I swapped out the 2X10 120mm/80mm bolt center diameter 39-26 tooth (ie Sram XX compatible) spider that shipped OEM on my 2013 Scalpel for the also-supplied 3X9 104mm/64mm BCD spider set up with Truvativ 2X10 38-34 chainrings and a bashguard. I've seen that CannondaleExperts is now selling a 104/64mm 2X10 spider (for $130) but I thought I'd give the 3X9 with 2X10 rings a try first. Before switching, the gearing on 39-26X11-36 wasn't as tall (tough) as I thought it would be, but I like the idea of trading 1 big gear for two extra climbing gears. My regular rides often exceed ~1000 feet of climbing for every 10 miles of trails. Using a 11-36 tooth cassette will take my climbing ratio from 0.72 to 0.67 ... which is a lot closer to the 0.64 ratio I had on my 3X9. The FD set up pretty nice on the new rings, and the bash guard provided a pretty clean look. I'll ride this tomorrow and let everyone know how it works.
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Thread: 104/64mm BCD Spider on SISLCrank
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