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Yeah, CAAD12 and recent Synapse are BB30A, which are 5mm wider than BB30.
http://www.cannondale.com/en/International/Innovation/bb30-bb30a.aspx
This seems to back up what you've seen...'Cannondale Hollowgram BB30A cranks will work on both BB30 (68mm BB width) and BB30A (73mm bb width) by changing the non-drive side spacers.'
Give Sigma Sport a call as they're a Cannondale dealer. The workshop were really helpful when sitting there swearing at my frameset didn't fix anything. Swift Cycles are also a Cannondale Dealer (I'm assuming you're in London)
Or this might be promising
http://www.cannondalespares.com/Cannondale-Hollowgram-Chainset-Road-Spacer-Kit--KP483_/product_detail/3-42959
duncs
I don’t know honestly. They weren’t fitted to the 12, just pushed in for the picture a while ago but the lad I bought them off pulled them from his caad12 so I’d guess so.
Can’t believe I can’t find a definitive answer on what bits you need to fit a Cannondale crank into a Cannondale frame. Any diagrams just point at it and say “non drive side spacer”. Yeah cool, what is it and where the fuck can I get it from?!