Originally Posted by
kc27
...Shimano Nexus 8 speed, 120 mm wide...examine the one piece cranks to see if they can be modified with spacers to be in line with the new rear hub. And that's only if the stock chainwheels would even be compatible with the sprocket on the new hub.
I think it's a typo, never seen a 120mm Nexus 8, they're usually 132mm.
I adjust the chainline on one piece cranks with spacers, it's easy to do. As for the chain, sometimes I have to use 1/8" because cool sprockets for one piece cranks are usually 1/8". Here's a bike I adjusted the chainline to match my SA 5-speed hub, it's within a millimeter of perfect: