I was wondering if there would be any other causes besides but misalignment or bad wheel balancing/bent wheels?

I figure if it's actually a suspension part that's bent, it would just cause pulling, not wobbling at speeds.

 

You've gotten an alignment and wheels balanced and still getting vibration in the rear correct? This may be a case of pitted cv buckets/cups.

https://www.s2ki.com/s2000/topic/241...diy-with-pics/

 

My 2 cents:

Last year, I found my wheels shaking after a fast ride on the highway. After some lighter driving, it seemed to go away.

I realized my front brake caliper was sticking, heating up and temp warping the front wheel. Feel the front wheels after a ride. One was noticeably hotter!!

New calipers and all was well again.

 

Thanks guys, I'll check the caliper issue after my drive home tonight, and after I get another alignment done where the caster is the same on both sides (long story, I told the tech to max them, he did, but they maxed at different points and he thought it would be ok if they were uneven...) as well as re-balanced wheels I'll check the CV pitted issue. I have lifetime on both since I bought the tires at discount and I bought the lifetime at firestone which is 1/4 a mile away.

 

Chances are slim to none your issue is caused by a bad caliper or alignment. Even though its possible, I can say with almost 100% certainty that these are not your problems.

Concentrate if the vibration is on acceleration only.

If you can get the vibration to stop the instant you release the throttle, then the CV joints are the problem. Swap buckets side to side for a $0.00 fix.

If it's on accel and decel consistently, it is almost guaranteed to be a wheel/tire problem.

 

Well at this point I can guarantee it's not the caliper binding. On to the next possibilities.

Also, one detail I forgot is that my new rims don't have hub centric rings but I am very slow and careful when mounting, tightening in a star pattern only 1/2 turns until all are tight @ 80 ft/lbs, so I doubt it's a centered mounting issue.

Billman, I notice the vibration is present under all conditions above 75 mph, and only exists when I get going those speeds. SO I'm thinking that with centripetal acceleration it's looking more and more like bad balancing or a really warped rim. I hope not, as the rims are brand new. I read recently that something else the mounters should do is match the low point on the rim with the high point on the tire (or was it the other way around.. regardless). Do you know of what markings they might use to judge this? I Can hardly see them taking the time to measure it themselves.

 

my car vibrated from 72-85 on some roads, replaced my 6+ yr old tires from original owener, vibrating gone.

 

Brand new tires & rims, less than 1k on them. I hope it's not that issue

 

whats your rear toe?

There are colour markings on the tire I believe blue and yellow dots...saves the tire shop money by using less weights...

 

I actually had this problem as well. Mine felt like a slightly out of balance tire or drive-shaft. I could feel it around 65-70 or so. Checked it last night after reading this thread and it turned out to be a sticking rear caliper. The driver rear was hanging slightly. It was difficult to turn by hand. I removed it, cleaned it, lubed it and turned it in and out a few times then reinstalled it. It's not hanging anymore and the vibration is gone. I then ordered two new rear calipers to replace.