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Old 10-25-12, 09:38 AM
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FBinNY 
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Join Date: Apr 2009
Location: New Rochelle, NY
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Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

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The bulge is either normal weld distortion, which is why they used a shim originally, or is because of a slight bend which is why the 31.6 no longer fits.

You might go to the Raleigh site, or phone them to confirm the original spec. Otherwise, you can measure the wall thickness of the shim, double that and subtract from 31.6 to get the ID (if you're 100% sure that 31.6 is the right starting place. Or you can carefully close the shim until the slot is the same width as the bottom of the slot in the frame, and measure the ID at the bottom, so it isn't affected by the distortion at the top.
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