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Really? They're not using chainguides or anything? In 'cross that seems mental. All the DH peeps seem to run chainguides.
Not sure - big ring front but small at the back might allow the chain to get whippy, especially bouncing over potholes and stuff. But I've no experience with 1x11 so this is all just guessing.
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Also bigger chainrings might(?) help reduce the chances of dropping a chain due to bigger wrap....
More wrap doesn't matter because wrapped chain isn't taking part in the meshing process.
A larger diameter chainring does mean the distance between "tooth is starting to enter the gap between plates" and "roller fully in the cut between teeth" is greater, and the difference in tooth-plategap interaction depth between one tooth and the next is less, so if the chain angle is such that it's close to derailing, there are more teeth that might make sure it happens...
Narrow-wide means the a partially-meshed tooth in a wider plategap will still interact with the plate and reduce the chance of the next tooth missing the plates and derailing the chain.
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hippy
Emyr
@danb
Plenty of people run narrow/wide chainrings in cyclocross without clutched rear mechs or front mech guides - and there is a much greater likelyhood of dropped chains off road.
Also bigger chainrings might(?) help reduce the chances of dropping a chain due to bigger wrap....
Also 127mm vs 130mm wide isn't a big difference in angle (even when you consider that the older blocks c-c max to min tooth distance would be slightly smaller as well)