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None if you leave the front derailleur on the bike (assuming there is already one on the bike)
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You might be OK if there's no mud or rocks, you have quite a close ratio cassette, short cage derailleur and the B-screw is wound pretty much fully in. I wouldn't bother without a chainguide/catcher though.
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Depends on the riding you do, no?
I have the same setup on the commuter and never dropped the chain once, but if you are riding a lot of rough offroad, jumps and such it might come out, but not at every corner I'd say
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I've been riding 1x10 shimano with NW chainring and no clutch. Mostly commuting but occasional light offroading (pootling around Epping Forest with a kid on the back type of stuff). Haven't dropped a chain, and had forgotten that it might even be something I might worry about.
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1x8 shimano, no NW chainring, no clutch mech, friction shift, dropped once a year on average with daily use and hammering around town
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Running 1x9 too, no catcher or guide, never had anything happen.
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1x10. Wolftooth NW with a Deore 9sp shadow mech (no clutch). Hammered down long big-gravel and rutted descents I’ll get some chain slap but that’s the least of my worries in the moment. If the frame was carbon or expensive I might care.
The chain is never coming off unless there is massive amounts silty mud stuck on the drivetrain (which has happened). The gloopy chain is then unable to sit down onto the ring. I’m not even sure a clutch would be any better there - it could make things far worse by just binding.
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I rode the whole ridgeway with that set up & never dropped a chain
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@elswick
What's the likelihood of my chain coming off on 1x9 shimano with NW chainring but no clutch mech?