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Wheel Offset Discussion Thread... How far can we go?

Ok, So I was on my350z today and I was trying to inquire about a set of Work Wheels. The response I got was that the 370z had no where

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Old 04-18-2009, 08:13 PM   #1 (permalink)
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Talking Wheel Offset Discussion Thread... How far can we go?

Ok, So I was on my350z today and I was trying to inquire about a set of Work Wheels. The response I got was that the 370z had no where near the same room in the wheel well as the 350z and that the wheels would not fit! I thought to myself riiiighttt.

So lets take a look at what we have to work with and how far we can go with offsets.

I want this to be an educational thread for everyone! No flaming as we are all here trying to spread our knowledge

So stock sport wheels are:

19 x 9 +47
19 x 10 +30

at stock camber this leaves us with about 3/4 inch of room to the outside of the rim and the inside of the fender on the rears and about the same for the fronts.

We have seen that 15mm spacers on the rears put the rims close to flush with a few mm's to spare. I believe the fronts could do the same...


So the real question is at what size and offset have we gone too far?
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Old 04-18-2009, 08:37 PM   #2 (permalink)
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Ok by my calculations if you want flush with 0-5mm extra room on stock alignment and you want to up your wheel width sizes here are your specs:

F 19 x 9.5 +39
R 19 x 10.5 +21 or 22

F 19 x 10 +45
R 19 x 11 +28

Last edited by bullitt5897; 04-18-2009 at 08:43 PM. Reason: missed a calc step
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Old 04-18-2009, 08:46 PM   #3 (permalink)
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I think 9.5 30mm, 10.5 15mm would look good, give or take a few mm. I have seen front 10.5 22mm, but with a lot of negative camber.

"Filling the guards was a set of fat and nicely offset SSR TypeF 19″ wheels. A whopping 10.5 inches all round with +22mm front, and +15mm rear offsets. Stretched over these were ADVAN Neova tires in 255/35 and 275/30 sizes."
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Last edited by azn370z; 04-18-2009 at 08:49 PM.
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Old 04-18-2009, 08:49 PM   #4 (permalink)
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R 19 x 11.5 +34
R 19 x 12 +56
R 19 x 12.5 +62

These sizes and offsets are taking into assumption unlimited room toward the inside of the wheel...

If anyone wants to double check these numbers that would be great!
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Old 04-18-2009, 08:52 PM   #5 (permalink)
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Quote:
Originally Posted by azn370z View Post
I think 9.5 30mm, 10.5 15mm would look good, give or take a few mm. I have seen front 10.5 22mm, but with a lot of negative camber.

"Filling the guards was a set of fat and nicely offset SSR TypeF 19″ wheels. A whopping 10.5 inches all round with +22mm front, and +15mm rear offsets. Stretched over these were ADVAN Neova tires in 255/35 and 275/30 sizes."
Good Observation!!!

The next step for us is to see how much camber is needed to move x amount of extra mm's inside the wheel well... I hope that made sense
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Old 04-18-2009, 09:13 PM   #6 (permalink)
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Stock Front Alignment:


Stock Rear Alignment:


So the question is which Camber setting do we use as the actual camber?
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Old 04-18-2009, 09:17 PM   #7 (permalink)
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LOL I figured it out
With the front wheel at:
/ = highest suspension travel point: -1.41 degrees
l = Sitting: -.67 degrees
\ = Fully decompressed suspension: .41 degrees

With the Rear wheel at:
/ = highest suspension travel point: -2.16 degrees
l = Sitting: -1.67 degrees
\ = Fully decompressed suspension: -1.17 degrees
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Old 04-18-2009, 10:59 PM   #8 (permalink)
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does anyone know the formula or a calculator to find out how "x" degrees of camber induces a "x" amount of tire position change?
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Old 04-18-2009, 11:26 PM   #9 (permalink)
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Using trig. I figure that for our stock alignment the top of the rims sit from zero:
Front:
/ = 5.92mm inward
l = 2.79mm inward

Rear:
/ = 9.14mm inward
l = 7.11mm inward
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Old 04-18-2009, 11:30 PM   #10 (permalink)
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now we take into account for tire sizes:
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Old 04-18-2009, 11:41 PM   #11 (permalink)
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using stock tire sizes on the "new rim sizes" here are the new stock camber positions:
Front:
/ = 8.38mm inward
l = 3.96mm inward

Rear:
/ = 12.91mm inward
l = 9.42mm inward
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Old 04-18-2009, 11:58 PM   #12 (permalink)
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From Zero Camber this is the amount of change you can expect to see with stock tires.

Front camber positions at full / :
@ 2 degrees: 11.83mm inward
@ 2.5 degrees: 14.78mm inward
@ 3 degrees: 17.75mm inward

Rear camber positions at full / :
@ 2.5 degrees: 14.12mm inward
@ 3 degrees: 16.94mm inward
@ 3.5 degrees: 19.76mm inward

Last edited by bullitt5897; 04-19-2009 at 04:05 PM.
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Old 04-19-2009, 01:14 AM   #13 (permalink)
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well,right now i drop on Tanabe coil over all the way down,about 2 1/2 front 2 1/2 rear.
Camber is super carzy,look like -2.5 front,-2.0 rear.
I did a 20x9.5et20+20x11 et21 already and there is still so much more room.
This is the set i'm going to be doing i 1 week when i get my car back from doing a body kit.
20x9.5et10+20x12et28 Venaci VS124


I'LL POST SOME PICTURES SOON
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Old 04-19-2009, 01:36 PM   #14 (permalink)
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Are those the only wheels you have? They are on like every single one of your cars. I looked up venaci wheels and I couldn't find a website or anything. Obviously it comes down to taste and what not. I really don't like those wheels. What I do appreciate is you testing out sizing, thats such valuable information regardless of whether you are all go or all show. Thanks VIP.
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Old 04-19-2009, 04:12 PM   #15 (permalink)
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-2.5 & -2 is not that extreme but it is up there. Thats some seriously good news

any other vendors want to chime in?
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