I've read that the smaller xxi spider and chainrings are more expensive to produce, thus the larger bcd on x01. http://www.bikeradar.com/mtb/news/article/sram-x01-groupset-first-look-38021/ The only negative of this larger bcd the mention, is that you will not be able to run a front chainring smaller than 30. Are there any other notable factors to take into account?
