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E34 (1989 - 1995)

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  #1  
Old 05-04-2012, 12:15 PM
Gravik Gravik is offline
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Tire question

So currently I have 18" staggered wheels. 18 x 8.5 front, 18 x 9.5 rear. What would be the widest tire I could comfortably fit on the rear wheels? Currently have 265's
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  #2  
Old 05-04-2012, 12:33 PM
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Monsignor Monsignor is offline
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My buddy has a rece prepped s197 mustang and he has 305 R-comps on 10" wide and theyre a bit beefy.
with 9.5 i would say you could do 285 or possibly 295 depending on how much bulge you're comfortable with. But at that point, the restricting factor would be what size tire even fits in the wheel well. There plenty of room in there but 295s are big fat fatties.

Measure how much room you have between the tire and the shock and the tire and the body. the width of the tires is simply the mm. a 265 for instance would be approx 265mm wide. the combined distance you have between the tire and the car would be how much bigger you could go up to and including the limit of width you can fit on the rim. Personally, if those weremy wheels and my car, I'd go 285s.
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  #3  
Old 05-04-2012, 01:08 PM
Gravik Gravik is offline
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Yeah. when I get a mustang next summer, I'm gonna run 315's in the rear. Gotta love the look of fat rear tires.

I feel that if I were to go any wider on the Bimmer, I'd probably need to roll the fenders. Or would wider tires fit without any fender rolling?
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  #4  
Old 05-04-2012, 02:00 PM
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Monsignor Monsignor is offline
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Quote:
Originally Posted by Gravik View Post
Yeah. when I get a mustang next summer, I'm gonna run 315's in the rear. Gotta love the look of fat rear tires.

I feel that if I were to go any wider on the Bimmer, I'd probably need to roll the fenders. Or would wider tires fit without any fender rolling?
Thats why you'd have to measure. are you lowered? rolling isnt a big deal. mines rolled...

In my opinion 265 is plenty...
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  #5  
Old 05-04-2012, 07:20 PM
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Rolling? If you're serious about width, go tubbed.

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  #6  
Old 05-04-2012, 08:32 PM
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Originally Posted by Radian View Post
Rolling? If you're serious about width, go tubbed.

OMG

Gravik, one important thing you need to keep in mind is wheel offset. fender roll will add clearance on the outer but you may require spacers for inner clearance. And be mindful not to exceed the recommended rim width of the tires you purchase. Tires that are two wide for the rims stand a good chance of coming off the wheel in a side slide.

That being said...

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  #7  
Old 05-05-2012, 08:09 AM
snowsled7 snowsled7 is offline
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Originally Posted by CarDriver View Post
And be mindful not to exceed the recommended rim width of the tires you purchase. Tires that are two wide for the rims stand a good chance of coming off the wheel in a side slide.
That is simply not true. Tires too wide for the rim have issues but, coming off the rim is not one of them. Poor wear characteristics, and the funny fat tire on a narrow rim "look" are consequences but unless you get really carried away it isn't a problem.

I might expect the opposite was true. Those guys that like to stretch narrow tires onto wide rims might want to be mindful of your warning.
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  #8  
Old 05-05-2012, 08:38 AM
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^any time you fit an improper size tire on a rim, you run risks of the bead unsettling.

Biggest danger with stretch:
Poor tire wear
Sidewall vulnerable to road debris and damage
Loosing a tire

Biggest danger with bulge:
Poor tire wear
Sidewall flex in hard cornering/driving

The race tires I had on my 350z were 255width on a 7" rim. It had a good amount of bulge but it was entirely useable. I learned how to race it compensating for the minor sidewall flex.
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  #9  
Old 05-06-2012, 09:19 AM
snowsled7 snowsled7 is offline
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Quote:
Originally Posted by 95 E34 View Post
^any time you fit an improper size tire on a rim, you run risks of the bead unsettling.


The race tires I had on my 350z were 255width on a 7" rim. It had a good amount of bulge but it was entirely useable. I learned how to race it compensating for the minor sidewall flex.
Just a bit of condratiction there....

Obviously the 255 section tire was never reccomended for a 7 inch wide rim. The fact that you raced the car with such a disparity sort of negates the notion that the wide tire is going to come off the narrow rim, no?

Tire wear is the biggest issue, as mentioned, when fitting odball wheel/tire combo's. I just didn't want people getting the impression that there was some danger to fitting tires a couple of sizes either way in reccomended rim widths, because there is not.
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