I bought a new belt and 2 new rollers as mine were noisy. The bearings were shot no doubt about it. After installing them, the noise actually increased! The belt was incredibly tight. I put the old belt back on and it the noise went back down. I didn't have that problem a few years back when I replaced it at 60k miles. My car is now 120k.
Has anyone experienced new belts being too tight? I might go use a different manufacturer now.