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oh .. would you be happy with 46/30? http://www.bike24.com/1.php?content=8;product=209251;menu=1000,4,29;mid%5B77%5D=1
You could even do it with your current Rotor Crankset: http://www.velotechservices.co.uk/shop/vclose2.asp?prd=224549&cat=373
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No powermeter and proprietary bcd. So that's a no and a no.
I looked at that Rotor and again, no P2M.
Also looked at Alba cranks but same issues as your first link
https://www.lfgss.com/conversations/231362/?offset=225
I have that already. I want lower gearing, hence all this talk of Wolfteeth and SRAM cassettes.