I bought a 2010 specialized Rockhopper comp disc in November and the bearrings in my rear hub went out, so I took it to the LBS that I bought it from and they replaced both front and rear wheels and hubs fir free. They said that they upgraded me fir free into the specialzed stout hubs. Are these an upgrade from the factory hub? The new rims are Alex seamless double wall. Thanks for Amy help. Just want to make sure the bike shop isn't taking advantage of me because I don't know anything about bikes.