Busted cords

[WaterH]

So I have a vibration in my tires. It seems to have come all of a sudden. A friend of mine suggested it might be a busted cord in one. I have always understood that a busted cord will show as a bulge in the tire, but he says not always. Sometimes it barely shows until a lot of them bust. What says Irate? I have big military tires, so that may make a differnce. I can’t see any bulge. I spent the last couple days balancing these tires with an electronic balancer. When it comes to balancing, I know my stuff. I assure you they are among the best balanced tires on the road. But in a short test drive, I’m getting bad vibrations.

 

[ThePanzerFuhrer]

How old are they? If they truly are military surplus they are probably aging out.

What speed is the vibration showing up at?

 

[SLOWPOKE693]

Put it on jack stands, pull the tires and run it up to whatever speed you feel the vibrations and see if they are still present. Its possible you are mistaking a different problem for tire shake.

 

[CarterKraft]

So I have a vibration in my tires. It seems to have come all of a sudden. A friend of mine suggested it might be a busted cord in one. I have always understood that a busted cord will show as a bulge in the tire, but he says not always. Sometimes it barely shows until a lot of them bust. What says Irate? I have big military tires, so that may make a differnce. I can’t see any bulge. I spent the last couple days balancing these tires with an electronic balancer. When it comes to balancing, I know my stuff. I assure you they are among the best balanced tires on the road. But in a short test drive, I’m getting bad vibrations.

IMO the busted cords show up much earlier than the Egg or Boom, it's just subtle at first.

Jack it up and check the run out if you suspect it.

 

[SLOWPOKE693]

Jack it up and check the run out if you suspect it.

I would think it would have been obvious when he had them on the balancer.

 

[CarterKraft]

I would think it would have been obvious when he had them on the balancer.

Agreed but maybe he perfectly balanced that out?

 

[SLOWPOKE693]

Agreed but maybe he perfectly balanced that out?

The runout should be visible balanced or not

 

[CarterKraft]

The runout should be visible balanced or not

Agreed

 

[Zg86]

As much as it pains me to admit it slowpokes right

 

[Zg86]

I would think it would have been obvious when he had them on the balancer.

Some people (not me) actually dont bypass the hood safety on the balancer

 

[SLOWPOKE693]

Some people (not me) actually dont bypass the hood safety on the balancer

Do you think he has a hood on there with 46" XML's?

Even with a hood you can still see part of the tire enough to notice runout.

 

[WaterH]

I balanced the tires on the truck with my helicopter balancer. I removed the rear drive shaft and jacked up the front. Put it in 4x4 and only locked the pax side hub. Didn’t really look for run out, but I will

 

[Zg86]

Do you think he has a hood on there with 46" XML's?

Even with a hood you can still see part of the tire enough to notice runout.

Valid point.

 

[Zg86]

What the **** is a helicopter balancer?

 

[tsomctl]

What the **** is a helicopter balancer?

Don't know, but I do know I want one.

 

[WaterH]

What the **** is a helicopter balancer?

It’s just an electronic balancer. I’ve used it to balance all kinds of ****. The tire ones are set up for one job, but the principal is the same.

The sensor that is vise gripped to the knuckle is an excellorometer and the photo cell is the one clamped to the Jack stand. It shoots at a reflector on the wheel to give you a clock angle. A tire balancer has this same ****, just behind the hub. I have remote box computer that I can sit in the drivers seat to operate the balancer while holding 60 mph on the truck.

 

[tsomctl]

It’s just an electronic balancer. I’ve used it to balance all kinds of ****. The tire ones are set up for one job, but the principal is the same.

The sensor that is vise gripped to the knuckle is an excellorometer and the photo cell is the one clamped to the Jack stand. It shoots at a reflector on the wheel to give you a clock angle. A tire balancer has this same ****, just behind the hub. I have remote box computer that I can sit in the drivers seat to operate the balancer while holding 60 mph on the truck.

You have a model number? I want to read the manual. I've been thinking of building something like that with an arduino.

 

[Zg86]

Ok thats neat.

 

[WaterH]

You have a model number? I want to read the manual. I've been thinking of building something like that with an arduino.

I think it’s a Chadwick 2500. I don’t think they make that model anymore. It would be nice to make one because they ain’t cheap.

 

[Zg86]

Its the equivalent of a on car brake lathe but for tires. Hell you could use that to straighten semifloat shafts if you put some thought into it.

 

[WaterH]

So I reduced the tire pressure and it got better. Still seems rough and one tire makes sort of a slipping sound. So I guess if you run lower tire pressure, a “out of round” tire won’t matter as much because it just flexes in at the high spot?

 

[KacksterK5]

So I reduced the tire pressure and it got better. Still seems rough and one tire makes sort of a slipping sound. So I guess if you run lower tire pressure, a “out of round” tire won’t matter as much because it just flexes in at the high spot?

Yes, it flexes more and the cord inside the tire moves more and generates more heat/loses breaks away from the tire carcass

 

[TrailTamer]

at least 3 out of 4 32x11.50R15 Cooper Discoverers I bought brand new which all suffered some sort of belt/cord failure a year or two after install.

That sucked as they had like new tread depths.

How I found out was by to jack the TJ up and idle in drive spinning tires. I can naked eye visibly see thread move up down (run out) AND side to side. Drove on them a long time to get money's worth out of them. Drove fine under 50 mph, super annoying shaking above that. The TJ pretty much stayed in the town None of them ever blew up, but interesting on how they wore... nowhere near evenly. Nearly smooth bald in some area, while other portion of tire tread its not down to wear bars yet and that is on one tire.

 

[WaterH]

So I jacked the front up a spun the tires by hand with a Jack stand next to the tread.

The runout is slightly less than a 1/4”. Not sure if that is terrible. I did some searching and couldn’t find much. On the Steel Soldiers site someone declared between 1/4” and 3/8” runout requires the tire to be shaved. Funny, they also mentioned that GoodYear tires are the worst for runout.

I built a tire shaver along time ago.

It’s just a saw mounted on some drawer slides. I didn’t like it along time ago and I like it less now. The sliders are just too “iffy”. So I flipped the board and clamped the saw.

This way, I can position the saw and just slowly spin the tire around. Than I would move the whole works over an inch and do it again. I can’t say I like this setup much either, but I was able to shave about an 1/8” off the high side on one tire. I’m going to road test it tomorrow and see if I can tell any differnce.

Of note, the high side of the tire was opposite the weight I had to add on the wheel to balance. I guess I will have to rebalance if I shave much. Doesn’t seem like I took off much weight in rubber, but it’s further from center than the balance weights.

 

[Steve300xcw]

Props for doin that

Knowing my luck, I'm not sure I'da fired up the 'ol grinder saw

 

[tsomctl]

Props for doin that

Knowing my luck, I'm not sure I'da fired up the 'ol grinder saw

At the very least, have it on a foot pedal.

 

[Steve300xcw]

At the very least, have it on a foot pedal.

c clamps on cinder blocks. You dont need a foot pedal with that kinda safety goin on

My luck, that bitch woulda hooked an cut my tire in half

 

[WaterH]

c clamps on cinder blocks. You dont need a foot pedal with that kinda safety goin on

My luck, that bitch woulda hooked an cut my tire in half

When I had it on the sliders.

It got into that one lug pretty good. Don’t quite understand why it sucked in to the left. Seems like it should have went right.

As far as a foot pedal, that would be nice. It spits hot rubber all over. I had cardboard all around, but still had to stick my hand in there to hold the button. If I do more, I’m going to tierap the button and just plug it in to start.

 

[Steve300xcw]

Back to this. How much thinkin happened before you sent it?

 

[WaterH]

Back to this. How much thinkin happened before you sent it?

Well I saw a similar setup on Steel Soldiers. He had it mounted to a heavy tool box. Mine are not standard cinder blocks. They are the 12” wide ones. It’s pretty heavy. As long as I fed it slow, it worked good.