I recently acquired a Cervelo Edition Rotor Crankset, in the possibly incorrect belief that it would fit my Felt F1 BB30 BB, with the supplied spacers. It doesn't fit (too wide) and I am a bit bemused as my mate has the 3D+ on his frame without issue.

Any illuminating advice gratefully appreciated...

You just need an additional spacer (that's supplied with the cranks normally, but not OEM as it's not needed on Cervelo).

Contact your LBS / Rotor dealer, and you'll be sorted.

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Don't be alarmed.

Try Active Cycles 01434 632 950 like you I got a Cervelo Rotor from them and they fitted it to my Cinelli Strato BB30 without issue, but its all in the spacers. They are a Cervelo dealer so should know and have what you need...