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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 03-31-2010, 08:43 PM
TireSmoke TireSmoke is offline
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Replace one or two tires?

Thanks to a deep and sharp pothole I am now looking to support our economy by purchasing a replacement tire.

The side wall was cut and the tire cannot be repaired. The current tires are - Michelin Pilot Exalto A/S (non-RFT) with 7/32 inch tread depth left. I would like to replace with an identical new tire. The new tire has 10/32 tread depth.

The dilemma is obvious - replace one tire or two on the same axle. I did some searching and some say replace both to avoid the strain on the drive system (I have 2006 E90 330xi), especially for an AWD car. Others say that if the difference is below 4/32 I might be okay replacing just one tire.

What's your understanding? Does anyone know BMW guidelines on the issue?

I could also order Tirerack to shave the new tire to 7/32 at a cost of $35. How do you like that option? Has anyone used it?

Thanks
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  #2  
Old 03-31-2010, 10:03 PM
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1985mb 1985mb is offline
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What's your tire size? There are a ton of choices in the "typical" 17" and 18" sizes such as 225-235-245 with 45 or 40 profile... conceivably you could get 2 tires of another good brand for just above the price of one Michelin
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  #3  
Old 03-31-2010, 10:39 PM
nyfellas nyfellas is offline
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I replaced only one rear left tire [cracked the rim too] due to a pothole explosion, so far no problem [over 110 mph it seems like my car wants to drift to the left, went to the dealer, they checked and of course, they couldn't find any problem]..

Tire had 8,000 miles on it..

Last edited by nyfellas; 03-31-2010 at 10:42 PM.
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  #4  
Old 04-01-2010, 12:47 AM
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rich8566 rich8566 is offline
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Quote:
Originally Posted by TireSmoke View Post
Thanks to a deep and sharp pothole I am now looking to support our economy by purchasing a replacement tire.

The side wall was cut and the tire cannot be repaired. The current tires are - Michelin Pilot Exalto A/S (non-RFT) with 7/32 inch tread depth left. I would like to replace with an identical new tire. The new tire has 10/32 tread depth.

The dilemma is obvious - replace one tire or two on the same axle. I did some searching and some say replace both to avoid the strain on the drive system (I have 2006 E90 330xi), especially for an AWD car. Others say that if the difference is below 4/32 I might be okay replacing just one tire.

What's your understanding? Does anyone know BMW guidelines on the issue?

I could also order Tirerack to shave the new tire to 7/32 at a cost of $35. How do you like that option? Has anyone used it?

Thanks
Go for the shaved tire option. I've never used the Tire Rack for that service, but I have used them on many, many other occassions and trust them to do a great job...
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  #5  
Old 04-01-2010, 05:32 AM
TireSmoke TireSmoke is offline
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Quote:
Originally Posted by 1985mb View Post
What's your tire size? There are a ton of choices in the "typical" 17" and 18" sizes such as 225-235-245 with 45 or 40 profile... conceivably you could get 2 tires of another good brand for just above the price of one Michelin
The tire size is 225-45-17R.
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  #6  
Old 04-01-2010, 06:12 AM
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MrBones MrBones is offline
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Another option is to get 2 new ones, but save the old one in case this happens again-you'll have a pre-worn tire!
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  #7  
Old 04-01-2010, 07:05 AM
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furby076 furby076 is offline
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I would get two new tires, and keep the old as a spare. How much are you going to shave the tire by? How many miles is that equivelant too?
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  #8  
Old 04-01-2010, 09:17 AM
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MrBones MrBones is offline
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Quote:
Originally Posted by TireSmoke View Post

I could also order Tirerack to shave the new tire to 7/32 at a cost of $35. How do you like that option? Has anyone used it?

Thanks
Isn't this like paying $35 more than the cost of a new tire for a used tire?
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  #9  
Old 04-01-2010, 09:19 AM
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furby076 furby076 is offline
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Isn't this like paying $35 more than the cost of a new tire for a used tire?
Yes, but the reason is so he doesn't have to buy another tire for the other side of his car. It is recommended that if you change one tire you change the tire on the opposite side so they are approximately the same tread depth.
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I agree with furby
Quote:
Originally Posted by guerilla twang View Post
Hahahaha, I like you furb, you like to live dangerously.
Quote:
Originally Posted by ProfessorCook View Post
I started to google to find a picture to match furby's suggestion to Gia, but it quickly became clear it was an inappropriate search to conduct at work.
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  #10  
Old 04-01-2010, 10:45 AM
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Bcube Bcube is offline
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the closest I found to an official statement by a tire manufacturer.

http://www.coopertire.com/html/pdf/s...ulletin113.pdf
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  #11  
Old 04-01-2010, 11:11 AM
1CEBITN 1CEBITN is offline
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I don't have AWD but did replace just one front tire w/13k on it and had no problems. I only had a 2/32" difference though and the guys at NTB weren't concerned about it. I would just get one and if you have problems get the other. With that small difference in tread depth I highly doubt you will have any mechanical issues, the road isn't even level to within 1/8" so the car won't notice.
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  #12  
Old 04-01-2010, 11:16 AM
speedy_sam speedy_sam is offline
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I had an AWD Audi S4 and replaced a single tire about two times when they flat. I never had any differential or other mechanical issues - I have driven about 30,000 miles since the last tire incident.

But I guess I was lucky.

Going with the suggestion of shaving the new tire to match the other rear tire seems like the right choice to me.
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  #13  
Old 04-01-2010, 11:23 AM
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furby076 furby076 is offline
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Quote:
Originally Posted by Bcube View Post
the closest I found to an official statement by a tire manufacturer.

http://www.coopertire.com/html/pdf/s...ulletin113.pdf
I am having problems opening htis file, it's locking up my browser (repeatedly). What's the nutshell answer?

I've had tirerack tell me if I replace one tire I have to replace all four. I told them that was bogus and qualified that with - what do I do when I have staggard tires.

The change is marginal from one tire to the next, I mean it's less then an inch difference...hell the amount of weight I put on my car by me sitting in the left side and nothing on the right side to counter must be more.

Given that - I have heard from enough people to buy into the changing of tires on the same axle. Keep the old one as a spare.

I would go against the shaving...it's a waste of your cash.
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"Booberry" -ED 2013 335xi | B45 | ZMM | ZDA |Heated Seats | HK |EBII
My Drive Style

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Quote:
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I agree with furby
Quote:
Originally Posted by guerilla twang View Post
Hahahaha, I like you furb, you like to live dangerously.
Quote:
Originally Posted by ProfessorCook View Post
I started to google to find a picture to match furby's suggestion to Gia, but it quickly became clear it was an inappropriate search to conduct at work.
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  #14  
Old 04-01-2010, 01:37 PM
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rich8566 rich8566 is offline
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Quote:
Originally Posted by furby076 View Post
I am having problems opening htis file, it's locking up my browser (repeatedly). What's the nutshell answer?
REPLACING LESS THAN FOUR TIRES
When replacing tires on a vehicle, it is recommended and preferred that all four tires be replaced at the same time for continued optimal vehicle performance. However, for those cases where this is not feasible, below are some general guidelines to consider when replacing less than four tires for a light vehicle, whether it is one or two tires. If the vehicle manufacturer has alternate recommendations, always follow their recommendations.
IMPORTANT
In some cases, the vehicle manufacturer may specifically advise against replacing less than all four tires. Always check and follow the recommendations in the vehicle owner's manual. For 4WD and AWD vehicles, even small differences in outside diameter may cause drive-train damage or mechanical malfunction.
Replacing Two (2) Tires - When a pair of replacement tires is selected in the same size and construction as those on the vehicle, the two newer tires should be installed on the rear axle unless the new replacement tires are of a lower speed rating (see Cooper Service Bulletin # 107 "Tire Mixing***8221. Generally, new tires with deeper tread will provide better grip and evacuate water more effectively, which is important as a driver approaches hydroplaning situations. Placing greater traction on the rear axle on wet surfaces is necessary to prevent possible oversteer condition and possible loss of vehicle control, especially during sudden maneuvers.
Replacing One (1) Tire - Replacing a single tire on a vehicle can have an adverse affect on suspension systems, gear ratios, transmission, and tire treadwear. If single tire replacement is unavoidable, it is recommended that the single new tire be paired with the tire that has the deepest tread and both be placed on the rear axle. Placing greater traction on the rear axle on wet surfaces is necessary to prevent a possible oversteer condition and possible loss of vehicle control, especially during sudden maneuvers.
You can order additional copies of this Service Bulletin through the Consumer Relations Department, Cooper Tire & Rubber Company, Findlay, Ohio 45840 or call 1-800-854-6288. If you wholesale tires to other dealers (sub-dealers), each should receive a copy of this Service Bulletin.
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ED#4: 3/17/14


2011 335i 6 SPD M-Sport CWP CA HK ETTE Laguna Blue
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2008 535Xit Slush Box Prem Sport HK CWP CA Monaco Blue
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http://picasaweb.google.com/Rich8566...ueFebruary2008

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http://picasaweb.google.com/Rich8566/335iEDAugust2007
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