I have the MXM4 Michelin's in 17's on my car I am wondering if the pressure is way low or way high. Either that or they are real squirmy when new. I have less than 300 miles on my car. Only driven it 3 or 4 times so far Mike iPhone
I disagree with your reasoning for twitchy behavior. If if you stiffen the sidewall then the tire will be more responsive. That means it is more responsive to steering input as well as road-induced input. I have not experienced this issue with all 6 of the tires I've tried. It was only real noticeable with a few, my present AVID Ascends included. My GenIII just seems more twitchy and likely to trampling than my GenII. Even at 60psi my GenII with Integritys wasn't as twitchy as my GenIII with AVIDs at 48psi.
Assuming you are correct, and assuming we have both driven long enough to tell twitchy from not twitchy, why do you and a few other Gen3 owners have this problem and most of us do not? I am not ready to chalk it up to tires or tire pressures yet. Are you using 215/45-17 tires on your Gen3? I noticed on another thread that all of the people reporting poor tracking were driving Prius II through IV versions and none of us with Prius V (five) had noticed it. Could it be that the different suspension components discovered by Thai, quicker steering ratio, and different steering motor of the Prius V make the car more stable?
My definition of twitchy is the car darts back and forth without any steering input. Steering input can exacerbate this issue. I do not notice this with the 215/45/17s. It is noticeable with the 195/65/15s, particularly the Ascends. I should try running higher pressure again now that they are fully broken in and see if the problem still exists.
Be sure you post how that works out. This, for me at least, is an interesting problem and it crops up from time to time on here. I know from my Gen2 that it can be frustrating and even dangerous so it would be nice if we could pin it down.
