Bottom bracket length XTR M900

Re:

Hmm, from the Surly website we get: "the Surly New hubs, put your cog into a nice position outwards from the centre of the dropouts, approximately 53.5mm for MTB".

Knowing this, do you think I should go wider, as in 113, as I'm using the 'outer' chainring position only, and only the smallest, most outboard sprocket position if it were a cassette?
 
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