I just purchased a new FSA Tempo Adventure JIS crankset - 46/30 to replace the FSA Vero Compact 50/34 JIS crankset on my 2018 Cannondale Synapse Sora 9 speed as I need lower gearing.
Both are shown as FSA "Road" and should be compatible. But they are not...
On the Vero, the interface to the BB sits slightly above the plane of the inner chain ring. On the Tempo, the interface to the BB sits a few mm below the plane of the inner chain ring.
Net result is that the chain rings of the Tempo are closer in to the frame, and actually touch the chain stay so cannot be fitted.
Does anyone know if there is a way to to overcome this problem?
Maybe there is there a replacement BB that would compensate for the movement of the Tempo cranks closer in to the frame?