wondering if anyone else has had issues with this, i recently purchased some 225 45's for the front and 275 35's for the rear with a 15mm spacer only for the REAR

my steering shakes like crazy at 70-80 miles an hour, and it disappears at around 90ish.
i blanced the tires multiple times, and changed one in the front that kept going out of spec and the tire guy felt was "out of round" the vibration has somewhat reduced but is still present. is it possible that the rears could make the steering vibrate? i would imagine it could be the spacers if they are in the front, but i only have them in the rear.

im going to put on my spare on all 4 corners and maybe hopefully, i can find the problem tire.

any ideas or similar issues?
also, no vibration issues prior to putting on these tires, and no potholes/curbs hit.

 

With your spacers, could you be rubbing something that caused the vibration?

 

Its most likely your spacers. Are you on stock wheels? Are your spacers ichiba?

Spacers in the rear can still give you a vibration.

If so, check this out.

DIY: Wheel spacer vibration fix - G35Driver

 

One way to find out, take off your spacers and give it another shot

 

Yeah, do what he said.

 

why are you running 225/45 up front and 275/35 in the rear (w/ spacer)? that must look weird.

 

Yep, I had this problem all throughout my Invo's life, even on rebalancing. I think the tires are just junk.

They wore out quick too, 12,000 miles or so. I went back to Potenza re050a (oem tire). They are a little noisier but at least they are round and ride smooth. Plus, the Invos were soft on-center -- now the car feels sharp again.

All this was on stock sizes/wheels on my car.