Can I use an 1/8" chain on an old 8speed I'm converting to single speed?
Yes, you can use an 1/8&quot; chain instead of 3/32&quot;, is the other way around you can't go.
However, it may have problems going through your deraileur, but we can't say for sure. For normal single speed or fixies that's not a concern.
I would use a normal 8 speed chain anyway, it'll probably be cheaper. Only get an 1/8&quot; chain if you get track chainrings, or you want the colored chains, which I've only seen in 1/8&quot; size.