Our new factory will be constructing the wheels aerodynamically equivalent to our first generation wheels. The FLO 60 and the FLO 90 are have nearly identical aero benefits with a 3 gram (on average) difference. The FLO 90 will make a great front and rear wheel. I will say that our FLO DISC shape was based off of our FLO 90. This means that if you put a wheel cover on it, you will more than likely experience similar aero benefits. Meaning you may be able to experience negative drag with a wheel cover ,