Product review (1 stars): Not made by LG and don't work on LG dryers
The rollers with the red hub are not made by LG. Even though the Amazon listing shows the specific LG dryer models which these are supposed to be compatible with, they will not work. I ordered a set of four and replaced all, dryer's banging sounds were made worse. Contacted the seller who advised that these were not for LG dryers (and didn't accept a return because the rollers were now "used"). I ended up buying one original roller to replace the bad roller I had, and installed the other three I pulled - problem fixed.

My suspicion: the red hub rollers are larger in diameter than the original LG rollers, and made from a much harder rubber. LG dryer's steel drum is probably bouncing on the hard rollers, hence the banging sounds. The Blue-hub roller is softer and works perfectly!