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How do you mean? I’ve just kept the chain oiled and cleaned, (the bike is always stored indoors) and haven’t had to do anything else: it runs smooth as you could ask for.
Why did you need to do anything to the cables.
PGD-
After some time the cables needed to be replaced. I think one frayed near one of the "barrel" fitments in the rear (that sits the cables into their positions on the hub.
Luckily I didn't lose either of the 2 "barrels" when this happened.
I think some of the nuvinci hubs have a slightly different cabling method (one involves measuring a length of cable excess from the housing to position the barrel)
Mine didn't necessarily need measuring (had to do a bit of trial and error with cable length as I didn't want barrel adjusters wound out)
psg1ben
Dunno, I did the cables on mine recently. Was a touch fiddly.