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Untrue tire on a true rim

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Untrue tire on a true rim

Old 07-06-17, 07:48 AM
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Untrue tire on a true rim

Bought a new bike and got it all set up however the back wheel seemed like it wobbles side to side. Took it back and they trued the rim again which seems fine but it still wobbles side to side.

1. Is this because the tire isnt seated properly in the rim?

2. Does this really affect anything?

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Old 07-06-17, 08:03 AM
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Originally Posted by IHaveNoIdea0 View Post
Bought a new bike and got it all set up however the back wheel seemed like it wobbles side to side. Took it back and they trued the rim again which seems fine but it still wobbles side to side.

1. Is this because the tire isnt seated properly in the rim?

2. Does this really affect anything?

1. It could be. Identify where the wobble is, mark it somehow so that you know where to look, and deflate the tire. Try to get the bead mounted better.

2. Yes and no. In the grand scheme of things, it probably won't matter too much. The bike might feel a bit squirrelly at high speeds but bicycles rarely get up to speeds where it will have much effect on handling. On the other hand it can drive you crazy.
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Old 07-06-17, 10:54 AM
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Check where the tire is mounted to the rim where the wobble is. You should see an even relationship of the sidewall of the tire to the lip of the rim. If there's a dip, try pulling the tire away from it to get it to seat. Another trick is to lubricate the rim with soapy water or isopropanol and inflate the tire to its maximum rated pressure. Your bike shop should be able to sort this out as it's a pretty common problem.
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Old 07-06-17, 03:52 PM
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As stated check the bead to be sure it's fully seated. If it is, you could have a minor defect in the tire. That happens sometimes. Will it hurt? Probably not. If it bugs you, ask the shop if they will replace with an in-kind tire. If they want to charge you, ride it.


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Old 07-06-17, 04:11 PM
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Without seeing your bike my bet is that the wobble is adjacent to the valve stem. If that's the case, do this:

1. Deflate your tire.
2. Push your valve stem in toward the rim.
3. Re-inflate your tire.

The inner tube where the valve stem is attached is a little thicker than everywhere else. Sometimes that thicker section prevents the tire bead from seating properly. Pushing the valve stem inward fixes that problem.
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Old 07-06-17, 06:03 PM
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a trick i use on just about EVERY bike tire... inflate the tire/tube to about 10 lbs. pressure... grab the tire with both hands, and twist it some, side to side... do this at positions all around the rim... then air it up to ride pressure...

and SOME really cheap tires are just plain funky from the factory... Sunlite gumwall tires comes to mind.... there are others...

and then... there is the occasional 700c tire stretched onto a 27" rim...... sigh.

and failing sidewalls... broken bead wires..... too long of tubes doubled over inside the tire... and one fairly effective duct taped tube "repair"..... it held up for 50 miles, i hear!

Last edited by maddog34; 07-06-17 at 06:09 PM.
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