Chain keeps falling off chainring
Chainrings meant for a derailleur setup are designed to facilitate the chain's movement from ring to ring.
The derailleur itself keeps the chain from going too far.
Conversely, 1x-specific chainrings are designed with chain retention as a top priority.
If you're not keen to replace the crankset and chainrings, I would get a retention device of some sort.
There are very simple &amp; lightweight &quot;dogtooth&quot; chain keepers that prevent the rings from falling towards the frame.
In the off-road cycling world, which is approaching universal adoption of 1x drivetrains in new bikes, there are chain keepers that essentially look like little tiny derailleurs.
One of those would be your next try if a dogtooth keeper doesn't cut it.
However, fitting one of these with a double crankset in play may prove tricky (I have not tried it).