Originally Posted by
ehcoplex
I was more asking if there's any general 'rule of thumb' for spindle length if going from asymmetrical to symmetrical. Yeah, the Stronglight and TA BBs are nice, and still out there to be found (though not getting any cheaper), and for my own bikes that'd be my choice. But I'm doing a sort of resto-mod build for a friend with a Stronglight 49D. The original Stronglight BB is badly pitted (they generally seem pretty bulletproof- I'm guessing grit/dirt got into it at some point and a PO continued grinding away with it.....) and I think a sealed BB is going to be the way to go, so I was sort of trying to zero on on a spindle length for a symmetrical BB (assuming I'll need to use a spacer(s), too).
I'm in pretty much the same situation.
Got a 1961 Holdsworth Cyclone frame that had cracked Bayliss Wiley cups and a Brampton spindle.
I've now got a 49D and some new TA rings for it, but probably have to use a sealed BB.
My research shows Tange Seiki LN-7922 (or cheaper LN-3922) at around 68x115mm would probably work, but I've got no proof.
Sheldon mentions a Shimano UN52 115mm for a Hetchins:
https://sheldonbrown.com/bbsize.html#ta but I think that's asymmetric.
So I'm planning to get a cheap LN-3922 and monkey around with it a bit, unless somebody has any definite info.