Originally Posted by kabex

The CAAD8 is an "comfort"/lower level road bike unlike the 9/10 which are performance/higher level bikes.

The CAAD8 has a higher HT(iirc) and heavier frame, non-full carbon fork(iirc as well) and starts with lower components&lower price.

Originally Posted by 2ndGen

CAAD8's were introduced as detuned CAAD9's.
CAAD9's became mid-level bikes price-wise.
CAAD8's turned out to be nice bikes actually.
There's a gorgeous built-up Black C8 here.