Probably worn steering and/or suspension parts. Have the front end safety inspected.
At moderate speeds, yes. For higher speeds or tight cornering, you might be causing a problem.
yes they would. you my be able to reduce the problem by having the wheels computer balanced. you may be able to have the wheels straightend or replaced
You can't convert between seconds, and meters/second. If you have a problem that involves speeds, use the formula: distance = speed x time.
Tires/wheels out of balance?
Alignment
Despite repeated balancing, my 2004 and 2007 Ford Focus (Foci?) would shimmy at speeds above 65. In both instances the problem was rectified by the installation of new sway bar end links (Google it). Any decent auto parts store will have them for about $25 each (you need 2) and most DIYers will have the metric sockets and wrenches necessary to install.
Yes, bad tie rods can cause shimmy in a vehicle. Tie rods are crucial components of the steering system, and if they are worn or damaged, they can lead to improper alignment and instability in the steering. This instability can result in a shaking or shimmying sensation, especially at higher speeds. It's important to address any issues with tie rods promptly to ensure safe driving and proper vehicle handling.
Most likely its your tires. Could just need balanced. Or you might have uneven wear making it shimmy.
Despite repeated balancing, my 2004 and 2007 Ford Focus (Foci?) would shimmy at speeds above 65. In both instances the problem was rectified by the installation of new sway bar end links (Google it). Any decent auto parts store will have them for about $25 each (you need 2) and most DIYers will have the metric sockets and wrenches necessary to install.
why is my 1991 Mazda truck surging at higher speeds
Switch the front wheels to the rear and try it; if the vibration has changed at all you have a tire/wheel problem. It is not uncommon for a shop to miss this problem. Most vibrations like yours ARE tire/whhel problems. sounds like u-joints
Higher g's produced at higher speeds are harder to survive.