My bike came stock with Mavic Aksium wheels. They wiegh 1855 gm. I ride anywhere from 100-250 miles per week. I do a lot of climbing and 100 mile + rides. I love riding centuries and doubles. I do not race and don't expect I ever will. Would I gain enough from wieght and aerodynamics to be worth the cost of better wheels? What would I gain? 5% easier, faster???? I would be looking at wheels in the 1450 gm range.