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why has steering wheel vibration at more than 120km/h?

why does has my steering wheel vibration at speed more than 120km/h?I did every balance in all wheel but problem is remained.My cars life is 65000 km and my new tires is 15000km.

Public Comments

1. you either could be over revving the car or the car isn't warmed up OR even its just not ment to be pushed past 110 KM/h
2. your wheels need to be a realigned... and it could just be wind resistance on your car as well...but usually that all has to do with the alignment
3. your wheels could be out of balance,go to a tyre garage,and get your wheel alignment checked,and wheels balanced.if not,the it could be something a little more costly,like a bent track rod end on your steering rack
4. It could be one of a number of faults... ie: Worn wheel bearings.......Suspension bushes worn.......Track rod joints worn..... If it has an anti roll bar fitted, the joints on that could be worn.. Your tracking could be out.. Your shock absorbers could be faulty... Get all of these checked out.
5. could be a bent rim OR a warped brake rotor OR tye rods warn out OR belt broken in one or more tires OR front end out of alinement
6. your tie rods and ball joints are bad. Needs replacement. These things are connected the frame of the car and up to your steering wheel so you can feel a lot of vibration if there are loose and worn out. Hopefully it is just the tie rods as they are cheaper to replace than the ball joints.
7. Sounds like bad shock absorber(s) damper(s). At 120km/h or 50-55 mph harmonics take over and the wheel hop begins, traveling to steering wheel. Also check ball joints.
8. Alignment and Balancing need to be done, I have had several times. You might notice that your tire is worn out from one corner, and steering vibration at speed higher then 100-110. They are all sign of balancing and alignment. Hope it helps.