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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 06-28-2007, 07:17 AM   #1
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Max tire width(ng900-og9-3)

So my roommate got a set of 245's for his MKIV GTI yesterday and it got me to thinking if I could run wider tires, and how wide could I go? This would obviously have some relation to wheel offset as well. I'm not sure what the offset on my wheels actually is. But they are the Mille Miglia rims size - 8J x 18H2. I am currently running 225-40-18's, but if I could run 235's or 245's next time I buy tires that would make a great difference in traction.

What is everyone else running?
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Old 06-28-2007, 07:23 AM   #2
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The big factor on an NG or 9-3 is whether or not you have rear wheel well cutouts. The 3 doors all have them and many of the 4 doors do as well, but its quite random as to which cars have them. If you look at the foward part of your rear wheel well, down towards the bottom, youll see a plastic cutout/insert there if you have it (exactly like is on all the Vigs'). Thats where wide tires will rub. Im running 225's on 17x8's wheels on my NG and they rubbed like a bastard on stock suspension. I ended up cutting out that section with a die grinder to solve the issue.
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Old 06-28-2007, 08:23 AM   #3
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215/55R16S I have found will rub the fuel filler tube.
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Old 06-28-2007, 09:43 PM   #4
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Probably won't make any noticable difference in traction if you go from 225 to 235 or 245.
The thing you WILL notice on the other hand, is that the car will certainly become much more "restless" ie pulling a lot more from side to side under acceleration and so forth.
And then there is the clearence issue. I run 235/35-19 on a 8,5" wide rim ET38 and they do rub a bit both front and back and I'm going to swich to 225 soon.
I would not change from 225/40-18, I think you will loose more than you will gain.
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Old 06-28-2007, 10:18 PM   #5
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It really depends on the offset.

I have run 17x8" rims with 225x45 tires made by TSW with a 35mm offset and got a significant ammount of rubbing in the rear, and now am running the 17" Klingons with the same size tires and due to haveing a different offset havent rubbed at all.

The general finding is that 225 is the best size to run.
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