Have you been rotating them religiously? Mud tires will cup badly and change sound as they do unless they are rotated at the exact time that they should.

 

Rotating tires basically masks problems with alignment, wheels, and tires. Rotating the tires helps them wear more or less equally so that instead of getting 60K on a set of tires you only get 50 or 45K miles of wear.

Ford trucks are notorious for this and often only get 20K on the front set while the rear gets up to 60K unmolested. Due the math and you'll find tire rotation is not cost effective in that situation. (Yes, Ford has gotten better in recent years, but still poor in the wear dept)

So tire inflation can be an unavoidable part of the cause on Jeeps since running the tires at optimum pressures may case the Jeep to bounce down the raod like a basketball.

So I;m just being a bit ornery, pointing out some of the problems that happens and that rotation is not a do all end all sort of thing.

 

If you get a humm sound off the tires, thats perfectly normal. The volume increases as your speed increases. As the tires wear the sound becomes louder and more noticeable even at lower speeds. I have the same tires, and the humm is getting louder as the tires wear.

Thats just how Muds work!

 

I have had this happen on every set of mud terrains I have owned. You just have to get used to it, or buy a less aggresive tire.

 

It's not the hum. This I know to expect. My noise is more like there is........
It sounds like there is a sticky spot on the tire , like I ran over a strip of wet tar
and with every revolution it tries to stick. Like how it would be to have gum on one shoe. You don't feel it you just hear it. I did not rotate like I should have, and the front tires after closer inspection did have a strange wear to them.

 

CPR. I'm bringing this thread back to life. I searched and instead of starting a new thread, I'll add to this one.

My JK turned 15k this weekend and I rotated my tires for the third time (first at 5k, second at 10k). I also checked the torque on my Spidertrax spacers and all my suspension components - all is good!

One thing struck me as odd - the tires were much louder after rotating them than before. Noticeably louder. I checked the tire pressure and also visually inspected the tires for uniformity of wear, cupping, etc. and all 4 tires appear to be wearing evenly all around. The Jeep doesn't pull to any side and there are no vibrations at any speed. Just the humm of mud tires, only substantially louder than before.

I use the standard 4wd non-directional rotation technique that I've been using for 15 years (on the left). I only rotate 4 tires - I don't include my spare.



Although I know that MT tires get louder with tread wear, I've never had an instant increase in tire noise like this. The only thing I can think of is that the rear tires are wearing faster than the front (which makes sense since I offroad quite a bit in gravel and sand in 2wd). Now that the rears are up front, I hear them more?

Anyone have the same problem?

 

This has to do with how cupped the tires are. As mud style tires rug, the back side of the lugs wear faster than the front side. When you rotate, it changes this. And it will make them louder for a while until they start to wear some, then they will get quieter.

 

I had the same increase in noise with my M/Ts, although slightly different circumstances.
Only very mild off-roading on mine; mostly daily-driver street driving. Rotated at 3,000; included the brand-new spare, which I put on the right rear -- farthest from me. Still much louder road hum.

I attributed it to the change in direction of the right front, which is now my left rear. But assumed it was normal. Wear is even.

 

Every set of BFG M/T's I've ever owned has done that. I guess it's just the compound they use. I moved up to Nitto Mud Grapplers on my last truck and they never did it. But they hummed so loud, I wouldn't have been able to really tell anyway

 

I started rotating mine every 3000 miles because I corner more agressively than the M/Ts were designed for and the fronts like to start cupping a little bit on the outer edges. I'm also doing a 5 wheel rotation and it helps to keep the tire wear more even.

I've never checked my aligment, but the Jeep only has 7800 miles on it and I haven't done anything to knock the alignment out. It also tracks very straight and I'm pretty sensitive to noticing things like that. I noticed that it didn't track right when I had a 2 PSI differential in my front tires...