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Old 05-17-20, 02:35 PM
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merlinrkd
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Join Date: Jul 2019
Location: Yuba City CA
Posts: 24

Bikes: BMZ Performance Touring

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Columbus SL Frame-Loose rear dropout

I have a home built Columbus frame. Builder unknown. Rumored to have been built by a wealthy man's teenage son. Circa 1980's. Has the rifled steerer tube. Columbus dropouts, Cinelli BB. Cinelli style fastback seat post binder. Forged crown. Bike was snatched at a garage sale by a friend. Frame and fork are very straight

I built it with budget components and gave it to a neighbors kid. He rode it thousands of miles. After a few years he said it made noises. Noticed a rear dropout had separated from the chain stay. Frame alignment wasn't affected.

Gave him another frame.

Wondering about a quick backyard fix. I have a torch and have done a fair amount of brazing. Built a Reynolds 531 touring frame in 1982.

I can see the affected dropout tang had insufficient bronze and poor penetration. It seems feasible to get a stick of low fuming bronze and flux. Heat it until the existing bronze is liquid and moves down the chainstay. Then add some bronze.

Any advice? Can't figure how to load pictures.
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