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offset question...

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Old Oct 25, 2005 | 01:48 AM
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offset question...

VOLK RACING TE37 [ F 19 X 8.5J +22 R 19 X 9.5J +34 ]

I'll be purchasing some new volks soon and was wondering why the offset in the front is lower then the offset in the back? to my understanding (which is very little) the lower the offset the wider the lip...

so would that mean on the +Ings rx8 with the te37s have a 22 offset in the front and a 34 in the back?

first of all would these offsets even fit on my car? would i have to roll my fenders with these exact offsets? I am planning on getting these exact wheels in these offsets and specs.

Any help will be greatly appreciated :D THanks
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Old Oct 26, 2005 | 03:48 AM
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take in consideration the width of the rim as welll..
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Old Oct 26, 2005 | 04:51 AM
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I ordered a set of CE28N's a few weeks ago... same size width rims your looking at getting... I got a +40 8.5 (+16mm out from stock)for the front and a +47 9.5 (+22 mm out from stock) for the rear. Should fit under the stock fender/qtr panels ok with that size. I actually measured from the stock rim to the body and adjusted offset to fit because everywhere I looked I was seeing way different offsets, some of them that had to have had body work and fender rolling or even fairing to fit. My wheels won't be here for another 2 weeks, but if you want to wait I can get back to you on the fitment when they arrive...

Last edited by Dragonfc3s; Oct 26, 2005 at 04:54 AM.
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Old Oct 26, 2005 | 08:55 PM
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any help? would these offsets fit my car with or without the need to roll my fender??? thanks!
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Old Oct 26, 2005 | 09:03 PM
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wow.... with those offsets you would DEFINATELY need to roll fenders ...


you're coming out 34mm and 35mm resepectively out from stock... that is WAY too much...

coming out ~25mm is the furthest i have seen without rubbing...

hope this helps..
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Old Oct 26, 2005 | 10:05 PM
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From: So. King Co.
+1
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Old Oct 27, 2005 | 03:06 AM
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So as a rule of thumb the way offsets work is they are relative to width. If you were to convert offset and width into frontspacing and backspacing you would understand what I mean.

An example:

RX8 stock wheel:
18x8 +50

That means 50mm from the 0 offset mark. At 0 the middle of this wheel measures say 4" on the front side and 4" on the backside. Now if you shave 50mm off of that you will lose 2" on frontspacing because it pushes in the wheel further, while gaining 2" on the backside. That means 2" front spacing and 6" backspacing.

Now backspacing and frontspacing isn't calculated this way as there is an edge/lip to the wheel that is not taken into consideration of a wheels width. The 8" is measured from the inside of the lips of the barrel, rather than the outside. THis is why the "total spacing" of a wheel is going to be wider than say 8", usually about 9.25" to 9.5". Lip is about 0.75" thick. I've eliminated this variable from the example simply because it is a constant and doesn't help to illustrate the concept.

So now I'd say a 19x10 +50 with a 275/30/19 and 0 degrees of camber will fit the RX8 perfectly with stock unrolled fenders. I'm running a +45 10" but 2.5 degs camber and no rubs. This 10" +50 equates to 3" front spacing and 7" of backspacing, hypothetically. Now the stock wheel only had 2" front spacing, now I got 3". That's 25.4mm, but the offset only changed 5mm. So that's kinda my lamen version of an example.

If I were to get an 8" +50 to sit in the same spot, close to the fender, as a 10" +45, it would actually be a 8" +25 wheel. Remember that everytime you add to the width, half of it goes to the inside and the other half to the outside. You guys should be able to fill in the gaps I hope.

From the wheel fitment measurements I have taken it looks like the most aggressive fitment without fender mods would be a 19x9 +42 and a 19x10 +50. Or in terms of 8.5 and 9.5, 8.5 +38 and 9.5 +44. Of course this will now depend on the actual section width of your tire. For example Bridgestone S03 in the same size as a Toyo T1S will measure wider.

There are shortcuts, easy to do in your head once you get the idea down. Maybe draw it on paper.

Rishie

Last edited by Endless Rotaries; Oct 27, 2005 at 03:11 AM.
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Old Oct 27, 2005 | 03:14 AM
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I have some Gunmetal CE28N 19" that we're completely blowing out at an insane price. If you'd like these over your TE's I can guarantee you a spanking deal. You're in Socal and deals are dime a dozen but I will definitely try.

Rishie
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Old Oct 27, 2005 | 04:15 AM
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http://www.1010tires.com/WheelOffsetCalculator.asp

This is my favorite wheel offset calculator... Just remember the stock wheel size is 8J x +50mm offset and them plug in the #'s for the wheels your thinking about and it will tell you the distance in mm's the wheel will go in the in and out direction...
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