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Re: 19 inch rims=steering vibrations? (archive)

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Posted by Bob ///M3 on June 20, 2000 at 20:06:18:

In Reply to: 19 inch rims=steering vibrations? posted by Curious on June 20, 2000 at 19:31:28:

I think you'll find a real low profile tire such as a 19" is more likely to produce vibrations than a smaller size (diameter wheel) with more profile. Also, all high performance tires are likely to flat spot due to the weight being on the tires in one spot (footprint) when parked for a while. And since the sidewall is much shorter there is less cushion to take this flat spot "feeling" out therefore you are more likely to feel it in the steering wheel with vibration.

The vibration will usually go away after driving the car for a while. It will go away sooner if the weather is warm and the speed traveled is higher simply because you are making the tire become round again. Also, laterally flexing the tire will help the flat spot go away sooner too I've found.

All the above is assuming you don't have a problem with the balance of the wheel and tire combination! Sometimes balancing a tire AND the wheel can be a real pain. I've always wanted my front tires and wheels to first be balanced on a high quality machine and then be spun balanced on the car to remove any hint of vibration. If you've never had this done or seen it done it's amazing what the added rotor weight, etc can do to upset a perfectly balanced tire and wheel when done on a machine. Putting it on the car can really mess up the balance!

One last thing; once I get everything perfect on the car, if I ever pull the wheels off I will mark the rotors with high heat paint so I know exactly how the wheel (valve stem matches to paint mark) goes back on the hub/lugs so as not to mess up the perfect balance because of rotating the wheel off axis. I want it back on the hub/lugs exactly like it was spun (balanced) on the car when it was balanced to my satisfaction with no vibration.

I don't have 19" tires/wheels on my M3 but I have had them on another car and this is what I've learned. I hope this may help with your vibration problem or at least give you something to think about.

Bob ///M3

: please post.




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