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Jordan rapp studied this I'll try and post a working link but you can find it at rappstar.com 1x friction files but narrow wide rings showed no loss of efficiency due to increased friction as the teeth are taller but narrower. Approx 4w aero saving at 30mph for standard round aero/solid 1xring but aerocoach "claim" 5-6w at the same speed due to increased efficiency from their not oval oval shape. Shame their QC is dog shit
Retro_Bastard
@hippy
Does anyone have any data regarding Narrow Wide chainrings for TT use? Are they any more or less efficient than normal rings? If they are less efficient, could their extra chain retention ability make up for losing a front derailer or chainguide?