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i wouldn't trust a NW on its own to be enough security
I’m surprised.
I’ve raced very fast, rocky XC with a NW ring and a non-clutch mech and never lost the chain.
(caveat that Deore mech probably has a stronger spring than most road mechs)
miro_o-
Deore mech probably has a stronger spring than most road mechs
It's certainly a lot stronger than CeramicSpeed springs. There's probably a some chainstay length at play here too - longer stays = less angle and I guess you're probably not in the smaller cogs so much when heading downhill? I'm a shit mtber so I'm rarely adding speed downhill by pedaling. I find generally have feet planted and use gravity is enough. It's when you're changing gears that you're more likely to throw the chain.
hippy
Clutch rear mechs lose about 3 w though it appears. If your running a standard rear mech you'd probably need a front chain guide as i wouldn't trust a NW on its own to be enough security especially as most of our roads are fucked at the moment