Alright here's my problem. I recently put style 32's (originally found on the e39 540's)on my e34. The rear tires are 255 and are the tires that came on the rims when I bought them. The front tires are brand new and are 235. Even at slow speeds I hear a kind of "whining or whurring" noise. I can't really explain the noise. Could this be a rubbing issue, and if so, what would the tires be rubbing on??? I had the wheels balanced on a Hunter Roadforce machine and I thought that would cure the noise and the slight vibration at about 65 mph. Every once in a while, I hear a "ping". The ping noise is somewhat random and happens even after I am outside of the car .(About 2 minutes after turning the car off.) I also have hubcentric rings installed. I know you guys have 255's in the rear so what could the problem be??? Should I replace the rear tires??? I read all of the other threads about a slight shimmy and I ruled out the possibility of worn parts because my car only has 55k miles and the problem NEVER existed before I put the new rims on. BicycleFreak if you are out there give me a hand. I know you had the same rims on your green 540!! Any suggestions would be greatly appreciated.