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According to Rotor, 3D+ in a BB30A shell need 1x11.5mm and 1x0.5mm spacers on the DS and 3x0.5mm and 2x2.5mm spacers on the NDS.
Cervelo OE cranks have the 11.5mm spacer built into the spider, so you just need to omit that.
I fitted Cervelo OE cranks to a BB30 (not A) frame and my experience matches Rotor's chart (obvs).
I got the spacers from Power2Max, but I'm not sure if that would be cost effective now.
These are the cranks I bought. If you click on "22 sold", you'll see they're receptive to an offer: I paid £125 in Nov 2015. By now I'd imagine they're even more keen to shift them...
Scilly.Suffolk
@sacredhart
Cervelo rotor bbright cranks: what do I need to do to these to make them fit bb30a?
Or is it much simpler to get standard 3d+?
Thanks