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They are. The power meter spider is an integrated unit with the chainrings, and you pay to unlock the firmware in the power meter. When the chainrings need replacing, you return the whole thing to SRAM for a half-price replacement.
Another reason not to buy SRAM gear. As if there weren't enough already.
Brommers-
On the sigma website the two models look different is all...
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They are. The power meter spider is an integrated unit with the chainrings, and you pay to unlock the firmware in the power meter. When the chainrings need replacing, you return the whole thing to SRAM for a half-price replacement.
In the moden enlightened period of waste reduction this really irks me.
GoatandTricycle
skinny
Surely the electronics aren’t in it!?