what is the difference between a comp and a standard version of the same bike model

[coriace]

A question I've been asking is what is the difference between say a specialized roubaix comp and a specialized roubaix elite is the difference related to the size of the frame or is it quality and design

 

[Norm]

Neither.

The frames are the same, it is the components which change.

 

[Rob3rt]

Paint job and the component choice most likely. Maybe some geometry nuances depending on the manufacturer.