I remember I saw somewhere new Sram system that does not require chainguide. Don't remember the model, but could you please tell me more about it? How does it work?
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SRAM XX1 is their new single chain ring setup. Very expensive and I have not even tried a demo, very wide range on the rear 11 speed cassette (10 x 42) and lots of chainrings available for the front.
My understanding is that the chainrings are designed to 'hold' the chain on. The chainring teeth are designed (wider and taller) to have a better grab of the chain.
Good review/article here: http://www.bikemag.com/gear/first-impressions-sram-xx1/ Good image of the chainring enlarged teeth here: http://www.bikemag.com/gear/srams-1x11-group-new-details-emerge/
answered Jun 27, 2013 at 17:49
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1A more affordable SRAM XO1 11 speed set up has been demo'ed on a number of 2014 bikes so should be available for 2014. Most current XX1 features should trickle down.– DWGKNZCommented Jun 27, 2013 at 20:14