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Just Re-engineered 2006 M35x
For those who may have had similar problems I have had, this may be of help.
A few months after buying my used M35x, I started feeling a vibration when I get to a particular speed. I did wheel balancing with no luck, changed brake discs, changed wheels and serviced the caliper. The problem went away. About three months ago, I noted that the vibration was back and upon examination discovered that the tires had issues and when I tried to do the balancing, discovered yet again that the wheels I changed to had warped again and so could not be balanced. I was able to get a new set of 18" wheels on loan from my dealer and bought new tires. The problem instantly went away. I then embarked on a trip and on my return journey I lost one of the tires and when I removed the wheel to mount the spare tyre, I discovered that the wheel had warped and the tyre tore open. To say I was shocked, would be an understatement given the fact that it was a tiny porthole, which I avoided bumping into, that ended up warping the wheel and tearing the tyre. I had always known that the OEM wheel/tire size setup was too flat and would therefore allow impacts to get to the wheels, which was why they always end up getting warped. Unfortunately, I lost the spare tire too and was stranded. All effort to get replacement tires and wheels proved abortive as the tires and wheels were unavailable. It took the help of a very dear friend who had to drive over 100 km to get me the wheels and tires I originally had in the car.
After the very sad experience I resolved to change the wheels and tires from the OEM setup of 245/45/R18 to a setup that would be more readily available and tires with enough sidewalls to absorb impacts without passing same to the wheels. After an extensive research, I settled for 215/65/R16 which gave me 27% increase in the sidewalls, less weight and 4mm more fill up of the wheel well. The only draw back, was that I had to file a bit off the caliper to prevent the it from rubbing on the inside of the wheels. The good thing about this setup is that the tires and wheels are more readily available and cheaper too! Neither does it adversely affect the looks of the car!
This setup has increased the ground clearance marginally, although almost not noticeable. The ride is smooth, less harsh and handling is not compromised at all. I now called the car 'My re-engineered M' because I now drive it more often than in the past and enjoying every bit of it!
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