Originally Posted by DocRay
this will strain the wheel bearing and the trainer bearing.
A lot of the slip is from the road tire rubber over heating and sloughing off. If you are seriously using your trainer, road tires are not for this, you need to use the orange trainer-specific tire from continental.
Mine is going on two seasons and does not slip at all, with two turns of tension, even during out-of-saddle drills. In the long run, it will save you money.
I would ever recommend putting enough tension on to cause any of that strain. While not having used a Kurt - most of the other trainers that I would use I could turn about 1/8 - 1/4 of a turn more to eliminate bad slipping.
Tire choice is key though. I use the cheapest tires I can find. Mine tend to heat up quickly and then any slipping usually stops.