[69Mach390]

Trying to reduce the vibrations in my car. There's definitely multiple sources (driveshaft was bent, replaced) now I'm working on the tires.

I get a vibration at around 35mph that's pretty bad. I just had the tires balanced an hour ago and they said the tires are a little out of round and have some flat spots.

It's no surprise since the tires are 5 yrs old and the car pretty much sat in one place for 4 of those 5 years.

Also, when I was working on my brakes, I spent quite some time locking up the rear tires getting things adjusted.

Anyone had any luck getting rid of the flat spots?

Only thing I've read so far is to max inflate the tires and drive 150 miles or so. But I've only seen that suggestion in one place and nothing to back it up.

Tires only have maybe 1000 miles on them.

 

[67coupe393C]

Put new tires on the front, then just use the old ones on the rear and burn them round.

 

[frdnut]

My bias ply racing tires do flat spot pretty easily from sitting but the flat spots/vibration also go away pretty quickly once I start driving it....Flat spots from skidding might be a little harder to get rid of.

 

[69Mach390]

As much fun as the smoky burnout sounds, I've read it doesn't really help.

 

[2nd 66]

As much fun as the smoky burnout sounds, I've read it doesn't really help.

while technically it won't fix the tire ,you could look at as a way to use up another wise still good tire :burnout::burnout:

 

[angrywombat]

Put new tires on the front, then just use the old ones on the rear and burn them round.

I like the way you think! :thumbsup:

 

[carguytroy]

Might smooth out after you drive it for a while. If not, new tires, fill with nitrogen. Keeps the pressure at more of a constant. My dad has an 02 thunderbird that pretty much sits all the time. Filled the tires with nitrogen(have a machine at the dealership). The tires have only varied 1-2lbs over the last 5 years. I've never seen tires wear so even in my life. Sounds goofy but it really does do something

 

[Wayne67vert]

I had my tires trued at a local shop.

They shave the high spots off the tire while spinning it on the car.

It made an amazing difference with vibration.

 

[69Mach390]

I think the tire shaving only works with flat spots caused by locking up the brakes, etc.

When I had the tires balanced today, they also moved the fronts to the rear. They still vibrate at the same speed, but before it was more in the steering wheel, now I feel it more in the seat. Seems like those were more of the problem.

I also was surprised how worn the fronts were. Again, maybe 1000 miles on them. Of course a few hundred were driven while the front alignment was ridiculously off. Holy cow that can destroy a set of tires in no time. On the inside, the front tires are more than 1/2 worn down.

 

[67coupe393C]

Wasent trying to say good old smoky burnouts would fix the tires, but it will be fun using up a tire that is no good for anything else.

 

[Wayne67vert]

I think the tire shaving only works with flat spots caused by locking up the brakes, etc.

When I had the tires balanced today, they also moved the fronts to the rear. They still vibrate at the same speed, but before it was more in the steering wheel, now I feel it more in the seat. Seems like those were more of the problem.

You just answered your problem: Have the rear tires trued and the vibration should disappear.

 

[Huskinhano]

Are your tires radial or bias? Bias tend to flat spot more easily, even over night but once they get driven for a few miles and warm up generally run smooth. I prefer machined aluminum wheels because they typically run truer then stamped steel wheels. I would suggest maybe breaking down the tires from the rims and see if in fact the rims do run true or you have one that is fubar. I had a set of aluminum wheels about 30 years ago had the bolt holes drilled way off and had a lot of run out to the point ofnot being useable.