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6 Series
The BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 11-04-2012, 03:32 PM
seans4976 seans4976 is offline
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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.
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  #2  
Old 11-04-2012, 03:40 PM
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gregb gregb is offline
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You might switch to non-RFT's as they have a little softer sidewalls.
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Old 11-04-2012, 03:48 PM
seans4976 seans4976 is offline
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Are those OEM m6 wheels or replicas on your car, and are you referring to the tires when you say non-RFT'S?
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  #4  
Old 11-04-2012, 04:38 PM
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Mulchman Mulchman is offline
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Quote:
Originally Posted by seans4976 View Post
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.
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Last edited by Mulchman; 11-04-2012 at 04:40 PM.
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  #5  
Old 11-04-2012, 04:56 PM
HerbP HerbP is offline
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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.
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Old 11-04-2012, 05:08 PM
seans4976 seans4976 is offline
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Mein Auto: 2005 BMW 645 coupe
Aftermarket wheels

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?
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Old 11-05-2012, 02:44 AM
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Mulchman Mulchman is offline
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Originally Posted by HerbP View Post
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.
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Old 11-05-2012, 06:24 AM
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roseng roseng is offline
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Quote:
Originally Posted by seans4976 View Post
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.
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Old 11-05-2012, 08:19 AM
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gregb gregb is offline
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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.
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'07 650i vert, beige/jet black, sports & cold weather pkgs, comfort access, logic 7, sat radio, Miro M6 wheels (with Michelin super sports), M6 spare tire, tint, windscreen, triple resonator delete, m-tec v3 AE's bulbs, corner bulb delete and m-tec fogs
'11 Acura MDX Advance with Entertainment pkg for wife - no mod's '04 Acura TSX (daughter) and '12 VW GTI - Autobahn (son)
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  #10  
Old 11-07-2012, 04:33 PM
JlMMY JlMMY is offline
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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?
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