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Discussion Starter · #1 ·
OK - I've searched this forum and read and re-read my Owner's Manual looking for a definitive anwser on the restriction for replacing a single tire on the R wrt tire tread depth differential.<p>I found one posting from JRL that says the differential should not exceed 3/32", and if it does then replace all 4 tires.<p>My situation is this. My front passenger side P-Zero (stock tire) tire has developed a bubble/blister of approx 1.25" dia. All four tires have 15,000 miles on them and the wear bar has not been reached on any. The LF/RF both have about 6/32" remaining and the LR/RR have 5/32" remaining. Tires have been rotated front-to-back per Volvo's recommendation every 5000 miles.<p>So I have to replace the RF tire. A new tire has a tread depth of 10/32" to 11/32" (is this correct?). Thus this new tire will mean a tread depth differential of around 4/32" to 5/32" between it and the other three tires.<p>So, should I replace all 4 tires or can I safely replace just the RF tire? The cost difference is substantial at around $800.<p>I'm apt to want to replace all 4 tires but don't want to if it's not really necessary. I know I'll have to replace all four tires before next winter and wonder if tire prices vary such that they are cheaper in summer vs. winter time or at least with the onset of winter.<p>Thanks for any advice.
 

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Re: Tire tread depth differential and replacement question (barrysharp)

put 2 new tires on front and best 2 used on back....
 

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Re: Tire tread depth differential and replacement question (JimLill)

Has R ever come with different tires, other than these crappy P-Zero?<br>I have tire and wheel insurance but I would really want to change to some other tire that might last a little longer.
 

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Re: Tire tread depth differential and replacement question (JimLill)

I agree.<br>The best situation would be to naturally rid yourself of the Pirellis but if you don not want to, replace TWO, put them on the front and then replace the back two in 2 to 4K miles so they will be close to each other in tread
 

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Re: Tire tread depth differential and replacement question (mister2cool)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mister2cool</b> »</i></TD></TR><TR><TD CLASS="quote">Has R ever come with different tires, other than these crappy P-Zero?<br> </TD></TR></TABLE><p>Nope.<p>I see more and more high performance cars being fitted with PZero Rossos. For instance, just saw that the new Jag XK comes with them. Also, the new Noble M15 has them on there as well. They must just be a bad fit for the R, for I can't believe that these cars would be developed around a crappy tire. <p>I have never had the Rossos on my car, but I believe everyone who has said that they wear quickly, cause bad side-hop, etc. But is it more of a case of that it doesn't play well with 4C and wears quickly because the R is so nose heavy?<p>
 

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Re: Tire tread depth differential and replacement question (mister2cool)

You can some times negotiate better tires as a part of the new car deal.<p>I got the dealer to put PZero Nero M+S which have been excellent on the S60R.
 

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Re: Tire tread depth differential and replacement question (barrysharp)

Barry if you do decide to replace all four I highly recommend Discount Tire.<p>Their road hazard coverage will help pay to replace all four if you find yourself in a similar situation in the future. They will pro-rate the remaining tread life on the other three if replacing one will put you out of Volvo's AWD spec. which I believe is 3/32's difference between any two wheels.<p>Haldex isn't as finnicky as the old viscous coupling AWD but it's still recommended to run tires as close to each other in diameter as you can.<p>If it were me I wouldn't buy another Rosso (or two) if I could help it. I've had zero problems with 18" Pilot Sport All Seasons in a year and half.
 

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Re: Tire tread depth differential and replacement question (needsdecaf)

I agree as I think the issue is the combination of tires/suspension design. The P-Zeros aren't the best on the R but there are cars that seem to work better with the Rossos. <p>As a counterexample, the Michelin PS2s that I and many others find to be the best tire for the R bar none are absolutely hated by the RS4 owners at Audiworld (wet, dry, hot, or cold they find the PS2s to be awful):<p><A HREF="http://forums.audiworld.com/rs4b7/msgs/7565.phtml" TARGET="_blank">http://forums.audiworld.com/rs4b7/msgs/7565.phtml</A>
 

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Discussion Starter · #9 ·
Re: Tire tread depth differential and replacement question (StaggRLee)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>StaggRLee</b> »</i></TD></TR><TR><TD CLASS="quote">Barry if you do decide to replace all four I highly recommend Discount Tire.<p>Their road hazard coverage will help pay to replace all four if you find yourself in a similar situation in the future. They will pro-rate the remaining tread life on the other three if replacing one will put you out of Volvo's AWD spec. which I believe is 3/32's difference between any two wheels.<p>Haldex isn't as finnicky as the old viscous coupling AWD but it's still recommended to run tires as close to each other in diameter as you can.<p>If it were me I wouldn't buy another Rosso (or two) if I could help it. I've had zero problems with 18" Pilot Sport All Seasons in a year and half.</TD></TR></TABLE><p>Thanks for the advice. I must admit I'm having great difficulty in nailing down where exactly the Volvo 3/32" differential restriction/limiation in tire tread depth is stated. I can't find it in the Owner Manual or elsewhere. Any ideas where this data might be ?<p>Also, I traditionally buy new tires from Discount Tires in Kirkland. Nice to know another R owner buys from them. Incidentally, I'm about to visit the Kirkland store about Pirelli warranty to see if I can receive any relief on this bubble/blister issue. I'll post back what they have to say.
 

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Re: Tire tread depth differential and replacement question (barrysharp)

Haldex has something on their site about OD delta IIRC<br>
 

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Re: Tire tread depth differential and replacement question (barrysharp)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>barrysharp</b> »</i></TD></TR><TR><TD CLASS="quote"><br>I can't find it in the Owner Manual or elsewhere. Any ideas where this data might be ?<br></TD></TR></TABLE><p>When I killed my third P-Zero, I would have ended up with two at 15k, one at 7k and a brand new one. I called Barrier and asked what the tolerance was and was told 3/32's or ~ 1/2" in circumference difference. <p>This may be as much lore from the old mechanical AWD days as anything else but I didn't feel good about risking it and took them at their word.<p>They knew I wasn't going to be buying tires from them so I doubt it was self-motivated advice.
 

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Re: Tire tread depth differential and replacement question (barrysharp)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>barrysharp</b> »</i></TD></TR><TR><TD CLASS="quote">I'm having great difficulty in nailing down where exactly the Volvo 3/32" differential restriction/limiation in tire tread depth is stated.</TD></TR></TABLE><br>It isn't there. That restriction was with the older system, that didn't have the electronics. If you ran different diameters, the coupling would tighten up in ordinary driving and overheat/wear out.<p>The electronic coupling in the modern (2002-) Volvos is more forgiving, and will feather as needed. But, the same basic principle applies to the coupling itself, and since you want it to apply power evenly and equally, you want to take the same advice.<p>Tom.
 

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Re: Tire tread depth differential and replacement question (JimLill)

FWIW - when I spoke to Haldex nearly two years ago they told me the setup on the R is fine with up to 5/32" differential.<p>I also heard from a separate source that if have a much bigger differential what happens is that the Haldex system shuts down leaving you with a FWD car but there's no damage to Haldex. Of course I can't guarantee or even verify this.
 

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Re: Tire tread depth differential and replacement question (rollie)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>rollie</b> »</i></TD></TR><TR><TD CLASS="quote">FWIW - when I spoke to Haldex nearly two years ago they told me the setup on the R is fine with up to 5/32" differential.<p>I also heard from a separate source that if have a much bigger differential what happens is that the Haldex system shuts down leaving you with a FWD car but there's no damage to Haldex. Of course I can't guarantee or even verify this.</TD></TR></TABLE><p>I heard the same from two sources ( I believe I know one of the sources you are referring to!).<p>As with some of you other guys, I go to Discount Tire as well (in Bellevue). I always ask them to match the price they have online, which they do. This usually saves about $10 per tire.<p>For those who have the Tire/Wheel warranty ( I do as well), you can buy different tires. The warranty will reinburse based on the OEM tire. Anything above and beyond in price will be out of your pocket. <p>My OEM tires are still looking pretty good at 14,000 miles <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>However, when times comes, I will try a different tire.
 

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Re: Tire tread depth differential and replacement question (rollie)

Fine as in, won't damage it, or fine as in delivers full rated performance? Because just because you maybe can run with the compact spare all day, doesn't mean you want to!<p>Tom.
 

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Re: Tire tread depth differential and replacement question (tmtalpey)

The former not the latter is the way it was described.
 

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Discussion Starter · #17 ·
Re: Tire tread depth differential and replacement question (barrysharp)

OK - here's my story to date.<p>Visited my local Discount Tires in Kirkland today where I've been going to for years. I presented the front passenger side tire blister/bubble to them and the guy immediately wanted to replace all 4 tires - and said it's per Volvo's recommendation. Not wanting to question his knowledge base too much it was agreed to have him call Volvo and I suggested my Volvo dealership Sandberg Volvo in Lynnwood. Sandberg Service Advisor said its OK to replace just the two front tires as Volvo recommends if there's going to be a tire rolling dia difference it should be with the front tires being the larger dia. In my case this would mean the fronts would be at 10/32" and rears at around 4/32" to 5/32" (a 5/32" to 6/32" differential). However, Volvo does/did also recommend that all 4 tires be replaced under my circumstances. Volvo does not stipulate that tires must all be with 3/32", 5/32" or whatever as this applied to the earlier non-Haldex AWD systems.<p>Soooo, I first looked at the option of replacing just the front two tires and Discount Tires man shook his head some but no matter I also felt uneasy about this wrt Volvo's advice.<p>I then went into the replace all four tires option thinking that even if I bought just two fronts I'd be back within 3-4 months (start of winter and Seattle rains) wanting the two rears replaced. This is the option I selected.<p>So, here's where I started negotiating on price and Pirelli tire warranty on the blistered tire. The Discount Tires man was very easy to work with during all of my questions and concerns etc and I ended up as follows:<p>($95.25) credit for the blistered tire.<br>($40) credit for two trade-in Pirelli PZeros with tread depth at or above 5/32"<br>($8.38) tax credit on the above two credits <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0"><br>4x Michelin Pilot Sport PS2 at $249 ea.<br>4x $37.50 Certificate for FREE replacement on the Michelin tires<br>4x $11 for Lifetime spin Balance and Valve replacement<br>FREE rotations and lifetime repairs<br>FREE loaner tire and install for the blistered tire at my option<br>$9.30 fee for State environmental and waste tire disposal<p>The total came to $1,158.42 including state sales tax. I plonk down a required deposit for Discount Tires to order my tires.<p>The tires were special ordered and will take 3-5 business days to arrive.<p>I was happy to get the $143.63 credit on the tire purchase.<p>BTW - The Pirelli PZeros were more expensive than the Michelin-s by about $8/tire.
 

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Re: Tire tread depth differential and replacement question (barrysharp)

Excellent!
 

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Re: Tire tread depth differential and replacement question (barrysharp)

Barry I went through this two years ago after my car was hit in the right rear tire. I tried to get 4 new tires (insurance) and had to get an offical ruling from Volvo.<br> The Body shop manager produced a print out from Volvo regarding matching tires for the R.<br> Volvo recommends all 4 tires be the same tread depth and should be changed as a set of 4, but if the tires were to be replaced as a set of two, the new tires,standard Pirelli's are 10/32 new, should go on the front and the worn tires on the rear. The maximum differance between the front tires and rear tires I thought was about 3/32" but its been 2 years.<br> There is documentation from Volvo that spells this out, I've seen it. Check with your service manager.<p> Its amazing you have Pirelli's with 16K miles and that much tread left <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> <br> You got to get on it more.................. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Re: Tire tread depth differential and replacement question (barrysharp)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>barrysharp</b> »</i></TD></TR><TR><TD CLASS="quote">I'm apt to want to replace all 4 tires but don't want to if it's not really necessary. I know I'll have to replace all four tires before next winter...</TD></TR></TABLE><p>Barry, congratulations on the new set of excellent shoes for your R. I think you definitely made the right choice.<p>However, as I followed this thread, the cheapskate in me wondered why nobody made the following suggestion: Buy one new tire and have it "shaved" 3/32 or so to bring it into the difference range you feel comfortable with. Sure, you're wasting rubber by shaving it off, but you waste more by replacing three tires prematurely. And with the allowance for the blistered tire you might spend less than $200.<p>Of course, then you wouldn't get the immediate satisfaction of your excellent upgrade to the PS2s... <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> <p> <br>
 
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