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[gtabmwdriver2011]

I purchased my 328i xDrive (with Sport package, in case this is relevant to my question) in December. I had the dealer install my winter tires (on rims) prior to delivery, so I never drove the car on the OEM tires. Yesterday, I swapped out the winters for the summer tires. I am finding the handling "squirelly" (that is the best word I can come up with to describe it). The winter tires tracked perfectly over all surfaces (they were non RFT, in case it matters). The summer tires feel like there is a marble under the contact patch for each tire. I have checked the inflation pressures and they are spot on. I don't think the allignment is off because the car handled fine just prior to the tires being swapped.

Any thoughts/suggestions?

In case it matters, the summer tires that came with the car are Bridgestone Potenza RE051.

[Want]

google tram-lining. is that what you meant?

[CHCCubs]

Could also be temperature related. I assume you live in the Toronto area, and I know the temperatures haven't been all that warm lately. Generally summer tires have reduced grip below 7C.

[gtabmwdriver2011]

Thanks for the responses. Some of what I am perceiving is definitely tramlining, but I still feel like the steering gets very light at times (like there is a marble under the tire is the best way I can describe it). This never happened with my winter tires.

And yes, I am in the GTA. I guess that means I jumped the gun on installing my summer tires.

[MazdaFan]

RFTs sometime loose traction on uneven pavement. This is due to stiff side wall.

[VMRWheels]

Tire compounds and tread design will play a large factor in tramlining and overall grip. What pressures do you have tires set at the moment?

-Charles@VMRWheels

[gtabmwdriver2011]

I used the recommended pressures for my tire sizes for up to 160 km/h (in the manual): 32 F, 33 R

[michaelalex17]

i recommend you look at my thread

http://www.e90post.com/forums/showthread.php?t=486583