Vibration at a particular speed only, Why ?

[beautyland]

I have replaced shocks on my 95 525I. It is vibrating on 55 to 60 mph. Other than that ride is superb. I have replaced pretty much every thing on struts except housing, Mount and spring.
I am thinking of wheel balancing. I will get that done professionally and see the difference. Alignment, ...huh .

Any ideas, why it is doing that? Did any body had that problem before?

Thanks

[///M Power]

Yeah get the alignment.

Does the shaking occur in acceleration? or while braking? What if you run constant at that speed?

Manual transmission?

[silverlea]

Very sensitive suspension setup in these cars with lots of aluminium bits underneath.A wheel out of balance,or a flat spot in just one tyre will transmit all the way to your steering wheel.Thats why I changed to high quality tyres and that did help a great deal.(17inch Pirelli p6000) I also had problems similar to yours with my E39 540i. Some tyres do balance up finer than others.How many miles do you have on your present tyres ?
Good Luck.

Silverlea.

[beautyland]

I want to get the tires balanced and will go for Alignment. Hope this will solve the problems. Tires are good. Car has 120k miles, Auto, recent brake service. This happens during acceleration only. Thanks for all the help.

[Torque]

Thrust arms.

[beautyland]

This is what I have come up with so far.
Front wheels are way off balance. One got balanced pretty well. Other rim got bent (as per techie). So we put that on rear for now. Started shopping for an old rim. Hoping this will solve the problem. If still vibrating, I will go for wheel alignment and take a look at thrust arms.

[silverlea]

If rim bent etc,the problem lays rite there.Car will shake to bits.Thrust arms will have no affect whatsoever on the vibration in your steering,nor will a wheel alignment.the wheel alignment is always good but only gets all the tyres wearing evenly.
Hope you get there in the end.

Cher,
Silverlea.

[beautyland]

This solved the problem. Rides very nice. Thanks for all the support and help.