How does equipment influences in my ride speed ?


I’ve been using Zwift for almost 3 weeks, so far so good. 
However I have the following question, regarding the game internals:

Does equipment influences the ride speed ? For instance if I am riding at 3 watts/kg will the speed I see in the game be the same if I choose a carbon frame or a steel one ? Or being with or without helmet ? Or having deep rims wheels vs flat ones ? 

As in real life does things do influence (and a lot in some cases) I was wondering if they have been considered in the game and how. 



Really great blog here