tire rack help

02m3project · 12-15-2009, 05:34 PM

I need help determining the correct tire size for my 325i. I bought a 2006 325i without sport package. It has stock 205/55 16 tires. I bought 20 inch Moda wheels from Tire Rack, but haven't gotten the tires yet. The website recommended 245/30 20 in front and 285/25 20 rears. I checked the calculations and the recommendations seem to be about an inch taller than the stock tire. Shouldn't I go with a 225/30 20 and 255 25 20 in the rear? The wheels are 20 by 8.5 and 9.5 (both ET 32).

Also, I bought a second set of the same rims for my e46 M3 (2002 vert). These wheels were not recommended from the site to fit my M3, but I fit them without tires when I got my first set last night (which caused me to order a second set). I noticed that the 19s I had on there now are also 8.5 and 9.5, but the front is ET40 and the rear is ET20. The rear seemed to have about 2 fingers on the inside of the wheel well at the closest point, so I assume they will fit with tires. The fronts seemed to have room also, but I didn't turn the wheel to see if there would be a problem. I did lower my car a little. I have Koni SA Sports with H&R adjustable springs. Why did Tire Rack website not recommend these wheels (20 by 8.5/9.5 ET 32) for my e46? What should I be aware of when trying to install?
Thanks.

remmib · 12-15-2009, 06:02 PM

There's no such thing as 255/25/20. Smallest is 285/25/20 from most tire brands, I've seen Dunlop make a 275/25/20 though.

02m3project · 12-16-2009, 08:09 PM

So if I understand you correctly, Tire Rack recommends 285/25 because they don't make the correct size for the e90? Does anyone correct the tire size in the computer then?

GreenPlease · 12-16-2009, 08:36 PM

I have to say: avoid 20s. Other than that, Remmib is spot on re sizes.

02m3project · 12-18-2009, 12:20 PM

Quote:

Originally Posted by GreenPlease

I have to say: avoid 20s. Other than that, Remmib is spot on re sizes.

Any reason for this? I am guessing because of weight and tire selection, but your statement was pretty generic.

12-15-2009, 05:34 PM	#1
02m3project Private First Class 6 Rep 100 Posts Drives: 02 M3 Imola Red Vert Join Date: Jun 2009 Location: South Beloit iTrader: (3)	tire rack help I need help determining the correct tire size for my 325i. I bought a 2006 325i without sport package. It has stock 205/55 16 tires. I bought 20 inch Moda wheels from Tire Rack, but haven't gotten the tires yet. The website recommended 245/30 20 in front and 285/25 20 rears. I checked the calculations and the recommendations seem to be about an inch taller than the stock tire. Shouldn't I go with a 225/30 20 and 255 25 20 in the rear? The wheels are 20 by 8.5 and 9.5 (both ET 32). Also, I bought a second set of the same rims for my e46 M3 (2002 vert). These wheels were not recommended from the site to fit my M3, but I fit them without tires when I got my first set last night (which caused me to order a second set). I noticed that the 19s I had on there now are also 8.5 and 9.5, but the front is ET40 and the rear is ET20. The rear seemed to have about 2 fingers on the inside of the wheel well at the closest point, so I assume they will fit with tires. The fronts seemed to have room also, but I didn't turn the wheel to see if there would be a problem. I did lower my car a little. I have Koni SA Sports with H&R adjustable springs. Why did Tire Rack website not recommend these wheels (20 by 8.5/9.5 ET 32) for my e46? What should I be aware of when trying to install? Thanks.
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12-15-2009, 06:02 PM	#2
remmib General 1569 Rep 29,202 Posts Drives: 2013 F10 520d M-Sport Join Date: Feb 2006 Location: Norway iTrader: (0)	There's no such thing as 255/25/20. Smallest is 285/25/20 from most tire brands, I've seen Dunlop make a 275/25/20 though. __________________ F10 520d M-Sport Alpine White \| HRE P43SC 20x9+20x11 \| Michelin PSS 255/35+295/30 \| KW V3 Coilover \| M5 Front Sway Bar + M550d Rear Sway Bar \| 3DDesign Front Lip \| BMW M Performance CF Spoiler \| BMW M Performance Diffuser \| BMW M Performance Black Grills \| BMW M Performance Pedals \|
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12-16-2009, 08:09 PM	#3
02m3project Private First Class 6 Rep 100 Posts Drives: 02 M3 Imola Red Vert Join Date: Jun 2009 Location: South Beloit iTrader: (3)	So if I understand you correctly, Tire Rack recommends 285/25 because they don't make the correct size for the e90? Does anyone correct the tire size in the computer then?
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12-16-2009, 08:36 PM	#4
GreenPlease Lieutenant Colonel 129 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	I have to say: avoid 20s. Other than that, Remmib is spot on re sizes. __________________ Cars>Women
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