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I have a 2015 CAAD10 with the Si Hollowgram crankset. Mine has FSA compact 50/34 chainrings. The 2016 CAAD12 has the Si Hollowgram crankset as well, but it has 50/34 Spidering chainring. I'm assuming that this new Spidering will be lighter but what is the difference in weight between both cranksets?
 
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