How can I tighten or repair bicycle tire bearing?

my back bike tire is shaking and i know it's not suppose to do that. how can i fix it without having to get a whole new tire.

Sounds like you are referring to the wheel and not the tire. The tire is the rubber part.

Bicycle wheel bearings can be adjusted using tools called cone wrenches. A cone wrench is a very flat wrench that will hold the cone-shaped bearing surface steady while a jam nut is tighted. The cone can be turned to tighten it up so that there is no play, but the wheel still spins easily. Then, using a cone wrench, hold the cone steady while you tighten the jam nut.

Not all bearings are adjustable this way. Some may need to be replaced as a unit, which could require pressing the bearing out and pressing a new bearing in.

Finally, it should be noted that the bearing is not always the cause for a shaky wheel. It could be that the wheel is not true, and/or is out of round. Truing a wheel can be done with a spoke wrench and some patience. An out of round wheel will probably need to be replaced.

it's not the bearing it's the spokes tighten them individually with a tool

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