Joined: Jan 2010
Posts: 9,781
Likes: 1,750
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
FWIW, a Shimano 115mm cartridge bottom bracket will practically last forever and will duplicate the chainline you would get using the 118 SL spindle.
I forced the English Shimano into the Swiss-threaded Peugeot bb shell and ended up with a slightly shorter chainline measurement, but I used the shorter 113mm size.
The taper difference is enough to make the Shimano (JIS) bb spindle fit like it was about 5mm longer than it is.
The Shimano also is symmetrical vs the Stronglight's slightly-offset stance, so the 115mm Shimano works perfect.
You could even duplicate the Stronglight's slight offset using a 1mm spacer under the cartridge bb's cup flange.