I had been running Michelin Pilot Sports which had to be replace because of sidewall damage on 3 out of 4 tires.
I replaced them with a set of Falken ZIEX's (both the Pirelli's and Continentals I wanted were on backorder).
The tires were balanced when put on however at around 60 MPH the car has a subtle vibration which is very annoying. I don't recall this with the Pilots at all. It isnt' pulling to one side or another but just sending a vibration through the car. Is this normal for an all season tire?
What would cause this? Does the car need a front end alignment, need to rebalance the tires again or could one tire be out of round?
Possible they were not balanced correctly or and more likely with an off brand tire like yours one or more could be defective with a bad belt or out of round.
Rebalance. I am running the same tires as you with no problems and I pulled it up to 120. I went to sears they seem to have all the right equipment to get the job done right. The price is fair as well.
I guess I'll try getting them rebalanced first and see what happens.
Other than that the tires handle very well (even in light snow) and were a fraction of the price I paid for the previous Michelin Pilots.
Not too many people seem to know about this tire but it is a great value for the price (paid $88 per tire online). Just have to see how it holds up over time.
The W210 front end is extremely sensitve to tire/wheel balance followed by tire some tread patterns that will cause more pulling as the tire wears out.
For your vibration problem, since the tires are new, ensure they balanced in the "dyanamic" mode. If you asked for all the weights to be mounted on the inside of the wheel, more times than not, your wheels have been balanced in "static" mode. This is no better than using a bubble balancer.
If you really don't like weights on the outside of the wheel, you can still request a dynamic balance job with all the weights mounted on the inside. It takes a little longer for the technician, but it can be done. Basically, when the machine spins the wheel and reports where the weight(s) need to be on the outside, the tech will mount the weight on the inside of the wheel nearest to the outside edge. This is why is takes longer, the tech will need to reach inside of the wheel to stick on the weight. It also may require the tech to do a few more spins to get it right. Find a shop that is willing to take the extra time.