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non gear case clearance = for single sprocket on the rear
source: http://www.classiclightweights.co.uk/bblengths.html
for the model 15 see the table on that page for the specifications.are the BB cups marked with 'O'?
Big_Block
Not sure if this is exactly the right place but you're a knowledgeable lot. Can someone help me with a bottom bracket please? Although you'll no doubt disapprove I am replacing a Bayliss Wiley cottered bottom bracket (which i think dates to around 1955) with a modern sealed unit for a 1950s claud butler to be used as a town bike by my GF.
This is the BB I've taken out of the frame - for reference.
It has not many useful markings on it, but I tried a UN54 for size and it seems to be a different diameter, before even thinking about the threading etc.
I see no marks on the BB anywhere that are helpful apart from 15NGCC on the spindle, which I believe means "non-gear case clearance", i.e. it was only ever single speed [?] [or had a planetary hub ???]. If anyone can point me in the right direction I would be v grateful
Anyway, this doesn't help with my immediate problem of replacing it. Original BB will be available in due course either for sale at an extortionate rate on ebay or in the general classifieds or to a nice chap from this thread at something more reasonable :)