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Discussion Starter · #1 ·
So I just had the first service done at about 7500 miles, where the tires as per the dealer's recommendation (and against the owner's manual... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0"> ) got rotated.<p>I asked them to specifically tell me if they thought the wear was normal, and if the alignment was correct, partly because a few months ago I had the front subframe rear bushings replaced, and they didn't do an alignment b/c they said it wasn't necessary.<p>They told me everything's fine. What's your opinion?<p>This is a front wheel drive car, so I understand the fronts will wear faster than the rears, but does it make sense for the outside part of the tires to be wearing like this? Is it a sign of driving too spiritedly around corners? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"> Or bad alignment? The inside edge when I feel with my hands isn't the same.<p>I'm meticulous about checking tire pressures and keeping them at the recommended 38 PSI, so that's not the issue. I recall on my old Audi A4, even though it was Quattro and all 4 tire pressures were recommended to be the same, people would run about 2 PSI higher on the fronts because of the car's tendency to understeer lots. Should I be doing that for this car too?<p><IMG SRC="http://i454.photobucket.com/albums/qq266/Lotus100/Tires.jpg" BORDER="0">
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Lotus99</b> »</i></TD></TR><TR><TD CLASS="quote">I'm meticulous about checking tire pressures and keeping them at the recommended 38 PSI, so that's not the issue.</TD></TR></TABLE><br>Well, the front is heavier than the rear. Just look at the dirt lines on your tires and you can see how differently the front tires sit/roll than the rear tires.
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

I can't see your photo right now because I'm at work where most photos are blocked (uh, I'm just taking a break <IMG NAME="icon" SRC="http://********************/smile/emcocktl.gif" BORDER="0"> ), but from your description. it sounds like there is more wear on the outside of the front tires than the inside. That shouldn't happen just because your car is (basically) front-wheel drive. For example, my V70 R ran on the OEM Pirelli PZero Rosso tires for 19,000 miles, and the wear across the tread was perfectly even on all 4 tires. If your alignment is right, I think you should get the same even wear across the tire. Don't let anyone tell you that extra outside edge wear is normal on front wheel drive cars. That's hogwash. You can set the alignment on a FWD car so that it wears out the INSIDE edges. It'll be a handfull to drive, though. When you say that the inside edge of the tire feels different to your hand, do you mean your hand "catches" the tread when you run your hand in one direction, but not the other? That would be feathering. Maybe when I see your photo when I get back home, I'll have a better idea. By the way, I've always run 1-2 PSI higher in my front tires than my back tires on all my front-heavy cars. It reduces understeer. Run the same tire pressure front and back if the front and back of your car weighs the same. Your (and my) car doesn't!
 

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Re: Is this normal tire wear on the fronts? (MAC1LSR)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>MAC1LSR</b> »</i></TD></TR><TR><TD CLASS="quote">By the way, I've always run 1-2 PSI higher in my front tires than my back tires on all my front-heavy cars. It reduces understeer. Run the same tire pressure front and back if the front and back of your car weighs the same. Your (and my) car doesn't!</TD></TR></TABLE><br>Maybe he drives around with some bodies in his trunk! <IMG SRC="http://www.smileyslord.com/smileys/ninja-smiley-001.gif" BORDER="0">
 

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Re: Is this normal tire wear on the fronts? (MAC1LSR)

MAC1LSR, the inside edge feels normal to me, in other words, feels like there's a bit of a corner edge still there (like 120 degree angle) compared to the front tires which feel totally rounded.<p>Also, you know how new tires on the outer edge / sidewall have those little prickly rubber things that stick out? Well, I still feel them on the inside edge, but of course, they've totally been worn out on the outside edges.<p>I think I'll start running a couple of PSI higher in the fronts going forward and see what that does, but first I'll get the alignment checked.
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

OK, gotcha. I wouldn't go higher than 38 PSI in the front to reduce understeer. I would run 36 PSI in the rear. That's fine unless you pack your wagon to max capacity.
 

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Re: Is this normal tire wear on the fronts? (MAC1LSR)

Gotcha. I'm running the stock tires that came with the car (235/50/18's) right now, which the sticker on the door says to run at 38 PSI all around.<p>I'll try your suggestion instead of running 40 in the front, for example, which is what I was initially thinking of doing.<p>PS So if cornering too hard was the cause, all 4 tires would have rounded edges on the outside, right, and not just the fronts?<p>Considering the car understeers normally, I was thinking the fronts would wear more on the outer edge maybe than the rears if aggressive cornering was the reason?<p>Or is my logic flawed there?
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Lotus99</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Considering the car understeers normally, I was thinking the fronts would wear more on the outer edge maybe than the rears if aggressive cornering was the reason?<p>Or is my logic flawed there?</TD></TR></TABLE><br>You're right. The front tires will always run greater slip angles than the rear tires, so the fronts will wear more. One thing I forgot to consider is that the XC70 has a higher center of gravity than a V70 and especially something like my V70 R, so if you were to see a slow-motion video of your car cornering hard through a turn, I bet you would see it leaning heavily on the outside edge of the tire, thus more outside edge wear. And you can't change that. But, you will still need to minimize this uneven wear pattern with proper alignment, or else you will be replacing tires with only the outer edges worn off. We had a Jeep Cherokee that ran fine for 120,000 miles, and always had even tire wear, even though it leaned heavily in turns. Why? Because it had live axles front and rear, so the tires were always perpendicular to the road.
 

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Re: Is this normal tire wear on the fronts? (MAC1LSR)

Your alignment is off. Your tires should be wearing evenly if properly aligned. The only difference should be that your fronts, bearing weight and having to turn, will wear faster, hence the rotation. <p>Since you are wearing the outer edge faster, you definitely have an alignment problem. I would go back to the dealer and show them, and I would make a stink that they should give you $$ toward new tires for not having done an alignment. That is not normal.
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

Hi Lotus...<p>You right about the spirited driving. If your spirited driving was the cause, all the tyres would be bald on the outside edges. My friend who drives a Honda Accord ended up with that and had to replaced his tyres after just 12000 miles due to his (I dare say, downright reckless) cornering. <p>I also run my V70 on 38 PSI and check it every weekend. I also like to take corners fast <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> . I've done 10,000km and haven't rotated my tyres yet. On the fronts, I can see the wear beginning to show (surface of thread looks rough but 6mm left) but the rears are looking new (7mm). However, I can still feel an edge on the outside (ie. it isn't rounded yet). <p>For your case, it looks like your alignment needs adjustment. By the way, yours is an XC70, so it's all-wheel drive right? <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Dealers push tire rotation because it's easy money.<br>Last Jaguar I had went as far as to say tyres take a set and will perform better and if there is problme wear something needs to be corrected.
 

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Re: Is this normal tire wear on the fronts? (Lotus99)

This may be comparing apples to oranges, but your fronts are wearing just like mine do when my tires are properly aligned. I rotate mine every 7500 miles and currently have 50K on a set of Michelin Primacies.
 

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Re: Is this normal tire wear on the fronts? (V70 Brad)

Normal...rotate them
 

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Re: Is this normal tire wear on the fronts? (StarmanDXE)

No, it ain't normal! Half shafts left and right are different lenghts and dealer will always throw that out for 'torque' steer feel. The 2009 XC90 with a 6 in it has plenty of power and when you mash the gas and it jumps left and right, that isn't right--half shaft lengh doen't matter. The car should track straight under full throttle...and it does have traction control...<p>Just got my wife's XC90 back from the dealer from it's 7500 mile check-up. I noticed that the right side outside edge of the passenger front tire was worn and noted that when I dropped it off. They called me and told me that both front tires where worn down to the wear bars and said that since the tires were worn evenly, it was from 'agressive' driving (laugh loudly please). Geez, the thing really does get 14mpg in the city--why the hell would I want to drive it like a dragster?<p>I told them "No Way". Then I started talking about camber, caster, and toe and got the service manager. They rotated the front tires back (crossed them) and did a alignment at no charge. Drives like a different car--but, the darn thing drove the same way since we got it new...<p>Front tire toe spec is: -0.18 to -0.03 degrees (toe in left and right)<p>Our car had:<p>0.78 degree (basically toe out) right side<br>0.32 degree left side<p>But what the hell...I was telling my wife it must be steering geometry since they had an in-line six mounted transversely--no wheel well space...<p>I was wrong. <p>Drives like a totally different car today.<p>Don't put up with it. Read some stuff on toe, camber and caster and go in like you know what you're talking about. I plan to get two new tires...and there is no way they aren't gonna give me them...they got the numbers.<p>Joe
 

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Re: Is this normal tire wear on the fronts? (lean2bike)

Thanks Joe for the input. Notwithstanding some of the advice that it's normal, it just didn't seem right to me after only 6000 miles, so I went and complained (<I>after visiting a tire shop who also agreed with me</I>), and they agreed to do an alignment under warranty (so <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> to them for stepping up). They said though that it was normal before, but I didn't think to ask them for the before and after settings, which must have been printed on their internal copy I would assume.<p>I'll watch it in 6000 more miles and if it's truly normal, I guess I'll see it on the old rears that are now up front.
 

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Well, I, too, noticed this on my new tires. Fronts wore on the outside more than on the inside (and more than the rears). Got an alignment and had the tires rotated, so I'll be sure to report back as well! <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 
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