I have pirellis on my everyday car and they vibrate so little I've never bothered getting them balanced. My 2p is that the D's wheels account for more of the vibration modern tyres. Martin #1458 jtrealtywebspannet wrote: > To dynamically balance a tire requires puting the wheel balancing > weights in the proper position on both the inside and outside of the > wheel. If a small weight is on the outside it is permissable to switch > it to the inside but there might be a noticable vibration under some > conditions. It is best to leave them where they have to go. If it > really bothers you dab some silver paint on it. The weights compensate > for any symetrical deviations from ideal dynamic balance so when the > tire is rotating at high speed it doesn't "bounce". Some brands seem > to require more balancing then others.