..and switching the Si chainset to force22 only saves you 30g (690 vs 720) so it isnt worth it imo if unless you are going for matching sram groupset.
Force looks nicer than the third tier si crank :)
Both the force bb30ish and the Red bb30 crank will fit both bb30 and bb30a frames, although with the later and the red bb30 crank that collet would need to come off and the chain line might be a few mms out.
@Howard started
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..and switching the Si chainset to force22 only saves you 30g (690 vs 720) so it isnt worth it imo if unless you are going for matching sram groupset.