What BB length for william chainset

bm0p700f

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Got a single speed williams 3 pin chainset C1200? I think. It has fluted arms.

the question is what cottered axle do I need for it.
 
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I used a TDC No 9 with a single Williams C34, this is a fraction under 125mm LOA. In my experience it sometimes requires a little trial and error to sort this out but there is some guidance here which might be useful:http://www.classiclightweights.co.uk/bblengths.html

I hope that this is helpful...
 
I did not find that website that helpful but 125mm is where I though I might have to start so that where I will start.
 
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