Thread: 531 top tube crack!!! Any vintage experts out there?
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Old 12-31-09, 11:40 PM
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MikeWinVA
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It is a steel frame. Run it by a machine shop and have them magnaflux it. That will tell if it is cracked. It is not an invasive test (shouldn't require sanding the paint).

http://en.wikipedia.org/wiki/Magnaflux
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