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Tubing gauges?

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Tubing gauges?

Old 08-17-11, 12:36 PM
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Tubing gauges?

I was looking at the old Bridgestone catalogs on Sheldon Brown's site, and saw that they spec their tubing thickness in gauges. The MB-2 I just got is listed as 16-gauge. Are these the same gauges as wire and spokes are spec'd at? That would mean that the tubing thickness is around 1.6mm thick, which seems HUGE by today's standards! Is that accurate, or was there some other gauge reference?


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Old 08-19-11, 07:00 PM
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The seat tube should be 28.6mm outside diameter (OD). Subtract the seat post diameter (should be label near the bottom senter of the post below the minimum insertion line) from the OD and divide by 2, and the subtract another .1MM. That should be the thickness of the seat tube. You can then find any one of several old tubing chards and probably find something close. I am not sure if Bridgestone actually made their own tubing, or simply had it made under their label. They dropped thier tubing for other stuff (Tange and Ishiwata) by the late 80's.
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Old 08-19-11, 07:30 PM
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Gauged wall thickness would be US Std, I think. 16 gauge is about 1/16" (0.0625" or about 1.5 mm) thick. Reynolds 531 double-butted was originally sold in gauges, and came in about 20-21 gauge at the butted part, and 24 or 26 in the middle. That's in the range of 0.9 mm at the butt, and 0.6 or 0.7 in the middle.
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