Vibrations after tire rotation, what is the cause?

[sanioll]

I recently grabbed new goodyear tires. On stock wheels, all balanced, full alignment. At high speed/low speed, smooth as butter.

Now after 4000 miles I've decided to do a tire rotation. FSM says back to front, and front crossed to back. I have rotated the tires myself, everything to spec, lug nuts torqued properly. Unfortunately I am getting vibrations between 55mph-65mph on the steering wheel.

Tires are in perfect condition, what could be the cause?? pressure set to 32psi as before.

Car is 1992 240sx SE, 125,000 miles, S13 chassis, manual gearbox.

[JeromeS13]

Tires out of balance or bent wheel or out of round tire.

[sanioll]

Tires out of balance or bent wheel or out of round tire.

Tires out of balance?? strong cause

wheel is not bent.

Tire out of its roundness. Yes I did lock up the front tires recently(momentarily), but they are now sitting on the back.

Steering wheel shakes right and left, small movements.

Two options I have:

take it back to goodyear and balance all tires. No charge, loyal customer.

or put the tires back in their origional locations.

I'll just change them back. I hate waiting there. Plus whatever is on the rear is going to die quicker than the front anyways.

[XxBLiNdxX]

MOst likely your alignment is off. BEfore you rotated the tires there mmight of been an uneven wear and the alignment was used to it. YOu rotated the tires and now the alignemtn is off. I'm just guessing but from personal experience that's what it would be and that's what they will probably tell you at goodyear

[JeromeS13]

MOst likely your alignment is off. BEfore you rotated the tires there mmight of been an uneven wear and the alignment was used to it. YOu rotated the tires and now the alignemtn is off. I'm just guessing but from personal experience that's what it would be and that's what they will probably tell you at goodyear

Actually, if they know anything, they'll insist that its NOT the alignment. The only part of an alignment that could POSSIBLY cause a vibration, is an incredible amount of caster. That's it.

Also, if this Goodyear place has the Roadforce balancers, insist that they use those. They'll tell you if there's excessive hop in the tire or a bent wheel.