Can I use a chainring designed for 6/7/8 speed with a single speed, 1/8" chain?
The rear wheel only has a single cog - no derailleurs.
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Yes. You can use a 1/8" chain on a 7 speed freewheel. I'm running one right now on an electric folding 20x4 fat bike. It will work. I put a larger 60 tooth chain ring on front so I could more easily keep up pedalling at 20 to 28 mph (32-48 km/h).
I changed out the crank arms and had to use 2 chains put together to make it long enough due to the large chain ring, but yes a 1/8" chain Will work on a 7 speed freewheel and derailleur.