YACT: Shaky steering between 55 and 65 MPH.

[WinkOsmosis]

I have a similar problem.. but the vibration was at 65mph, 75mph, and 85mph. Nothing in between. I'm pretty sure it was because of my rear tires being like this....http://www.tortoisehead.com/tiresm.jpg

Uneven tire tread, even if this is an extreme case.

 

[KokomoGST]

Originally posted by: WinkOsmosis
I have a similar problem.. but the vibration was at 65mph, 75mph, and 85mph. Nothing in between. I'm pretty sure it was because of my rear tires being like this....http://www.tortoisehead.com/tiresm.jpg

Uneven tire tread, even if this is an extreme case.

Whoohoo! That's majorly corded!

 

[Vic]

Originally posted by: polm
I'll buy you a beer when I understand why the un--balance creates annoying vibration ONLY between the speeds of 55-65 MPH. Why not at 75 ? Why not at 15 ?

Harmonics. At lower speeds, the vibration is smaller and slower and is capable of being absorbed by the suspension. At higher speeds, the vibration becomes fast enough that it is once again capable of being harmonized by the suspension. It's the magic speed of 55-65 where it won't harmonize.

 

[ChurchOfSubgenius]

Originally posted by: polm
I still don't understand why the shaking ONLY occurs between 55 and 65....

The shaking you are feeling is what is referred to as "resonant frequency", all moving things cause vibration and at a certain frequency objects will "resonate" ................... can't explain any more right now, boss is giving me the evil eye.

 

[gunblade]

Oh I have a similar problems, however, my car shake a lot on low speed like 15 ~ 35, but on higher speed it run just as smooth as any other car.
The tires are Michelin Energy MXV4 Plus .