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Why does my back tire on my bike wobble when I ride my bike?



I just put a new tube in so I had to take the tire off.
Everything lines up fine when I put the tire back on.
It wobbles just a little bit and I think the rim might be damaged or slightly bent because everything is on straight.
I have tried taking it off and putting it back on and it still keeps wobbling

All the answers could be right. But let me be clear, because you just changed the tube I think it maybe because the tire isn't seated evenly on the rim.

Sometimes the tube is caught under the tire bead or the tire is a little loose fitting and doesn't sit on the rim evenly. Spin the wheel looking closely at the edge of the rim watching the tire bead. Does it look like it's going up and down a little in one or several spots? Be sure to check both sides.

If so, deflate it and pull the tire away from the rim. If the tube is showing it isn't completely inside the tire, work it in and inflate. If the tube is OK you may have to inflate a little and manipulate the tire on the rim to get it even.

Hope that makes sense, this is very common.
1. Rim is bent
2. Not centered on frame
3. Tube might not be seated right inside tire. Could be knotted up inside the tire.

If 1 or 2 doesn't work. Take the tube out and reinsert it again.
I had the same problem. There is probably a dent in the rim that prevents it from rolling straight. Check along edges for any disfigurement. I had my rim replaced for around $100 at a decent bike shop. You don't want to take any chances with a wobbly tire, especially at a high speed, the tire will be vulnerable. Good luck!
Same experience.
You probably have a loose spoke somewhere. Try truing your wheel and if you don't know how and don't have a truing stand and spoke wrench just take it to your local shop and they probably can get that wobble taken care of for a minimal cost.
Could be "out of true". Take it to a bike shop and they can tighten/adjust the spokes to "true" the wheel.
Your rim is probably out of true, but it could be a loose axle too.
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