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  #1  
Old 10-01-2013, 12:20 PM
bdonkersgoed bdonkersgoed is offline
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Question Non-Staggered Tires on Staggered BMW Style 189 wheels?

Hello,

Sorry, this may be a stupid question. I have a set of staggered BMW Style 189 wheels that currently have Michelin PS2 Runflats installed with the following sizes:

P255-35-18 -- REAR
P225-40-18 -- FRONT

Would I be able to mount a non-staggered tire setup on these rims? I am thinking of Dunlop 5000 DSST in the following size:

P245-40-18 -- FRONT AND REAR

Thanks!
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  #2  
Old 10-01-2013, 12:45 PM
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Keepittrill Keepittrill is offline
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Non-staggered Tires on Staggered BMW Style 189 Wheels?

If you stretch the tire, sure. But you don't want to stretch tires. Run the size the rim fits.


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  #3  
Old 10-01-2013, 03:37 PM
bdonkersgoed bdonkersgoed is offline
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No, I don't want to be stretching, so I'll try to find another set. Thanks!
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  #4  
Old 10-01-2013, 04:56 PM
Norm37 Norm37 is offline
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You might be able to? tires have a minimum and maximum rim width fitment.

example:

The SP Sport 5000M DSST CTT size 245/40/18 will fit rim widths between 8.5-9.5"

Check with tire rack for the rim widths on your wheels.

Last edited by Norm37; 10-01-2013 at 05:15 PM.
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  #5  
Old 10-01-2013, 06:53 PM
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pointandgo pointandgo is offline
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Quote:
Originally Posted by bdonkersgoed View Post
Hello,

Sorry, this may be a stupid question. I have a set of staggered BMW Style 189 wheels that currently have Michelin PS2 Runflats installed with the following sizes:

P255-35-18 -- REAR
P225-40-18 -- FRONT

Would I be able to mount a non-staggered tire setup on these rims? I am thinking of Dunlop 5000 DSST in the following size:

P245-40-18 -- FRONT AND REAR

Thanks!
According to the (U.S.) Tire and Rim Assn. Yearbook (specs) the P245/40R18 would be more than a half inch taller in overall diameter (0.63"). Why on earth would you want to do this?
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  #6  
Old 10-01-2013, 07:05 PM
Norm37 Norm37 is offline
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Quote:
Originally Posted by pointandgo View Post
According to the (U.S.) Tire and Rim Assn. Yearbook (specs) the P245/40R18 would be more than a half inch taller in overall diameter (0.63"). Why on earth would you want to do this?
True but the sidewall height (rear tire difference) is only .35" higher. Which is not that bad IMO.

http://www.discounttire.com/dtcs/infoTireMath.dos

Last edited by Norm37; 10-01-2013 at 07:07 PM.
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  #7  
Old 10-01-2013, 08:07 PM
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pointandgo pointandgo is offline
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Quote:
Originally Posted by Norm37 View Post
True but the sidewall height (rear tire difference) is only .35" higher. Which is not that bad IMO.

http://www.discounttire.com/dtcs/infoTireMath.dos
Your opinion is wrong. According to the Discount Tire website, the OP's tire would be even taller...0.70" taller.
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Old 10-01-2013, 09:55 PM
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Why do we have TWO threads for the same subject...from the same OP? Moderator...please combine.
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E90 328i
E92 335i 6MT
E46 M3 6MT
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MBz W140 S320
MBz W124 300E (slammed)
(unmentionables in between)
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'67 Pontiac Firebird 'cabrio' (1st car - "the leaker")
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  #9  
Old 10-02-2013, 08:29 AM
Norm37 Norm37 is offline
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Quote:
Originally Posted by pointandgo View Post
Your opinion is wrong.
Opinions differ.
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  #10  
Old 10-02-2013, 07:15 PM
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BB_cuda BB_cuda is offline
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Fair enough,opinions can differ. I will give you that. The math on tires is a differet story. It is fairly cut and dried.

245/40R18 diameter=25.72"
225/40R18 diameter=25.09"(-.63")
255/35R18 diameter=25.03" (-.69")

So, you are wanting taller tires. Why is this? I would be concerned with tire rubbing. I remember a thread where guys were switching to 19" M3 wheels along with using 235/35R19 front and 275/30R19 rear. Folks that had a 335i (oil cooler grill in forward wheel well) spoke of tire rubbing on that grill. Those 19 tires specs are coming in at 25.5" diameter and you're another .22" larger with this idea. People that did this with coupes seem to fair better though.

I've seen your suggested setup on a new Audi S5 and they look meaty. I think this might not be a good idea. But as you say this is my opinion.
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Old 10-02-2013, 08:41 PM
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Nordic_Kat Nordic_Kat is offline
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Quote:
Originally Posted by pointandgo View Post
Why do we have TWO threads for the same subject...from the same OP? Moderator...please combine.
Fixed. Thanks for the call to attention.
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  #12  
Old 10-02-2013, 10:00 PM
Norm37 Norm37 is offline
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Quote:
Originally Posted by BB_cuda View Post
Fair enough,opinions can differ. I will give you that. The math on tires is a differet story. It is fairly cut and dried.
True!

I was just stating for the OP bdonkersgoed the sidewall height (rear tire difference) is only .35" higher. Which is not that bad IMO.

pointandgo Said my opinion was wrong. I replied to him that opinions differ.

pointandgo Did not substantiate his statement with any facts: like he tried it and their was rubbing.

The math:

245/40R18 diameter=25.72" is + .69" overall diameter to stock tires. But the sidewall height is only + .35" so that is how much closer the tire is to the wheel well. Only half the additional diameter increase of .69".

I also gave a link to the tire calculator so that bdonkersgoed could check the math for himself and the increase in speed from what the speedometer will show.

IMO I doubt if there would be any rubbing. A quick look at the wheel well and his tires would give bdonkersgoed an idea if .35" closer to the wheel well would be ok for the new size tires.

Now if your opinion is The math on tires is a different story. It is fairly cut and dried and you must stay with the exact size tires as stock that's fine.

My opinion is a small difference in size is ok. The winter tires I wanted on my Rav4 did not come in stock size. So I went with a size that is a +.25" increase in sidewall height. The tire rack rep said they would be fine.

+.25" I felt comfortable with on my Rav4, +.35" would probably be the max increase I would consider.

Also in my first reply I said check with tire rack. They would be the ones to make the final decision on all the things bdonkersgoed asked about.

Last edited by Norm37; 10-03-2013 at 12:36 AM.
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  #13  
Old 10-03-2013, 05:33 AM
Norm37 Norm37 is offline
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Ps.

Quote:
"The math on tires is a different story. It is fairly cut and dried."
Then tire manufactures would have to design a tire that never wore down the treads.

A new tire with 10/32nds" of tread, wears to the legal limit of 2/32nds" of remaining tread. That is a loss of 8/32" of sidewall height.

8/32nds" = 1/4" sidewall height. or 1/2" overall loss of dimension from new to when it is legally worn out and must be changed.

So their is some leeway in tire dimensions that a car can deal with.

Increasing the sidewall height 1/4" on my Rav4 was ok and this was confirmed by the tire rack rep when I purchased my tires.

The +.35" sidewall height for bdonkersgoeds tire would probably be close to the maximum increase allowed. But then again a tire rack rep might say that is to much.

Then my opinion would be wrong.

Last edited by Norm37; 10-03-2013 at 06:34 AM.
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