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I emphasised I really do.
While Park Tools may not be the most accurate, it's always best to replace at .5 as the cassette and chainring won't be worn out at that point.
At .75 is when you need to replace the cassette, luckily chainring are the least of your concern due to the sheer size of it meaning less wear.
I also used a Rohloff cassette wear tool that helped me determined whether the cassette is O.K. or too far gone to be saved.
I emphasised as I replaced my 11 speed chain so far, 7 time this year alone ( a lots compare to my 8 speed chain which is usually once a years, maybe 15 months).
edscoble
^^ mm well you're not making it easy for me to decide.
I don't know how many Ks I have ridden, but on my 1x10 bike, 2-3 muddy MTB rides week for about a year and the chain just about needs first replacement according to Park wear indicator tool (although I do wipe it down after every ride).
My 1x11, that's too new to measure, but apparently needs replacing at the .50 mark rather than .75 mark as recommended by Park. And because the big rear sprockets are alu they'll wear quicker, too.
Now I have heard that stainless chainrings not only last longer than alu ones, but because they don't create as much abrasive detritus from their own decomposition, the rest of the drivetrain lasts longer too. My 1x10 bike has a stainless ring.
But you could spend your whole life worrying about these things rather than actually riding. I think I will just get the bike and see how I like it, Octalink cranks and all, it's only a few hundred quid at the end of the day.