Fitting a Stronglight Compact double to my S6L .... what length Bottom bracket?

[Fab Foodie]

Dears

I think I'm narrowing in on using my B for my Outer Hebrides tour in a few weeks time.
The major lumpy bits are on Harris and this makes a good excuse to add a Stronglight Compact Double 50/34 instead of my 44T.  I miss the 50T and the 34 will help me up the steep bits when loaded.

Question is ... I guess I need to replace the BB or get spacers to move it out slightly.  What's the deal here?  What do I need to get .... time is running out!!!!!

[Fab Foodie]

Bump?

[Tim Hall]

what chainline is recommended for each of the chainsets? 

[Tim Hall]

Or, put it another way, what length BB do you currently have? Spa say the Stronglight compact double takes a 107mm long BB.

[Fab Foodie]

Or, put it another way, what length BB do you currently have? Spa say the Stronglight compact double takes a 107mm long BB.

Dunno Tim .... but the Compact fits perfectly onto the existing BB ... Hooray!

[Kim]

FWIW, 113mm works for an XD2 double.

Whatever Spa say will be largely meaningless, as the limiting factor is what fouls during the fold.