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like mike said, I too have no vibration at speeds up to 100. RX8 is a smooth driving car as with the other newer mazdas (maybe cuz of their suspension setups?).
I had even smaller tires on my Celica (215/40/19) and you can feel every nook and cranny on the road. RX8 is smooth as silk, but if you do not torque your wheels correctly, you will get vibration at higher speeds due to your wheel 'coming loose' for lack of a better term.
__________________ 03 EVOLUTION VIII NOW!
04 RX-8 6speed SOLD!
Mine is smooth as silk, not a vibration to be found. All I can say is Happy Day!!
And that is high praise to Mazda and the RX-8 in particular. I've been plagued with trouble and have rarely been satisfied with virtually every car I've owned in the last 20 years due to persistent, and seemingly uncorrectable minor vibrations at various speeds (mostly FWD Japanese vehicles). All manner of fixing rarely changes the problem. I chalk it up to inferior suspensions, but who knows?