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Old 01-28-2004, 05:28 PM   #1
Baab's Rex
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Default Superleggera 17X7 5X100 45mm offset

Will these fit a MY04 WRX wagon or is the offset incorrect? Thanks!
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Old 01-28-2004, 07:38 PM   #2
Peaty
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Do they come in 45? I just got a set and they are 48. This is a pic of my OZ superlegs. Also I thought the WRX was +53?


Last edited by Peaty; 01-29-2004 at 09:18 AM.
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Old 01-29-2004, 09:04 AM   #3
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that offset is wrong .... get the 48mm version
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Old 01-29-2004, 11:09 PM   #4
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I have the OZ SLs that I bought from the Tire Rack and I am still convinced that I should of gotten Prodrives. The OZs are the incorrect Subaru offset. The proper offset is a 53mm. The 48mm will fit....but it isn't ideal.
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Old 01-29-2004, 11:24 PM   #5
Peaty
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That depends, it's the proper offset for a Subaru Forester or Outback (Legacy based one) But you are right won't a 48 on something that is supposed to take a 53 put the tire closer to the strut?
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Old 01-29-2004, 11:31 PM   #6
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no, lower offset=farther to the outside, not inside
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Old 01-30-2004, 12:19 AM   #7
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The correct offset varies according to wheel design and wheel width...a +48 on a WRX is perfectly fine and will not cause any ill effects at all. We have many customers running +45 and some a bit lower (on 8.5 inch widths) that do tons of track days and street usage, and have had zero wheel bearing issues. It's all about how the load is transfered across the wheel.
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Old 01-30-2004, 09:37 AM   #8
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Z1 Performance,
Give up....I've been trying to explain that for a long time, BUT folks don't believe it : http://forums.nasioc.com/forums/show...hreadid=385857

Also, I believe the correct stock offset, ie, on 2002 WRX sedan with 6.5" wide wheel is actually 55mm, not the 53mm everyone keeps referring to....

I run 48mm 7x17 OZ's and 50mm 7x17 Team Dynamics.....
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Old 01-30-2004, 09:46 AM   #9
Peaty
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Sorry, I always get that backwards

The Service Manual seems to indicate the Offset stays the same regardless of the wheel:



I was going by what EHobron said here:

Which was:

Quote:

The simple answer is that the offset should never change despite wheel width. Even a 10" wide wheel will have a +48 offset on your vehicle. It would never fit the car but suspension geometry would be correct if you could bolt it on. I'll explain geometry in a minute. That's where it gets a little more complicated.

Offset is relative to backspacing and wheel width. That's why it's so confusing.

For example, with both wheels having +48mm offsets, the back spacing on a 6.5" wheel is about 5 5/8" while the back spacing on a 7" rim is about 5 7/8". Additionally, a 7.0" wheel with a +42mm offset would have backspacing of about 5 5/8". Note the similarities and remember this for the last paragraph.

Offset is the distance between the centerline of the wheel and the mounting surface of the wheel. Positive offset occurs when the mounting surface is outward of the centerline of the wheel.

Suspension geometry in basic terms is determined by drawing a straight line from the center of the upper ball joint, through the center of the lower ball joint and down to the center of the contact patch of the tire. Since that line is rarely perfectly plumb, the wheel is OFFSET to make the contact patch of the tire sit in the correct position. The offset is determined by some crazy smart engineer with way too much education.

Since offset is calculated using the centerline of the rim, offset will remain the same regardless of wheel width.

One of the reasons problems occur when choosing wheels that are too wide is that backspacing is changing. In the case of high positive offset wheels as are used on most sport compacts, the backspacing increase is noticed more at the inward portion of the wheel. This is evidenced by rubbing on inner fender skirts, the sub-frame, or even on suspension parts in high negative camber applications.

Take some measurments. As long a you have at least 1/4" clearance from the innermost edge of your wheel/tire, you can choose a 7.0" wheel with a +48 offset. The 1/2" added wheel width will be divided equally to the inner and outer edges of the wheel. 1/4" on each side when compared to the stock wheel.

On the other hand, changing to a +42 offset would move the wheel outward 1/4" so the entire 1/2" width change would be noticed only on the outermost edge of the wheel. The result would probably be no clearance issues inside but parts wear "might" be increased.

Bottomline, I recommend you stay with +48mm offset on the 7.0" wheel.

I hope this helps reduce some of the confusion.

Good luck,
Eric

Last edited by Peaty; 01-30-2004 at 10:03 AM.
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Old 01-30-2004, 10:54 AM   #10
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Bri - I know man.......people love to argue, but rarely want to actually learnt he correct answers!
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Old 01-30-2004, 11:57 AM   #11
Peaty
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Myself I'm trying to understand how this works, I keep getting conflicting answers though. I understand when this is said:

Quote:
The correct offset varies according to wheel design and wheel width...a +48 on a WRX is perfectly fine and will not cause any ill effects at all.
But if that's the case why would the Service manual have the same offset for 3 wheel sizes?

I'm not trying to argue just understand. I read through the offset thread that's a sticky and it seemed to contain a lot of conflicting info.
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Old 01-30-2004, 12:24 PM   #12
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becuase as I said, it varies by wheel design and size....in that small of a width (6-7 inch) you have alot more range you can work with.....as you go wider, the specific offset range tends to get narrower and narrower
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Old 01-30-2004, 11:59 PM   #13
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I run the OZ SLs in the 48 offset too on my 03 WRX and have had no problems. In fact I contacted OZ and they said this rim in that offset was made specific for the Impreza's. It's been a year and no problems, DON'T believe the offset myth about these rims! Actually do and then less people will have them.

You'll be just fine. With the wagon I think though if you go with a 225/45 they will rub unless you roll the fenders, at least that's what I have heard.
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Old 02-19-2004, 01:32 AM   #14
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So would getting 225/45 be more ideal than 215/45 on the OZ SLs in a 02 Sedan?
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Old 02-19-2004, 11:35 AM   #15
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you can use either the 225 or the 215 on a sedan...both work great.
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Old 02-19-2004, 12:16 PM   #16
SilverJA
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^ Thanks. I'm leaning towards 225's as I think they probably look better and probably grip more too.
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Old 02-19-2004, 01:28 PM   #17
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np - let us know if you need a quote on these!
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