Push comes to shove I'd use SRM on the existing cranks
You can't, since the 9000 cranks don't have a removeable spider, which is why the SRM '9000' cranks use the old 7800 SRM-special cranks repainted to look like 9000 cranks.
Ah, I see. I just assumed they'd make it work.
@hippy started
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You can't, since the 9000 cranks don't have a removeable spider, which is why the SRM '9000' cranks use the old 7800 SRM-special cranks repainted to look like 9000 cranks.