@balles88 , what I meant about the rear tire and rim was:
A wider tire in the rear helps prevent pinchflats, while still offering a comfortable ride. It also is less susceptible to increase in rolling resistance due to non optimal inflation pressure.
For maximum aero benefit, that wider tire would also need a wider rim. However, super wide rims are hard to find, and heavy. In the rear, aerodynamics of the wheel/tire combo matters less, so sacrificing maximum aerodynamics in order to get the benefits of a wider tire is probably a good trade off.