I am not sure what I could be doing wrong, but I seem to continuously have issues with bearings loosening up after using them on the computrainer. It isn't just one wheelset either, my powertap will now make wheelset number 3 and it is cartridge bearings. I am not tightening it down too much infact the bike actually has a little play in the stand, also the wheel slips on ocassion if I am on a steep grade and apply load, so I don't know what is going on. Any thoughts?