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I've had a mixture of Si / SiSL2 cranks on all the Cannondale bikes I've owned in the last 7 years and have no concerns whatsoever with the crank arms cracking.
BB creaking on the other hand is something that does occur but can be dealt with with mainly decent maintenance and regular replacement of bearings when needed. There are other solutions as well such as loctite for the ones with PF30 cups and then using a convertor if you want to run another crankset.
Thanks all. The people reporting cracks weren’t abusing them from what I gather.... just riding their bikes.
Yes, have heard about tyre clearance. Some people can’t get 25mm tyres to fit depending on tyre/rim combo.
Will have to think carefully