Just guessing here, but could it be a way to try and prevent the drive side BB cup from unscrewing? As we know, the drive side of English and many other BBs has a LH thread to keep it from unscrewing due to the bearing action. Italian all RH thread BBs can theoretically unscrew on the right RH side. If clamp isn't a Legnano feature, maybe it's something added by a previous owner.
-- John Betmanis Woodstock, Ontario Canada
On 08/02/2011 9:46 PM, Leonard Diamond wrote:
> Noodling around ebay I came across an auction of a repainted 1960's Legnano.
> The third to last photo is of the bottom bracket and it shows a nut and bolt
> on the underside of the drive side. I was wondering if someone could tell me
> what it is for?
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> http://tinyurl.com/
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> Thanks!
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> Len Diamond
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> Ridgewood, New Jersey USA