One of the main benefits I see is that the bearings are not being pushed in and out of the wheels constantly... I've noticed with previous B4's that the bearing housing in the wheel gets 'loose' and causes quite a lot of play in the front steering.
Having the bearings in the hubs like the old losi XXX is a much better way of doing it as its a lot more constant and like the previous post said it should make the bearing last longer as they're more protected from the elements.
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