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angle markings on lugs

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angle markings on lugs

Old 02-05-23, 10:08 AM
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angle markings on lugs


this is a german built muscle bike frame from the late 1960's

note the ESGE plate style bridges


it was badged as Brillant (not a typo)

the upper head lug carries a "74" angle marking, nothing unusual there


the lower head lug carries a "6330" angle marking with the "63" in a larger font than the "30" to indicate 63 degrees and thirty minutes(!)


has anyone else ever encountered and angle marking on a lug which goes down to minutes?


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Old 02-05-23, 10:26 AM
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I have seen it on Nervex BB. This is probably more of a C&V question. Since the advent of investment cast lugs in the late '70s, multiple lug sizes don't generally exist. You still see degree markings sometimes. Just something else to clean up.
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Old 02-05-23, 12:01 PM
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What is a frame builder's aspect is the welded spots along the head lugs. I have seen this as a method of tacking before brazing but on low cost Asian made bikes from the 1970s/1980s. There's verry little new under the frame making sun.

I hope the OP isn't assuming that the actual geometry numbers that the frame factory built to are what the lug manufacturer stamped on the lugs. Given the rather crude brazing and finishing (head tube facing as example) I wouldn't assume much. Andy
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