[Closed] narrow/wide on singlespeed?

Would be of no benefit on an ss with proper tension, but if you like shiny shiny then do it

There is no benefit.

Downside is things can get a bit "cruchy" in the mud as a NW won't clear the mud off the teeth as well as a traditional tooth profile. This might not be a problem where you live but our claggy, gritty mud can make the chain sit high on the teeth, make an aweful noise and risk the chain falling off the ring or adding too much tension in the chain. Just the noise is enough to put me off it, never had any other issues though.