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The Tire Rack's Tire & Wheel Forum
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Old 04-24-2012, 09:32 PM   #1
dayusmc
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245/40 18 on 18x8 35mm offset all 4?

Wondering if anyone knows if 245/40 18 on 18x8 35mm offset will fit on front and back of 2000 323ci with stock suspension without rubbing? I have 245/40 17 on stock rims on my wife's 2006 325ci without rubbing. I know the overall diameter of the 245/40 18 is 25.7 verse 24.7 on the 245/40 17. Or would a 255/40 18 fit all the way around with 8inch 35mm offset? Thanks for any info!!
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Old 04-25-2012, 03:21 AM   #2
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Wouldn't rub but would look too tall and throw your speedo off by too much. You want 225/40 tires for those 18s or 235/40
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Old 04-25-2012, 06:46 AM   #3
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I think stock on an 05 M3 was 225/45-18 & 255/40-18 Both have a 26" diameter, the 245/40-18 has a 25.7" diameter. So it wouldn't even be as tall as a stock m3.... I live in NJ and there are a lot of pot holes and roads are bad.
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Old 04-27-2012, 02:25 PM   #4
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That is an M3, you're not driving an M3. Speedo will be off by more than legal limit. They will fit and you will not rub, but I wouldn't like the look of it. Get 235/40. You don't need the grip from a 255 and it'll look ghey as fvck. Balloons
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Old 04-27-2012, 02:28 PM   #5
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Couldn't I get the computer reprogramed for the new tire size so the spedo is right?

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Old 04-27-2012, 09:10 PM   #6
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Do you already have these tires or something? If not don't bother, you won't notice the difference between a 235/40 and a 255/40 in ride quality, your speedo will be right, and the tires will cost less.

Not sure if BMWs can be reflashed for tire size variance. I'm a Ford mechanic.
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Old 04-28-2012, 09:17 AM   #7
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I have 255/40 18 rears on another set of M3 rims. I put them on the back and liked the way it filled the wheel well. They are 26" diameter.... the 245/40 18 is 25.7 so it is almost the same. On my wifes car I have 245/40 17s and they are 24.7 I think they look a little small....
That is why I was thinking about the 245/40 18s for my car. I just bought a set of 18x8 35mm style 67s because the M3 rims and tires I bought looked a little wide on the back...

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Old 04-28-2012, 12:37 PM   #8
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Regardless they are too big, and you will be going faster than your speedo reads. And ignorance is not a defense in court should you decide to fight tickets. Me, I think that much rubber looks dumb. Better to use the right size and drop your car some to achieve the "look" you want than to fit balloons on a car at stock ride height and have the speedo innacurate.

I'm done with this thread by the way. Hope I've helped. Doesn't seem like I'm getting through to you though so time to give up.
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Old 04-28-2012, 01:00 PM   #9
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Thanks. I plan on having the computer reprogramed to fix the spedo
I wasn't looking for opinions on how it would look, only if they fit. I like the look of the filled wheel well. I live in NJ, so I wouldn't ever drop my car- roads are to bad....

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Old 05-08-2012, 02:17 AM   #10
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You cannot have the computer programmed to fix the speedo. Yes you can probably fit them in there but they may rub here and there and they are an entire inch taller than stock specification tires. That's way too tall. Would look weird too.
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Old 05-08-2012, 05:19 AM   #11
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.7 inch bigger then stock. They look pretty good, fills the wheel well pretty nice.
How can the speedo be corrected? On every other car I have owned they was a way to correct the speedo. Most of them it was in the computer, some it was a little gear...

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Old 05-08-2012, 06:32 AM   #12
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Your car will feel really slow if you throw those on the back. Going with a much taller tire is like gearing your car up.
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Old 05-08-2012, 06:36 AM   #13
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.7 taller should not make a big difference ...

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Old 05-08-2012, 09:27 AM   #14
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You'll probably rub. It's a tall and wide tire. 18x8.5" ET40 and you'd probably be okay- but I think the combination of width and height will be too much.
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Old 05-08-2012, 11:50 AM   #15
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Actually someone one here pm'ed me. He ran 245/40-18 and said the fit no problem. Even though the advertise et for my rims was 35. When they came in the box said et38

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Old 05-08-2012, 12:51 PM   #16
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The tire itself will fit. I am concerned about the rim choice with the tire. What width and offset wheel was he running?
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Old 05-08-2012, 01:07 PM   #17
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18x8 et38 style 67

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Old 05-09-2012, 09:46 AM   #18
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I would love to go with a 25 diameter tire, but I wanted 245 wide... not sure if there is a 245/35-18 or anything like that....

Kyle
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Old 05-31-2012, 06:05 AM   #19
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I just put a set of Khumos Estra 4x 235/45-18 (section width 9.5 & tread width 9.0) on a set aftermarket m3 rims et38. It looks OK, but they do look a little thin. I would say that maybe a tire with section width of 10.0 & tread with of 9.4 would have looked a lot better ....
I might get a bigger tire for the oem m3 rims et47 for my car... I will post some pics up this weekend after I wash the car :-)

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Old 05-31-2012, 12:09 PM   #20
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I would recommend a 225/40 or a 235/40 tire.
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