...B&gclsrc=aw.ds
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"One of the most important days of my life was when I learned to ride a bicycle" -- Michael Palin