Alright, I have discussed this a little in another thread and now about to jump in but have a few questions from my trusted Fat Friends. I'm planning to have a Shimano 2009 SLX crank with external BB modified by a local machine shop to fit a 100mm BB. Now originally the spindle is for 68-73mm BB and my question is how much should I have it extended? Should I make up the difference between 68mm and 100mm or 73mm and 100mm (i.e. add 32 or 27mm) to the shaft? I also need to leave enough room for the e-type front dérailleur.
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