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Pretty much, it's the heavier Hollowgram crank arm (Si is the budget version of the SiSL2), but with an adaptor to allow normal chainring to be fitted.
Meaning you can fit those one piece double chainset on it instead of the adaptor + FSA chainring, despite that, it is still pretty light at 540g.
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No, they're not hollowgrams at all. They're forged cranks with a channel down the back, visible here:
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They are plain old forged cranks - think omnium like in construction that happen to fit the Si hollowgram axle.
edscoble
Brommers
Howard
@spotter
Whats up with these new Si cranks?
are they just hollowgrams with differnt branding?