Clutch rear mechs lose about 3 w though it appears. If your running a standard rear mech you'd probably need a front chain guide as i wouldn't trust a NW on its own to be enough security especially as most of our roads are fucked at the moment
That doesn't bode well then. I'd only bother changing to NW if I could remove the FD guide I've got and I'm not going to swap my RD (DA + CeramicSpeed jockeys).
Clutch rear mechs lose about 3 w though it appears. If your running a standard rear mech you'd probably need a front chain guide as i wouldn't trust a NW on its own to be enough security especially as most of our roads are fucked at the moment