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I can get the cheaper Si arms in 165mm from Canada. Maybe I should get them?
If you have to have 165mm arms then get them from anywhere you can find them because the mothership either doesn't have any or is not making enough to get many in to retail.
If price is a consideration then the difference between Si Hollowforged and SiSL2 is a few grams and a bit of lazer etching
Experts have 165mm SiSL2 crank arms in stock but not the BB:
You only really need the axle out of all of that lot - bearings, covers, wavey washers and spacers are all interchangable from other BB kits.
And you only need the axle if it turns out your chainstays are too wide to run the Si arms with the 104mm axle you have.
Qwerty seems to have the complete BB kit though. UK seller and nice guys.
Experts have 165mm SiSL2 crank arms in stock but not the BB:
http://www.cannondaleexperts.com/Cannondale-BB30-SiSL2-Bottom-Bracket-Set-68mm-Shell-Set-Complete--QC690-2015_p_4275.html
I can get the cheaper Si arms in 165mm from Canada. Maybe I should get them?