I am new to rollers this year and so far I am liking them quite a bit. I bought a set of Travel Trac's when they went on sale and so far so good. The one thing I am noticing and I'm not sure if it is me or the rollers or my bikes, but I get a pretty steady whump-whump when I am on them. I at first thought it was the wheels on my older Cannondale which could probably use some attention. Now I'm not so sure since I just put together another bike and the wheels on that seem to be really smooth and round and yet I still get the same whump-whump. Is it me, the rollers, or do I just HTFU?