Tire bulge

Hardly noticeable on my almost new wranglers, but you can see it between the A and the N, more at the outer edge I think it becomes more noticeable as the tires age a bit.

This explains it a little.
CCp'd

Sidewall Indentations / Undulations



Fig. A: Vertical indentation on sidewall from rim to tread.

A common byproduct of radial tire construction, sidewall indentations/undulations are more noticeable in tires with taller sidewalls or operate at higher inflation pressures. Fortunately sidewall indentations are a cosmetic condition that does not affect the performance of the tires.

Tire casings are reinforced by multiple fabric cords encased side-by-side in a thin sheet of rubber. Radial ply tires feature one or more layers of cord (depending on the tire's required strength) that run parallel to each other from bead to bead (with each individual cord running up the sidewall, across the tread and down the other sidewall). Because of their "straight across" radial orientation, the overlaps where the sidewall cords are lap-spliced may cause indentations.

When the tire is being cured, it is pressed against its metal mold. However when the tire is mounted on a wheel and inflated to operating air pressures, it is free to expand. These overlapping splices may create slight indentations since the stretching capacity of the lap-splices is slightly less than the rest of the body ply. In reality, the splices are the most reinforced area of the tire's sidewall.

Since radial tires feature steel cord reinforcing belts under their treads to keep them flat, indentations only appears on the sidewalls.

We have 8 cars plus the motorhome. I keep fresh tires on all vehicles. I have never seen these type of indentions before.

MM.

IF that's the first time you seen that, I'd have to wonder where you all been. I too wondered what it was, but that had to be 20+ yrs ago.

Indent, not bump. No problem. Been researching this myself lately.

Old-Biscuit wrote:
Are your tires 'radial ply' construction?

Here is some tire info.
Article

Yes. And great link. . .!

We have those in our Cooper tires,tire dealer told us it was normal and explained it pretty much as that link explained it.

Probably not a warranty-able defect. We've had new tires with "wrinkles" like that. New truck should have Tire Warranty in the paperwork package. Suggest running it past the nearest dealer for that brand and confirm. Some vehicle dealers are also tire dealers, but I wouldn't count on it. Still, your dealer may be able to help.

Are your tires 'radial ply' construction?

Here is some tire info.
Article