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X5 E70 (2007 - 2013)
E70 BMW X5 produced between 2007 and 2013. Discuss the E70 X5 with other BMW owners here.

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  #26  
Old 08-10-2014, 03:10 PM
voiture5 voiture5 is offline
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Thanks - I like the idea of doing that.

All I can say is I've read scare stories, and not limited to people with an interest in selling tires..

For example these postings from 2 threads:

https://www.bmwcca.org/forum/index.p...e-xdrive.6101/
"According to the experts at TireRack, the tires on xdrive cars can be different sizes from original equipment (but must be within 3% of original tire diameter), and they need to be within 1% (not to exceed) diameter size of each other to not cause problems."


http://www.xoutpost.com/bmw-sav-foru...er-case-2.html
(my highlighting)

"Couple of years ago when towing my trailer back from the east coast I got a nail in the sidewall of one of my front tires in the middle of WV- Monday of Labor Day weekend. Went to put the original full size spare on and found that it went flat moments after I lowered the truck down and put weight on it. Local WalMart was the only thing open that Monday on Labor Day weekend. Naturally they didn't have a 255/50-19 in stock. We inspected the spare- keep in mind this spare was OE and had never been out of the spare tire well other than to check air pressure twice a year- and when we pulled the tire off the rim, the inside of the sidewall was abraded, with lots of tire shavings on the inside. This tire had never been mounted from new, there was still virgin paint on the bolt seat of the steel wheel. But it was junk. And of course they didn't have a 235/65-17 tire in stock. But they had some inexpensive 245/60-17 BFG's.

Calculating the rolling diameter, it should be virtually identical to the 235/65, just 2% or so off. Mounted one up. Hit the road. Within 50 miles I had the ABS light flickering, followed shortly by the Trans Failsafe warning. Pulled off the road, shut down, waited a few minutes, restarted. Drove a while then trans failsafe again. So I found an exit with a couple hotels and quit for the day. Next morning found another tire dealer who had a 235/65 in stock. He even took the 100 mile old BFG in trade! Hit the road and never had a problem again. Went straight to my dealer on the way home and had the codes pulled, was told the rolling diameter difference threw off the ABS and confused the stability control, and that resulted in the Trans Failsafe light. And that was with just a 2% difference in rolling diameter."
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  #27  
Old 08-10-2014, 09:07 PM
ard ard is offline
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Location: Sierra foothills
 
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Mein Auto: '12 X5 35d/E39M5/996TTX50
You are quoting someone on a BMWCCA forum quoting tirerack (oh, wait- they sell tires...)...tirerack flat out wrong. You dont 'need' to be within 3% if you change all 4 tires- your speedo will be off, but no other issues (unless you are going 10-20% bigger)

And 1% from each other?!?!? OMG, with the sun on one side of the car and shade on the other, the difference in tire pressure will create more than 1% variance..if 1% was an issue, every X5 would be broken down on the side of the road.

Lets look at the other "case study"
Edit: without the model of the tire, there are too many published diameter to pick.... lets just say that the OP likely told the dealer "tire sizes were off" and the dealer parroted back :that's what caused the problem. I reject that a TWO PERCENT delta causes an issue- also keep that that a higher profile (70 profile) will compress much more and the rolling diamter CANNOT be estimated based on the uncomressed tire diameter.

Edit 2: Had some idle time and researched the question of "does the profile./width impact the rolling radius"...short answer is yes. Two tires, same diameter UNCOMPRESSED, the smaller contact patch WILL compress more. So in the example the smaller spare will get much smaller when loaded versus the lager normal tire on the other axle. What looks like a few % on paper isnt.



But let me ask you this...instead of reading scary stories with hyperbolic warnings, did you bother to figure out what % you will have if one tire is 100% and the other tire is say 70%????????? Or pick two numbers to bracket the range of used tires, and use those. Then calculate the rolling diameter, and see what that 3/32 of tire tread ACTUALLY means...

(I have, Ive posted it)

Buy brand new tires, if one gets damage buy 4 brand new tires instead of replacing one.... the tire industry appreciates your fear.

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Last edited by ard; 08-12-2014 at 12:30 PM.
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  #28  
Old 08-11-2014, 01:47 PM
sankom sankom is offline
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Mein Auto: NJ
sankom sankom is online now
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Location: NJ

Join Date: Feb 2013
Posts: 27
Mein Auto: NJ
View My Garage
Tires changed
This is what I did for my tires - 2013 X5 35d

- I had Bridgestone H/L 400 RFTs (i guess). Changed them when 1/8 thread was left (22K miles). Stored them in my shed
- Installed Bridgestone non RFT Ecopia 422 for $846 installed
- Order Spare Tire kit for $380 online

At lease end I will decide, if I buy the car, I will continue using Ecopia 422 and sell the RFTs to someone on this forum who will be stuck at the same situation needing RFTs to return to lease. I am in Central NJ

If I decided to return, I can put RFT back and return and see what I can do with the non-RFTs.

But a decision now can save lots, unless one sticks with RFT till the end ...
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  #29  
Old 06-19-2015, 09:33 AM
phl08 phl08 is offline
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Mein Auto: 2008 X5 3.0
I found a pretty good deal on Goodyear Eagle LS-2 tires for my 2008 X5 3.0si with 8-9.32 tread left. I know the seller, as well, which is partly why he's offering them to me for a good price.

They are 255/55/18 (same that I'm replacing), but they have a load index of 104 instead of the OEM's 109.

104 equates to 1984 lbs per tire
109 equates to 2271 lbs per tire

So, about 300 lb difference per wheel, or 1200 lbs overall.

The car weighs about 5000 lbs. So, with 104 rated tires there's still nearly a 3000 lb overhead for carrying weight.

I never carry anything heavy. Definitely not more than 800lbs MAX in people, and minimal baggage/luggage. And I don't do any performance type driving.

I'm inclined to buy them since their load index is still well above the curb weight of the vehicle, but want to see if I'm missing anything else to factor into this decision.
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  #30  
Old 06-19-2015, 09:52 AM
lpcapital lpcapital is offline
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Running the risk of having people puking all over this, for the past few times I have been buying my tires on Craigslist. All used tires in excellent shape. All you need to be armed of is an understanding of the various specs on the tires: obviously the size is important, but the load index and the speed rating are as well. You may not find the exact load rating and speed rating, but once you know what does numbers are you can use your judgement on whether or not they fit your needs. Another important thing is the production stamp: I try not to go past 2 years old.

On the X5 I now have a set of Continental ContiProContact SSR that I paid $200 for all 4. They were manufactured at the end of 03 and I bought them with 8/32 all around. Similarly with the Z4, I bought 2 rear tires, Pirelli Nero for 80 bucks and 7/32. And before that I have some Michelin Pilot Sport A/S which I paid 100 bucks for just the 2 rears. I've been eyeing these Pirellis for the X5, but I'm too far from the next tire change so I probably let them go: http://sandiego.craigslist.org/nsd/pts/5079120307.html

But yea, when I'm about 1 or 2 months away from needing new tires, I start keeping an eye on CL and eventually something comes up...
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  #31  
Old 06-19-2015, 09:59 AM
Longhorn90 Longhorn90 is offline
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Quote:
Originally Posted by lpcapital View Post
....On the X5 I now have a set of Continental ContiProContact SSR that I paid $200 for all 4. They were manufactured at the end of 03 and I bought them with 8/32 all around. S....
Hoping you meant 13.
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  #32  
Old 06-19-2015, 09:59 AM
lpcapital lpcapital is offline
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Quote:
Originally Posted by Longhorn90 View Post
Hoping you meant 13.
Yes yes yes, sorry 13, not 03...
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  #33  
Old 06-19-2015, 01:17 PM
Flying Ace Flying Ace is offline
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Quote:
Originally Posted by lpcapital View Post
Running the risk of having people puking all over this, for the past few times I have been buying my tires on Craigslist. All used tires in excellent shape. All you need to be armed of is an understanding of the various specs on the tires: obviously the size is important, but the load index and the speed rating are as well. You may not find the exact load rating and speed rating, but once you know what does numbers are you can use your judgement on whether or not they fit your needs. Another important thing is the production stamp: I try not to go past 2 years old.

On the X5 I now have a set of Continental ContiProContact SSR that I paid $200 for all 4. They were manufactured at the end of 03 and I bought them with 8/32 all around. Similarly with the Z4, I bought 2 rear tires, Pirelli Nero for 80 bucks and 7/32. And before that I have some Michelin Pilot Sport A/S which I paid 100 bucks for just the 2 rears. I've been eyeing these Pirellis for the X5, but I'm too far from the next tire change so I probably let them go: http://sandiego.craigslist.org/nsd/pts/5079120307.html

But yea, when I'm about 1 or 2 months away from needing new tires, I start keeping an eye on CL and eventually something comes up...
which brings up a good point. There is no shame in buying used tires as long as you know what you're looking for:

Treadwear measurements
patches/plugs
manufacturing dates

I've bought used tires many times for my M3 and past cars. No issues whatsoever as long as you're informed and check the pictures before you buy. The BMW forums are a great source, at least for the M3, most sellers are people who drove on their tires for about 6 months after purchase, then decided to swap to aftermarket wheels/tires. Win-win situation for both parties.

Separately, there is no universal consensus (nor industry standard) on what is too old for a tire. As long as it was store properly, the rubber and belts shoudn't degrade. I'd still prefer to stick with tires less than 8 years old however.
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Last edited by Flying Ace; 06-19-2015 at 01:18 PM.
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  #34  
Old 06-20-2015, 05:59 AM
phl08 phl08 is offline
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Quote:
Originally Posted by phl08 View Post

They are 255/55/18 (same that I'm replacing), but they have a load index of 104 instead of the OEM's 109.

Turns out on closer inspection, the current tires I have are rated a load index of 105! I bought the vehicle with 30,000 miles 3 years ago and the treads are now just about to the tab (at 73000 miles).

So, whomever had it before me replaced the originals with these instead of using the book recommended 109.

I'll still seek 109 load indexed tires and just call it a day.
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  #35  
Old 06-20-2015, 09:20 AM
Longhorn90 Longhorn90 is offline
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I've gotta cast another vote for keeping an eye on Craigslist. People are always swapping out wheels and/or tires and dumping the old sets on Craigslist.

For example I just did a search on "255/55" in my Charlotte Craigslist. First item to show were take-off (40miles) Dunlop Sport 01 run flats in 255/55R18 for $400. Probably over $1000 if bought new.

Heck, find someone selling a wheel/tire combo with your 255/55R18's; take off the tires for your X5 and resell the wheels. Might net down to even less for the tires with a little effort.
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  #36  
Old 06-20-2015, 09:24 AM
lpcapital lpcapital is offline
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Quote:
Originally Posted by Longhorn90 View Post
Heck, find someone selling a wheel/tire combo with your 255/55R18's; take off the tires for your X5 and resell the wheels. Might net down to even less for the tires with a little effort.
That's how I got a set of 18s for snow tires: original BMW 18s with TPMS. Net cost to me: $150.

Bought wheels for 300 with tires and sold the tire for $150... And they buyer of the tires paid to have them removed.
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