This Sigeyi AXO Cannondale Road Power Meter is compatible with all models of Cannondale’s Hollowgram cranks: SI, SISL, and SISL2. It also fits the Cannondale ONE crankset. The power meter comes in a standard BCD size of 110×5. If your Cannondale crankset currently uses this size BCD, you should be able to use your existing chainring on the power meter.
However, some Cannondale cranksets have a larger, 120 BCD. In this case, you can still install the Sigeyi power meter on your Cannondale road crankset, but you would need to purchase new 110×5 chainrings to use with it. We usually recommend Praxis chainrings with the Sigeyi Cannondale power meter, however we have several other brands that will work.