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I have the chain come off on my singlespeed MTB three times in the last few weeks. The first two times I thought maybe some random trail detritus had derailed it as I was pedalling down some narrow singletrack but then today it came off after a landing a couple of (not enormous) drops.
The chainring, chain and sprocket only have about 500 miles on them, the chain tension is good (not a lot of slack at all) and the chainline is correct. The chainring is a narrow wide Works Components one but the sprocket is a Gusset 6 bolt disc mount one because I'm running a Gusset XD adaptor and an X01 chain because that's meant to wear slower than most. It's always the rear sprocket that loses the chain.
So my thinking is I need a better rear sprocket (this one has quite thin shallow teeth) and to get that I need to swap to an HG freehub. The wheels are DT Swiss XM1700 from 2023's CRC demise sale. Have I missed anything? Any suggestions for an 18t that'll keep the chain on and allow me to ignore my drivetrain for a long time (which is surely the whole point of singlespeed?!)