When I replaced a front tire on my 2010 Dixie Chopper the two bearings which were on the wheel fell out when I removed the wheel. I ordered replacement bearings and find that Dixie changed from two bearings to now four bearings for the wheel. Does anyone know what caused this upgrade? I've had many, many repairs on this 2010 Silver Eagle since it was purchased new and was just wondering what Dixie found to cause a change like this...