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Of course, I forget about the SRAM X1, was thinking of the more common Shimano one.
Actually as long you replace it before it cause wear and tear, quite likely a long time, I never replaced the 8 speed cassette since 2013 and the 10 speed since 2010 (dad's bike).
Abet the chain were much cheaper on those cassette making it more bearable.
I wouldn't mind the accelerated wear on the 11 speed had it not been so damn expensive.
^ Not at all Ed!
It is measuring about .65 so I guess it needs replacement immediately then, but hopefully my religious wiping (heh) will have saved the cassette from too much wear.
The biggest rear sprocket on my X1 drivetrain is definitely aluminium so I am anticipating it wearing faster than the steel ones despite being larger. No choice in where I place the chainring on these cranks, although on my 1x10 bike it's on the inside for the reasons you say.
How many chains do you think you'll get out of a cassette on the 11sp? I'd normally say after the third chain, forget about it and just ride until the whole thing is worn out, but you've had 7 chains on the same cassette? That's road or MTB?
Incidentally I just noticed the topographic map background on the SRAM website is only a couple of hours away from where I live in NZ... or is that just some clever IP-address-specific background? Can anyone else see Little Mount Peel in the bottom-right?