Originally Posted by merlinextraligh
Turning the tension up a notch is going to put more strain on the wheel bearings than the weight of your butt pushing down on the road? Seems unlikely that the stress the wheel bearings get on the trainer, where the wheel is not supporting the weight of the bike and rider, is higher than the bearings see riding on the road.
But the trainer bearing is not designed for that, it's in the manuals.
Also, the wheel is fixed and all forces are beared by the hub only, not distributed throughout the frame as on the road.