Originally Posted by
FBinNY
I wasn't thinking of rubbing within the bike, but against the yoke that supports the trainer's roller. The axle supports aren't super rigid, so when working hard the bike can rock, moving the tire along the roller. Flex hard enough and the tire moves beyond the end of the roller and rubs the supporting yoke.
Oh whoops sorry if I wasn't clear... I have two wheelsets. I noticed it on the road a few days ago and on the trainer earlier with the other wheelset/cassette