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Old 12-30-2008, 11:38 AM   #1 (permalink)
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On the way to work yesterday a slab of wood that looked like a fence post came out from under the car just ahead of me and I had no time or choice but to roll over it. Well I rolled over it at 60 mph and it bent the interior edge of my rim in and caused my tire to go flat nearly immediately. I had 5/32" tread depth left and had to get a new tire. I run the Pirelli P-Zero Nero's and so they come new with 11/32".

The question is, does having one tire with more tread pose a problem or risk of damage to our AWD system? I have driven around and so far no lights or apparent problems.

Also, this is a more serious question, I called an alloy wheel repair service and they were able to fix the bend in the rim. He said that sometimes they crack when they straighten them and when he saw mine, he gave it about an 80% chance of cracking. It didn't and said it straightened perfectly. It appears to roll smoothly BUT is there a risk of metal fracture or fatigue that we can't see that could cause the wheel to explode/come apart at high speeds? Remember this is the interior edge of the rim. Just wondering if that's a cause for concern even though all seems well. Thanks!
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Old 12-30-2008, 12:15 PM   #2 (permalink)
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QUOTE (MattOKC @ Dec 30 2008, 10:38 AM)
Quote:
On the way to work yesterday a slab of wood that looked like a fence post came out from under the car just ahead of me and I had no time or choice but to roll over it. Well I rolled over it at 60 mph and it bent the interior edge of my rim in and caused my tire to go flat nearly immediately. I had 5/32" tread depth left and had to get a new tire. I run the Pirelli P-Zero Nero's and so they come new with 11/32".

The question is, does having one tire with more tread pose a problem or risk of damage to our AWD system? I have driven around and so far no lights or apparent problems.

Also, this is a more serious question, I called an alloy wheel repair service and they were able to fix the bend in the rim. He said that sometimes they crack when they straighten them and when he saw mine, he gave it about an 80% chance of cracking. It didn't and said it straightened perfectly. It appears to roll smoothly BUT is there a risk of metal fracture or fatigue that we can't see that could cause the wheel to explode/come apart at high speeds? Remember this is the interior edge of the rim. Just wondering if that's a cause for concern even though all seems well. Thanks![/b]

Well, the difference in tread is going to put a bit more stress on your LSD, and your center diff may engage more often, as the ecu will see a bigger difference between front and back than before (assuming all of your other tires are worn equally.) But I have no idea if this is anything to be concerned about.

The bent rim is almost guaranteed to be weaker in the spot that was bent. I highly doubt it would come apart at high speeds though. It would probably be bent again more easily than before if something were to hit that spot, but how likely is that?
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Old 12-30-2008, 12:38 PM   #3 (permalink)
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you def shouldent ride around with 1 tire with 100% thread and one with 50%. maby 80/100 but thats too big of a gap. its gona throw off your ish. just buy another tire and sell the one u have with 50% tread life.

as far as the rim goes, ive bent a few rims but they were all too extreme to be fixed. because its on the inside edge i would keep a very close eye on it as u cant just walk around the car to check on it daily.
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Old 12-30-2008, 12:45 PM   #4 (permalink)
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I've bent rims before, had them repaired and they did fine up until I hit another pothole. A previously bent rim will be weaker in holding up to damage, if you hit a pothole, curb, etc. just know that you may bend it beyond repair or rip the lip. See this link for example.

I definitely would not use a tire that has more tread by a significant amount. Either hit up a used tire place to see if they have the same tire with similar wear or buy 3 more matching tires.
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Old 12-30-2008, 12:48 PM   #5 (permalink)
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Yeah as he ^^ said I would invest in another tire to put on the other side to keep the car riding even. No need to have unneeded wear on suspension components because of two different size tires due to tread. How bad would the wear be? I'm no expert but some risks aren't worth it. Tires are all that keeps your car on the road, so they are one of the most important components to maintain. On the same note, if the wheel is damaged to a point where its structural integrity is at question, I'd either repair or replace that as well. Sucks spending money on shit that breaks out of pure bad luck, but the safety of you and others is much more important then possibly riding around on a time bomb.
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Old 12-30-2008, 12:49 PM   #6 (permalink)
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Our drivetrain is really that sensitive?...
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Old 12-30-2008, 12:52 PM   #7 (permalink)
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QUOTE (Turbo6Girl @ Dec 30 2008, 12:45 PM)
Quote:
I definitely would not use a tire that has more tread by a significant amount. Either hit up a used tire place to see if they have the same tire with similar wear or buy 3 more matching tires.[/b]
Some tire vendors offer a service to shave a new tire to match the other 3. Just another option to consider.
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Old 12-30-2008, 12:54 PM   #8 (permalink)
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I've had an issue with running tires that were worn differently... over 100mph ecu decided that something was going terribly wrong and I didn't need my 4wd, abs, or dcs any more ... yea... once I got a new set of tires - it was fine, pushed her much faster and nothing happened.

before someone starts jumping on my nuts for the tire ware ... I wore my front ones pretty badly after a few track days - that's why they had different wear on them, not because I bought them that way. One thing I learned - don't cheap out on tires.
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Old 12-30-2008, 12:56 PM   #9 (permalink)
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Just put the new tire on a Honda, ask him to do some good one tire fires and it will be worn down in no time.
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Old 12-30-2008, 12:58 PM   #10 (permalink)
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I can wear it off for you on my Yota! 1 wheel drive FTW!!!
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