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Ah no worries, thanks for the clarification.
So in theory if the manufacturer says it is a 140mm fork then there should be no way I can get a 160mm rotor to fit.
The fact that I can mount a caliper with a 160mm rotor would thus dictate it is a 160mm fork and they're wrong / fobbing me off.
Thanks for the reassurance about lock ring clearance! For the sake of £8.99 I'll probably get the slimmer lockring but good to know it isn't an issue!
Oh crap, sorry I thought you had flat mount. If it's the post mount then the mounts dictate position. If the manufacturer specs 140 then go with 140. I wouldn't stress about clearance at the lock ring too much, that is going to be the most rigid part of the fork, I don't think it's going to flex enough to rub.