Bike Forums - View Single Post - Need help with a BB shell with no threads

11-02-21 | 12:21 PM

#22

scarlson

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Joined: Jun 2010

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From: Medford MA

Bikes: Ron Cooper touring, 1959 Jack Taylor 650b ladyback touring tandem, Vitus 979, Joe Bell painted Claud Butler Dalesman, Colin Laing curved tube tandem, heavily-Dilberted 1982 Trek 6xx, René Herse tandem

Quote:

Originally Posted by unworthy1

AND you'd want a shop to machine the chamfers on the outbound BB shell edges...

If you look closely, there are chamfers on the inner edges of the sleeve already. That and not matching up with any of the Thompson diameters makes me think it's meant for the "Mavic" style BB (similar to the YST/Sunlite).

However, if the sleeve is removed, it may match up with the bigger 38mm Thompson.

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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.

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