Recently developed a wobble at 55-60mph goes away at 60+mph

Car drives straight if i let go of the wheel, alignment appears okay

Turning has no effect on the wobble.


Wheels have been balances recently.

The wobble is visible if I let go of the steering wheel
it slightly moves right to left about 4 times per second.

Where should I begin?

 

Have you had something done to the car? I had the same thing in my previous BMW after putting on two new front tires. Dealer couldn't straighten it out after a couple attempts at re-balance so I took one off at a time and replaced with my spare. Through process of elimination I found the offending wheel, took it into my local Firestone and had them balance the tire. Problem solved.

Could also be bent rim or a tire flaw. If it was me I would use the same method as before, process of elimination, to determine the tire that is giving you an issue so it can be assessed.

 

I had one of the rear wheels repaired with an internal plug, don't know why that would affect the front of the car though..

 

A rear plug wouldn't affect the front. If the tire shop used stick on weights, you probably just threw one. Take it back and make sure they clean the wheel where the weight is going or it'll happen again.

 

It could be any of a number of things including a slightly bent rim and the like. Road force balancing is one of the best ways to identify tire/wheel troubles. It is pretty low cost and the tech can pin point exactly what is going on with those rolling parts.

I have a slightly bent 20" that gives a wobble in the steering at 60mph, we found that by running the tires at a slightly lower pressure it smoothed right out. Of course lower pressures have a negative effect on tire life and temperature so the only real answer for a bent rim is to have it straightened.

 

wheel weight fell off on front left tire.

will rebalance tomorrow.

thanks everyone