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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 08-13-2007, 10:05 PM
Bimr2nr Bimr2nr is offline
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Location: Michigan
 
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Mein Auto: 1995 325is
getting new wheels need some help

I have a 1995 325is automatic 2door.

I need to know a few things.

1) What size rims do i get for my car (and what size tires)

2) If i get thinner tires, what size rims can i fit on my car then?

I need all sizes please, width and all that crap. ty.

Also, any recommendations for somebody on a 800$ budget for it all?
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  #2  
Old 08-13-2007, 10:54 PM
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E36 Phantom E36 Phantom is offline
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Well, the larger the wheel, the smaller the tire.

The idea would be to keep your rolling circumference and overall wheel+tire diameter as close to stock as possible.

Personally, I think 17" fits the look of the car perfectly. 18" and up just doesn't do it for me. So, first off, figure out how big you wanna run. I don't think you can really do 19" on a decent size sidewall without rolling the fenders, but I don't know.

So, first off calculate the overall wheel+tire diameter of the stock combo.
Stock is 205/60/15. In case you don't know, the first number (205) is the tread width in mm. The next is the percentage of the width that the sidewall is high (ie the sidewall height is 60% of the tread width). The last is the rim diameter.
So, take the sidewall height:
205mm * .6 = 123mm is the sidewall height
Multiply by 2 since the sidewall is measured twice:
123 * 2 = 246mm
Convert the rim to mm:
15in to mm = 381mm.
Add the sidewalls and rim:
246mm + 381mm = 627mm TOTAL DIAMETER

Now, if you get a 17" wheel, and I think a good width to run is 235mm tires, run out the calculation backwards.
17in to mm = 431.8mm
627mm - 431.8 = 195.2
195.2 / 2 = 97.6mm
So, 97.6 is roughly 41% of 235, so optimum size is 235/40/17

Now, if you're lowered, that may actually be too wide, at which point you may want to run something like 215/45 or similar to avoid rubbing. Otherwise, that should be fine.

Just do the same for whatever other size you decide on.
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  #3  
Old 08-14-2007, 12:00 AM
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bounzing_soulz bounzing_soulz is offline
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Mein Auto: 1996 bmw 328is
^ dag gum. dont make me do work. haha, but really... good explination, very helpful
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Old 08-14-2007, 12:04 AM
Conehead Conehead is offline
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Further more to Phantoms post, what you should do is look at whats on the car now, then, as Phantom has said, descide how big you want to go. !7'' is in my opinion the biggest I would go, but its your car.

Here is a website that calculates rolling distance and will help. The bit you need is about 1/3rd the way down the page and is headed TYRE SIZE CALCULATOR.

Just imput your current sizes and and it should give you a prety good idea.

Hope this helps

Cone
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Old 08-14-2007, 12:42 AM
Bimr2nr Bimr2nr is offline
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Mein Auto: 1995 325is
thanks guys, seems like that should help.
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