Originally posted by PapeteeBooh
...when I attach something on my bike with 5 bolts it is still loose after a week due to vibrations, I guess my body takes vibrations as well.
It certainly does. I'm careful about position on my bikes, consciously try to keep hands relaxed, remove them from the bar for an instant on big bumps, etc.--but nothing (not even suspension, which I don't have) could completely protect me from some of the jolts that are simply unavoidable. (Well, they're avoidable, but that would mean maintaining the streets, and that seems beyond the power of our local governments to carry out.)
As a side note, I believe I would have recovered from stomach surgery a lot quicker if I hadn't gone back to work when I did, riding buses that are almost as jolt-prone as a bike. I could feel things going on inside that were not good....