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i had a polymer cable snap in the shifter on me yesterday (though previously steel ones have done the same to me)
the polymer ones are not cheap - £17 rrp. PTFE a little cheaper. as its for the daily use commuter bike i think its probably worth investing in the polymer ones again (but £17 for a fucking cable...)
I've just installed the polymer on my new bike and they're amazing, don't know how much difference the SP41 outer makes, but clean, smooth shifts are nice compared to the tortuous sloppy shifts on my old 10 speed 105 with steel cables.