10-17-2013, 11:12 AM | #1 |
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18" Winter F30 ET37
25/40/18 18x8.5 x120 +37 offset
Someone plz confirm whether the above is a good fitment all around for 2013 F30 320i x-drive? Let know asap as Im about to pull the trigger Thanks |
10-17-2013, 12:00 PM | #2 |
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13mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 13mm
new wheels - 3% too small in overall diameter and speedo will be 3km/hr lower than it really is. This I would consider to be in the border line area, namely, the lesser front strut clearance. Therefore, if you can do a test fit before buying, then it's better. |
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10-17-2013, 01:32 PM | #4 | |
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Not sure if you mean 225/40-18 or 255/40-18?
255/40-18 is OEM size for F30, 225/40-18 will be 3% short. Quote:
8.5x18" ET37 will have 9mm less inner clearance and extend 3mm on the outside compared to OEM 8x18" ET34. If compared with staggered 18" M Sport, the rear will looks like a 10mm spacer on M Sport 400 wheels. |
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10-18-2013, 12:40 AM | #8 |
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Then my calculations are correct after all!
I still don't think 225/40-18 is an optimal choice, they are 3% shorter than OEM and will look a bit stretched on 8.5" wide wheels. However wider tires can give problems with front strut clearance. |
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10-18-2013, 07:20 AM | #9 |
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Damn, I checked with the seller the wheels are 18x8
Does it make a difference in the calculations above? (Also, how do you guys come up with the numbers? Is there a chart out there that explains all this?) |
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10-18-2013, 07:54 AM | #10 |
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10-18-2013, 10:05 AM | #12 |
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Correct!
The wheels will be fine since you have confirmed that they are 8x18", the only difference compared to OEM is 3mm in offset. That will be hard to notice. 225mm wide tires will fit better on 8" wheels aswell! There will be a speedometer error and the 40% tire profile (compared to OEM 45%) will increase wheel gap slightly. |
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10-18-2013, 02:02 PM | #13 | |
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Quote:
For winter tires, is it anything to worry about the minus 5% tire profile in terms of stability and security. I dont want to compromise security because of child in the car. Thanks |
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10-18-2013, 03:41 PM | #14 |
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Generally I would say that higher sidewall is better for a winter tire!
But the difference isn't that large: 225/40-18, sidewall hight 90mm 225/45-18, sidewall hight 101mm You find some good infomation about winter tires here: tirerack.com |
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