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according to bikemag.com/gear/srams-1x11-group-new-details-emerge/ they're looking at a 42T rear cog
That's for the XX1 MTB group. Road bikes probably won't need or want such a wide range.
http://www.cyclingnews.com/news/sram-brings-1x-tech-to-the-road-sram-r1I have extreme gears of 48/12 and 34/23 at the moment, so I could bin the inner ring and fit a 12-32 cassette and be no worse off apart from the bigger jumps. 44/11-36 would give the same range as I'd have if I finally got around to buying the 12-27 cassette I've been promising myself for the last couple of years.
gbj_tester
Yet again I am ahead of trend. Having now Googled it according to http://www.bikemag.com/gear/srams-1x11-group-new-details-emerge/ they're looking at a 42T rear cog. Now that's a dinner plate.
This is, of course, a very good idea. Would you fit the single ring inside or outside the spider?