I am currently riding Rolf vector comp 700c road clinchers and I am having some problems! After about every one hundred miles I have a spoke that keeps loosening up and I am getting tired of re-truing the wheel. I went out on a 20 mile ride and when I left everything was true and tensioned but when I got home to check everything over the wheel would not roll through the calipers by itself without being forced. This is about the 4th time this has happened. Is there anything to put on the spoke nipples to keep from coming loose! I weigh 200lbs and have very strong legs but I dont see this as a problem. Maybe I need to switch to open pros? Any help is appreciated.