I'm looking to purchase a set of aero wheels for triathlons and occasional training use. I'm leaning toward the Hed 3's. I don't like the idea of having to switch out brake pads when switching between training wheels and race wheels, if i purchased a set of H3c's. Would it be a bad idea to go with a H3C front and the aluminum rim H3 in the back? The weight savings would be 120 grams in the front, totaling 1670g, compared to 1790g for the H3 pair.