Tire developing lumps

[SawyerRanger]

The guy who I bought my ranger from said that sometimes tires on a 4x4 can develop lumps, he didn't really have an explanation for it, he just reccomended rotating the tires and stuff. So the other day I was checking out the treads on my tires and i felt like a lump (you couldn't see it) on the driver's rear tire. Does anyone know why this happens, or if anyone else has heard about it? FYI I have Wrangler RT/S tires if that makes any difference.

Thanks guys,
Jake

 

[gotmudd]

might be talking about cupping, not sure what causes it just know it sometimes takes care of the problem to keep your tires rotated, again not real sure. only had it happen once

 

[SawyerRanger]

yeah that's pretty much what he said too, he called it cupping as well now that i think about it

 

[pimtool]

The front tires will cup, cause when you turn the tires kinda roll and push on the outer edge. The rear tires will wear more in the center of the tire. Look at the tires on trucks when you walk past them and you can tell who rotates their tires and who doesnt.

 

[mudmobster]

i work with tires maybe i can help

are you talking about heel toe wear(cupping)or is thread lifting .is it on the sidewall and if it is does it go in or out.i have worked at tire shop for ten years if let me know i can help you fix it the right way.

 

[4x4junkie]

Yeah, cupping almost always happens on the front tires, not the rear. Being a rear, it sounds like possibly a tread separation issue maybe. I'd check that out right away.

 

[98ranger4x4]

Yeah, cupping almost always happens on the front tires, not the rear. Being a rear, it sounds like possibly a tread separation issue maybe. I'd check that out right away.

+1

 

[Hardwareman]

I had a set of TrXus Mt's by Interco on my Ranger a while back (few years ago actually) and they started cupping because I had worn out shocks.





Allen

 

[Hahnsb2]

Yup, cupping is normal if you don't rotate your tires. I had a set on my B2 a couple years ago that were ran on another b2 and the 2 fronts were cupped pretty good and gave a good vibration at low speed. Those tires are now on a friends sploder, they're only little 235 Cooper STTs but goddamn they're deafening at highways speeds, my swampers don't hold a candle to em.

 

[SawyerRanger]

the bump was actually on the sidewall

EDIT: And to mud, the bump goes outwards. I was thinking about having them rotated soon, but the two back ones are almost near replacing so I'm thinking I may drive it a little more until I replace them. I'm going to get a front end alignment soon so i'll ask the guys there about it then, but any info you have for me would be awesome, i love info.

 

[mudmobster]

is it gone in or out .does it start at bead if it does how long have you had the tire because could have had the bead cut by the tire shop.

 

[98ranger4x4]

if its on the sidewall it is an impact break, and should be replaced immediately. it is caused by hitting something (hence the name "impact break") like a pothole or whatever. it has nothing to do with rotation, alignment etc....

 

[mudmobster]

when you have it removed check the bead yourself .the shop mite not tell you if they had cut it putting it on.if they cut it ,make them help you out with the new one.

 

[Twizzler09]

An outwards bump on the sidewall, that sounds an awful lot like an impact break to me. Which those can be very very dangerous. I have a story on this very subject.

Guy comes into the shop I work at (I work in a tire shop), and says his tire keeps going flat. We say ok we'll check it out. He had parked right in front of one of our garage doors, so I just ran the car onto the 4-post. Got the rear end in the air (it was his right-rear tire). It hardly had one bit of pressure in it. So I started to put some air in it to check for leaks, the sidewall started bulging immediately. I quit putting air in it (only had maybe 5 pounds of pressure) but the bulges kept getting bigger, and BAM! The sidewall blew out of it.

Basically, if he had driven it on the street for even a few more moments than he had, the thing would have exploded on the street.

Moral of the story: Dont mess with sidewall damage, or you'll end up paying for it.