BBBSS

I had the inner edge of the drivers rear tire blow out of nowhere a couple months back. Today I'm poking around the car going over things and looking at putting my new intercooler pump in and turn the tires and see this!

The tires were fine a couple weeks ago with good tread across the tire. Are these bridgestones just junk or do these cars beat the heck out of the inner edges on all four corners? Car tracks in a straight line perfectly, I don't fly around corners at all. Why does it keep eating inner tire edges? Again the thread is fine across the rest of the tire and this happened in a couple hundred miles of driving in the last couple weeks. Tires were built 22nd week of 2008. 4 year old tires shouldn't be rotting away and splitting like mad.

Has good tread across the tire including the area that's separating as shown in the second pic.

Bridgestone Potenza RE760 Sport

GT-ER

I haven't had that happen but I have seen it often on this forum. You have REALLY bad inner tire wear though, some of the worse I've seen. Check your toe settings.

BBBSS

The wear seems to be only on that inner most inch or less of thread. I'd expect the wear to show more across the entire tread at least somewhat. Each longitudinal? Groove has equal wear across the tire and that inner tread block has good depth up to where its split. Never had a tire wear anything like this ever and I've owned all kinds of crazy cars. Just kinda freaks me out and scares me from driving hard. I'm looking to replace the three tires that are still on from when I bought it and have alignment checked.

Forrest Gump 9

+1

Go get an alignment and ask them for as close to 0 toe setting as possible. Also, you probably need some camber bolts from MB too. The E55 takes 4 for the front. Good luck.

bobgodd

Have you changed wheels, or had your car lowered?

GT-ER

The problem is when the car squats down when accelerating and/or hits a bump. If toe is out of whack, it gets even worse when the rear squats down. This is even worse when the car is lowered.

cij911

Toe issue....

moosejaw

Toe issue................. get an alignment

BBBSS

Starting to think its possibly a toe issue. Lol

Also to my knowledge the car was never lowered. Haven't found a single thing to make me think this car was ever modded in any way yet and I've gone through it pretty thoroughly at this point.

Bramage

My option differs here, but I am certain it will solve the problem:










Check Toe

stockC43

A few recommendations of mine,

If the tires were 4 years old, they should be replaced anyways. Porsche recomends every 4 Years mb is every 6 but with a amg or v12 every 4 years is good practice (if the tread lasts that long )

I "personally" have Had nothing but problems with Bridgestone's and Firestone's. I would get Michelin's, contis or a cheaper option hankook v12's

Also, we're the tires the correct load rating? Most people forget this important detail. If you have too low of a load rating, the sidewall will seperate or blow out.

Get a allignment at a dealer, they have a special romis tool to calibrate camber for ride height and they know how to properly level the airmatic before aligning it. Even with your lowered car. Most alignment shops don't know how to do this or have the proper equipment. Also, most Indy allignment shops screw up the allignment bolts. There unique to mb with slots in the bolts and tabs in the bushings.

Good luck

timeToy

Theses tires looks very new, did you got them for cheap on the web?

stevieg

I had a similar issue but the MB roadside assistant asked me if I kept the car in Sport Mode ll alot. He said if you do that, say goodbye to your tires very quickly. The camber on that setting is so aggressive it will wear out the inside of the tires in short order. But getting an alignment would be the first thing I would do just to eliminate that possible cause.
Good Luck.

Jon2007E63P30

I have had similar problems, look for threads I started.

I have done 3 alignments with vey good shops and other than needing a couple camber bolts once, no significant changes.

The F1 Asymentrics I actually got credit from TireRack.com as they identified it as a belt failure. The picture below is my car with in spec alignment.

desired_speeds

it may be beneficial to get tires you can swap from side to side. get them flipped every oil change.

BBBSS

I'm looking at the Pilot Super Sports now. Heard lots of great things and I'll only put 4-8K miles on the car a year so they won't burn up too quick I hope. The car sits in the garage once winter hits and I drive my truck exclusively.

These tires were on the car when I bought it last fall. I don't really know the history of them. The car had 51K miles on it when I bought it and didn't have a ton of miles put on the last couple years so I suspect it sat around a lot more then driving. This, the heat this summer, and that they are 4 year old Bridgestones may be what all combined to kill these things.

Also these Re760 Sports are rated as an "extra load" tire. 1609 lbs max in the stock front 245/40/18. Which is at a higher PSI then stock I'm sure, but it should be well in the tires load range.

Also worth noting the dealer history for the vehicle shows an alignment a few thousand miles ago. Possibly when these tires were mounted?

BBBSS

Was just poking around the net and found another guy with a bridgestone tire that failed very similarly a Potenza 050 in this case. One of the replies was from a guy that says he worked for a Bridgestone/Firestone shop for years and that the tire would be covered under their warranty which is shockingly good it seems. Without receipt 4 years from manufacture date if it fails you get a free one even with no receipt. Up to 6 years without receipt and its pro-rated based on remaining thread.

I think I'll be taking the 2-3 mile drive to my local Firestone with my fingers crossed to see what they will do. I'm just over 4 years from manufacture date, so they'd pro rate, but mounting and balancing is apparently covered and the rest of the tire has a ton of tread left. If they'll go with its a bad belt that let go and cover it I may be able to get a tire for dirt cheap to get me by a couple weeks where I'd be more comfortable popping a grand on new tires.

http://www.bridgestonetire.com/custo.../platinum-pact

The thread I found this in with a fairly similar issue that seems to have been caught a lil earlier.

http://www.gencoupe.com/wheels-tires...r-pattern.html

claywillard

I have Michelin PSS. The fronts are wearing the inside very edge just like in Jon2007E63P30 pic. Approx 1600 miles. Dealer alignment approx 3000 miles ago. Having a realignment done locally by a tech known for great work but probably doesn't have much experience with MB. I know him personally and I know that he craves info. Is there anything that I should relay to him as far MB alignment that is different from other vehicles?

cij911

Just that in factory form, the tech can only adjust front toe. So if you car is lowered, you will likely be running -2 degrees or more of camber (front and rear) and your rear toe will be off for sure. Apparently you can use a "special" MB bolt to make minor tweaks, but most likely if you are lowered a fair bit, you will need something like a KMAC setup.

stockC43

Here's some pix of the bolts needed. The grooves line up with tabs cast into the bushings. They do adjust quite a bit but if your car is slammed kmac might be the only way. Put it this way, my 220 has a very simular suspension set up and is lowered over 3" and front camber/caster is in spec for a euro car. My tire ware is not a issue, my last pair of fronts lasted 25k mi+ befor I swaped them to a wider size.

claywillard

Ok. Thanks guys.
These bolts, I assume they move the A/Arm outwards to reduce Camber?

There is enough material in the ball joint bolt (2-3mm) to oval the holes to allow the ball joint to be repositioned this amount. Would 2-3mm outward adjustment be similar to what the bolts can provide?

TonyC

I got same symptoms, 2 tires blew out this week, within days of each other.



The inside treadwear was fine about 3 months ago and I'd stopped checking monthly since it seemed consistent from beginning of year to summer. Have no idea wtf happened to the alignment. Apparently somehow the rear toe-in got f'd up. Will go to the alignment shop to get toe checked ASAP. Should I get rear camber bolts as well? These Dunlop direzzas were mounted Summer of '10, ran 'em at 37psi. Car's not lowered, airmatic usually on comfrot.

dchl21

do you drive hard ? do you brake while you turn ? ...

i had bridgestone before and i felt that they burn out really fast. ive goodyear eagel now and for 5 mths daily no wear at all. but then i again i usuallly baby my cars.

i only push it once a while.

TonyC

Gas here in LA has hit as high as $5/gal in the last few weeks. On the commute to work, I actually manage 21mpg sometimes. and there's a baby seat in the back. So no, I drive about 20 years older than I look.

Everyone here is saying rear toe-in isn't adjustable, but the indy alignment guy (whom I've used previously) says it is. WTF to do? I'm on spare 19s right now, and really want to swap back to the 18s.

GT-ER

Rear toe is definitely adjustable, I had mine adjusted without buying any parts.