Bias Ply Flat Spots

[snailwagon]

I have some 33" TSL bias ply tires that have been holding up an engine less fj55 for about a year or so. I picked up another toyota and put these tires on.

It has been a while since I've driven bias plies, but normally they get "round" feeling after 10 minutes of asphalt. These tires now are so out of round that the truck gets dangerous above 35mph on asphalt. I drove it for a good 20 miles or so, and even went mud bogging, and they are still super flat and rough.

Can sitting kill a bias ply, and give it a permanant flat spot? These tires have 80% tread still.

 

[Bomar]

I have heard to air them up to max pressure and let sit a day.

Then bring back down to normal driving pressure.

 

[Fryedaddy]

I had some of the same tires that held a 80' cj8 with a ford V8 in it motionless for over a year with no probs. I think the first couple of weeks they had spots but came out. I didn't drive it but 10-15 min a day.

 

[mano002]

I have a set of 34x9.5 TSLs that even afer driving 400 miles in a weekend haven't rounded out. I think one of them is square.

 

[D'Animal]

The Bias ply mud tires on my 67 chevy truck takes a few trips to town to get them round again.

 

[snailwagon]

Drove it again for a while, got it up to 45mph without loosing control, so I guess they are getting a little better.

 

[Azrocks]

Then what happened at 46?

 

[CruisinGA]

I find that if I have my bias ply Irocks above 20psi when sitting for a long time, flat spots are greatly reduced compared to sitting at lower presssures.

I would follow the advice above and air them up to close to the max pressure.

 

['74 UA FJ]

I find that if I have my bias ply Irocks above 20psi when sitting for a long time, flat spots are greatly reduced compared to sitting at lower presssures.

I would follow the advice above and air them up to close to the max pressure.

I agree. When my 40 is going to sit for a while, I air the tires up to around 25 psi and that helps keep them round...er.

 

[nuclearlemon]

are you sure that the tires just aren't way out of balance? what kind of bias plys are they? check to make sure all your wheel weights are still attached. swampers are the worst for this.