Suspension question

I have a 2005 BMW 645 coupe and am not happy with how stiff the ride is. What are my options to soften up the ride.

You might switch to non-RFT's as they have a little softer sidewalls.

Are those OEM m6 wheels or replicas on your car, and are you referring to the tires when you say non-RFT'S?

Originally Posted by seans4976

Are those OEM m6 wheels or replicas on your car, and are you referring to the tires when you say non-RFT'S?

RFT = Run Flat Tires

Stay out of Sport Mode.

Take the Run Flats off & you will have a softer ride. You will not have a spare, but most of us don't. I really don't think the sport mode will affect most of the 6 series suspension, maybe the M6's.

I have a set of replica 19 inch M6 wheels on my 2005 645 coupe and I had to put hub centrix pieces on to make the vibrating go away. After I put the hub centrix pieces on I still have a vibration.

Any suggestions?

Originally Posted by HerbP

Take the Run Flats off & you will have a softer ride. You will not have a spare, but most of us don't. I really don't think the sport mode will affect most of the 6 series suspension, maybe the M6's.

Sport mode make for a much stiffer ride to keep the car flatter for cornering.

Originally Posted by seans4976

I have a 2005 BMW 645 coupe and am not happy with how stiff the ride is. What are my options to soften up the ride.

I felt the same way. When I changed to NRFs it was like getting a new car. I went with Hankook V12s but there are many good choices. Give it a try.

Seans - I'm running the Miro replica M6 wheels which I got in a swap with another six owner who wanted to go back to stock for tradein. I had the same issue with a little vibration even after the hub-centric rings so I took it to a good custom tire/wheel shop that performed "on-car" high speed balancing, which completely fixed it the past couple of years. This shop now gets my business and I run non-RFT Michelin pilot super sports. Good luck.

I also run the Miro M6 style wheels and have experienced the vibration. For me, the solution was an alignment. My rear tires where wearing out on the inside edge. I had two alignments done within a few months of each other. The indie shop aligned it but the vibration was still there. I got the wheels on and had it balanced twice, attempting to smooth it out. I had to keep searching for the solution. The wheel alignment, from the BMW dealer, did the trick. They charged $169 verse the indie who charged $120. I have no issues now. Talk about temperamental?