Turn the bike upside down or, if you have one, place the wobbling wheel in a truing stand to straighten it. You must be able to freely spin the wheel, which will allow you to see where it wobbles and make minor adjustments.
How to fix a bike that feels wobbly?
The following is one of the easiest solutions for a bike that is feeling shaky or unstable. You may improve the stability of your handlebars by tightening the bolts on your handlebars. When you ride your bike, the vibrations cause bolts to come free, resulting in an unstable feeling on the bike.
How do you fix a loose hub on a bike?
Maintaining control of your bike, grasping the wheel at its highest point and shifting it from side to side. Your hub is loose if it moves at all, even if it does so with a clunking noise from time to time. If your hub is equipped with press-fit cartridge bearings, it is possible that there is no method to modify the hub tension. In such situation, you’ll need to replace your bearings.