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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 12-01-2014, 06:15 PM
Bossman963 Bossman963 is offline
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Need advice on Tires sizes for a 525 Wagon

OK you Guru's I have a 2001 wagon 525 and wanted to get the good look style tires and the max size I can get.

I have on the car now 225x40x17 front and rear is 245x45x17 and they look like I have now tires at all and its kinda a rough ride.

So I'm looking for a smooth ride and a great look - Oh I have BBS style rims.

A tire guy said he could hook me up with BFG Riken 245x50x17 - any thoughts ???
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  #2  
Old 12-01-2014, 07:47 PM
Wgosma Wgosma is online now
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With 17" wheels on these cars you've got to run a fairly low-profile tire, so ride comfort won't be so cushy. I'm not familiar with the wagons bit I am guessing that the factory spec is to have the same rolling diameter on both front and rear wheels - with what you have now you don't have that happening, something to look into.

Performance/handling and ride quality are always trade-offs, they're in opposition to one another: higher performance generally means less comfort and vice-versa. There are more opinions on tires than their are members of this BMW forum.
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Old 12-01-2014, 08:08 PM
edjack edjack is online now
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Old 12-01-2014, 09:30 PM
Bossman963 Bossman963 is offline
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Ok thanks guys !
anybody else ?
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  #5  
Old 12-01-2014, 10:07 PM
bobdmac bobdmac is online now
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Quote:
Originally Posted by Bossman963 View Post
OK you Guru's
I have on the car now 225x40x17 front and rear is 245x45x17 and they look like I have now tires at all and its kinda a rough ride.

So I'm looking for a smooth ride and a great look - Oh I have BBS style rims.

A tire guy said he could hook me up with BFG Riken 245x50x17 - any thoughts ???
Your tire heights are messed up. The wider tire should have the lower profile so that both have the same overall height (or diameter). For instance, on my car, I have the stock-sized 235/45's in front and 255/40's in the rear on 17" rims. A taller profile in front, which takes the brunt of the impact, will go a long way toward making the ride more comfortable. I'm very happy with my ride, and my car is sprung slightly stiffer than yours.
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Old 12-01-2014, 10:08 PM
AV8R4AA AV8R4AA is offline
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I have michelins and 17 inch new discount tire wheels.
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  #7  
Old 12-02-2014, 05:22 AM
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Fudman Fudman is offline
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Quote:
Originally Posted by bobdmac View Post
Your tire heights are messed up. The wider tire should have the lower profile so that both have the same overall height (or diameter). For instance, on my car, I have the stock-sized 235/45's in front and 255/40's in the rear on 17" rims. A taller profile in front, which takes the brunt of the impact, will go a long way toward making the ride more comfortable.
+1, you have an incorrect tire size mix. 235/45-17 is the standard size tire for the 17" rim on the e39. This tire size/aspect ratio will yield a typical sidewall of about 105.75 mm or 4.16". Your 225/40 front tire has a sidewall of only 90 mm or 3.54". That 0.62" smaller sidewall difference is why your car has a rough ride. Your rear tires (245/45) have too big of a sidewall (110 mm or 4.34"), raising your rear end, improving your gas mileage but it probably screws up your handling characteristics. Those 245/50s BFGs will raise your car significantly as those sidewalls are 122.5 mm or 4.82". If you like the jacked up 4x4 look, go for it. However, unless you know what tire size you want/need, I would suggest you go with 235/45-17 all around. This is a good combination of ride, handling and appearance.
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Old 12-02-2014, 06:55 PM
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bmdubya1198 bmdubya1198 is offline
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Good place to start
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  #9  
Old 12-02-2014, 08:46 PM
Bossman963 Bossman963 is offline
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Thanks guys as I went with 235x50 and what a difference it made
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  #10  
Old 12-02-2014, 09:30 PM
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IndiansFan IndiansFan is offline
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Originally Posted by Bossman963 View Post
Thanks guys as I went with 235x50 and what a difference it made
You now have increased the overall diameter of your tire/wheel assembly by about 15/16" from OEM. This will increase the overall circumference, which in turn will affect your speedometer. You may be traveling a bit faster than the indicated speed.
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  #11  
Old 12-03-2014, 08:40 AM
Bossman963 Bossman963 is offline
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Thanks Indian fan as will check it out with my radar detector & GPS unit to see what the difference is
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  #12  
Old 12-03-2014, 12:40 PM
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Hi,

Lots of posts about running the correct sizes of tyres and some of the equivalent sizes and profiles as alternatives. As above, you're currently now running the wrong size profile and in addition to your speedo being off, you 'might' trigger the car's computer to shut the car down due to it not being able to read road wheel speed correctly which in turn will be affected due to the gearing being affected.

I'd suggest you run the correct sized tyres. If they're too harsh for you at 17 inch, consider going down to 16 or maybe even 15 inch wheels/tyres. If they turn out to be too harsh, buy one of those old USA cadlllacs ?

Cheers, Dennis!
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Old 12-03-2014, 01:44 PM
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For reference ...
- BMW wheel specs (1) (2) & BMW & replica rim styles (1) (2) (3) (4) & the difference between cast vs forged rims (1) & how to choose the right size wheel spacers (1) (2) & where to go when you bend or otherwise damage your wheels (1) & wheel terminology (1) & Tire circumference, diameter, offset, & clearance calculators (1) (2) (3) (4) (5)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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