If you are putting a lot of power through the rear axle or use like to corner hard then you might take advantage of these double hub bearings.

The only thing that stops the standard hubs flexing is the half shaft which puts a lot of strain on the shaft itself and the small original single bearing. These are designed to work with either drum or disc brakes on the rear and both the knock on or bolt on wheels and use the highest grade bearings for long life and reliability.