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Wheels out of true after installing tires?

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Wheels out of true after installing tires?

Old 05-21-23, 04:51 PM
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Wheels out of true after installing tires?

Neighbors just finished a rebuild of a Miyata step thru. Looks great, with light blue frame and VO shiny components. Iíll get a picture when I can.
Hereís the odd thing with the build: they said wheels were true until they installed the tires. Spokes were right length, a spoke tension gauge was used, they relieved spoke tension as they built. After a re-true, all seems fine.
Iíve never had wheels go out of true while installing tires. Is this something that happens? Should I tell them to park it? Itís got VO rear hub and Dynamo front with VO rims if that help.
signed
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Old 05-21-23, 05:08 PM
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I have seen tire expansion compress the rim a bit and let a few spokes release a bit of tension. Lowering air pressure and re-truing with the tires on is the easiest solution. HTH, MH
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Old 05-21-23, 05:28 PM
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Either there is a problem with the tensioning tool or how they used it. Tension was off or there would not be a problem after mounting the tires.
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Old 05-21-23, 05:35 PM
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Thanks for the answers. Further checking showed that the least experienced of the three people checked tension, so I’m putting the problem down to operator error. All seems fine now.
and here’s the Miyata 210


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Old 05-21-23, 10:18 PM
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Just for fun, I punched some numbers into the calcu-ma-lator.

I got about 5,000 pound imposed on the rim by the air pressure. There's probably more if you look laterally but I was thinking about the radial direction.

Individual spoke nipples see about 1 pound from the air pressure, relieving some of the tension (-350 psi) you carefully applied.

The thing is, it would do all that very uniformly.

Last edited by Bad Lag; 05-21-23 at 10:27 PM.
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Old 05-21-23, 10:39 PM
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This has been known to happen, especially with lightweight rims. Rear wheels can scooch a little to the right after a tire has been put on and inflated.

Since riding wheels with tires on them is what matters in the end, I do like to install one before doing my final truing. I'll then pass the existing tension around a bit as needed to get it running a little truer.
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