Quote:
Originally Posted by ptourkin
That was just an example. I don't know what chainring they are running - I'm sure it's out there somewhere. I just quoted 42 as that as how a lot of 1X are being sold. I suspect they are going bigger.
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Friction Facts did some testing on drive losses between typical large and small chainrings (53 & 39) different rear sprocket sizes for their study on the best gear selection for efficiency. Bike Radar had an
article on their data and findings. The published data suggests that the 1x system, with its smaller chainring and larger cross-chaining angles, may be losing up to 2 - 3 Watts in some gear combinations (the worst would be the 42x9). The losses will be smaller in other gear combinations, but even still, the extra losses will probably not be compensated for by the lower weight of a 1x system, except maybe up the steepest climbs (but if bikes are already at the minimum weight allowed by the rules, they may not be able to harvest any gains from weight savings). There may be some aero gains with a 1x system, but I don't think this has ever been quantified.