just changed 4pcs. uc6 205/50r16 at 265 each. came from falken 914 (quiet only if road in good condition). in terms of quietness, it is quieter,  quiet even in rough road condition. haven't try high speed yet coz my car suddenly became a ball, bouncing all the way to office today, until i wanna vomit. speed was below 100. half way went into petro station to reduce air pressure to 29 but still bouncing. Does anyone know what happen?