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Author Topic: Wheel Offset  (Read 18210 times)

Offline Arro

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Wheel Offset
« on: 01:17:41 AM / 06-Aug-09 »
A VERY common question on this forum is if a wheel will fit. The real concern isn't diameter, but OFFSET.

Offset is how we measure the center surface that mates with the hub.



Our wheels are a low positive offset. Most FWD wheels are a higher positive offset, and many oldschool RWD vehicles use a zero or even negative offset.

It's important to note that the stock wheels are +35. It's also important to know that in stock form, the stock wheels are sunk into the wheel well.

Generally a common size is 7" wide, zero offset. This usually fits nearly flush (maybe a milimeter or two over). With the rear suspension dropped some, the rear tires will easilly tuck in.

But another thing to note is that the fender lip on the front is not as far out as the fender lip on the rear. This is actually true of S13, S14, Z32, Z33, Z34, G35 sedan, and even 1G Z cars like the 240Z through the 280Z. What this means is that you can run wider wheels/tires in the rear and be flush.... what they call a "staggered" wheel set.

So how do you calculate the proper offset to get the best fitment?

Here is a handy calculator to do just that!

http://www.1010tires.com/WheelOffsetCalculator.asp

You input the specs of your wheels as they are now. You then input the specs of the proposed wheels. It gives you the extra depth and outside measurements. Go and grab the ruler and eyeball the shocks on the inside, and the fender lip on the outside.



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-Jason Arro


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'84 Nissan 200SX Turbo
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Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
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Offline brewster240

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Wheel Offset
« Reply #1 on: 01:44:49 AM / 06-Aug-09 »
i think this goes hand in hand with this:

http://www.miata.net/garage/tirecalc.html

Offline Arro

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Wheel Offset
« Reply #2 on: 01:46:21 AM / 06-Aug-09 »
Yeah, except that it doesn't show tire width vs. wheel to illustrate stretch vs. balloon... then again that fluctuates with brand and model of tires.
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline brewster240

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Wheel Offset
« Reply #3 on: 01:50:37 AM / 06-Aug-09 »
i just noticed you posted a calc in yours, i skipped over that somehow.

i guess delete mine if you want to clean this up.

wait, yours is an offset calc.

i guess thats a sign for me to go to sleep

Offline Maxpow

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Wheel Offset
« Reply #4 on: 02:28:07 AM / 06-Aug-09 »
I've got the best one hands down, been using it since I had the eclipse:

http://www.wheelsmaster.com/rt_specs.jsp
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Offline Micro S12

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Re: Wheel Offset
« Reply #5 on: 11:44:40 AM / 28-Sep-10 »
I´m thinking of getting a set of steelrims widened.
But I dont know how wide and what offset they should be when they are done.
Can anyone help me with what offset and dimensions i should order?
And what is the widest you can squese in?
Width:
Offset:

Were thinking of getting stretched tires for them later.

Offline Xano

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Re: Wheel Offset
« Reply #6 on: 04:29:07 PM / 28-Sep-10 »
there are people running 9" wide in the back i believe. and 8" in the front fits ok.

i know that my 7" 0 offset wheels poke out a tiny bit on the front, and are a tiny bit sunken in on the back.

So use that as you will. 
~xano


Offline Arro

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Re: Wheel Offset
« Reply #7 on: 05:12:02 PM / 28-Sep-10 »
You can run 9" wide tires in the back if your offset is no lower than -10. To run like that, you're gonna have to run a mad stretch with like 205 width tires in order to clear the rear quarterpanel lip. So what's the point?

All you really get for going with a 9" low offset wheel in the rear is more expensive wheels to buy, and screwing with the offset. Unless you're gonna run fender flares, stick with 8" max width and zero offset (which is more common and less expensive).

If you want to run wider, just don't go "hellaflush", and keep the offset closer to zero. Then you also get the advantage of running with wider tires.

Also, your ride height determins the angle of the suspension and thus how the tires will fit when flush. Keep this in mind.
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline Maxpow

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Re: Wheel Offset
« Reply #8 on: 06:28:33 PM / 28-Sep-10 »
Fender flares, -15(or more) offset, 315's in the back, 275's up front.


That would be hawt.
« Last Edit: 06:36:33 PM / 28-Sep-10 by Maxpow »
1987 Nissan 200sx SE ("The Squirrely Drifter") - Totaled and Gone forever
1987 Nissan 200sx SE ("The Weebly Wobbler") - Impounded and Gone forever
2007 Kia Spectra - Fantastic Daily Driver - Custom CAI, NGK wires/plugs.
2002 Hyundai Accent - Totaled and Gone Forever.

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Offline EightySix200SX

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Re: Wheel Offset
« Reply #9 on: 10:10:54 AM / 01-Oct-10 »
Lol just wait you'll see
« Last Edit: 10:12:50 AM / 01-Oct-10 by EightySix200SX »
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Offline sam31183

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Re: Wheel Offset
« Reply #10 on: 01:06:26 PM / 01-Oct-10 »
i need to test fit all 4 of those steelies/slicks on the car....lol.

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Offline Arro

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Re: Wheel Offset
« Reply #11 on: 11:44:06 PM / 01-Oct-10 »
Keep the discussion on the specifics of offset, any examples should be seperate threads.
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline iceageg

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Re: Wheel Offset
« Reply #12 on: 02:51:58 PM / 12-Aug-11 »
As I troll through the archive of knowledge that is burried in these forums I noticed that there are a couple things worth mentioning here.

First, using wheels with an offset improper for your vehicle can greatly impact the life of your wheel bearings.  This is usually more of an issue in heavier cars and trucks, but still worth noting.  As light as S12s are they likely allow for quite a bit more wiggle room to deviate from this general rule.  The closer you can stay to the original configuration the less contribution your wheels will have on the bearing life.

Second, you noted above that FWD vehicles usually have a positive offset and many RWD use zero or negative offset.  Some of the more exotic AWD cars like Lamborghinis have used positive offset on the fronts and negatives on the rear of the same vehicle.
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Offline silverton

Re: Wheel Offset
« Reply #13 on: 04:12:38 PM / 12-Aug-11 »
Nissan just seems to like using positive offset wheels.  s12, z31, z32, wd21, etc etc.
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Offline nismo_200sx

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Re: Wheel Offset
« Reply #14 on: 09:10:24 PM / 12-Aug-11 »
i want true 16x8 all the way around but i want a flush fit. no sunken in look and not too much plus offset. also no rubbing whatsoever. can you guys help?
i put 16x8 +12 cause if i have +0 it will hit the struts and stuff when im lowered wont it? i dont mind staggered but i just would prefer the same all the way around you know in case i flip them around when i put different tires on etc since i will be drifting.
i used the original comparison link arro had put up. i wouldnt mind a mild stretch so could i run 205's or run 195's on 8 inch wide? also would +12 offset have some sort of lip? i like lips.
« Last Edit: 09:16:58 PM / 12-Aug-11 by nismo_200sx »
1987 Nissan 200sx

Offline silvia love

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Re: Wheel Offset
« Reply #15 on: 09:21:10 PM / 12-Aug-11 »
an 8'' wide rim with a zero offset and 205/55r16's will rub like a mofo on our rears

8'' wide rim with +15 offset up front fits good with a little neg camber, stock camber rubs on 205/55, which should roughly fit the same as a 7'' wide rim with a zero offset and same height tires

rim width is as important as offset when going for a flush fitment. a 15*7 et 0 and a 15*8 et0 will fit differently, it would be like having a 15*7 et -15 or so to match the extra inch in width.... just had to throw that out there in case some are still confused
« Last Edit: 09:22:11 PM / 12-Aug-11 by silvia love »

Offline Arro

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Re: Wheel Offset
« Reply #16 on: 01:38:58 AM / 13-Aug-11 »
I have 7" wide and zero offset with 195's and they don't clear without some negative camber... I have 205's on the same wheels in the rear, and when I tried those 205's in the front, there was no way the would clear the fenders even when I maxxed out my top camber plates negative.

basically an 8" wide rim with +15 is not going to fit with a 205 tire on the front. 195 with 2 degrees neg. or more, maybe.

But he wants more of a flush fit, not something that pokes until you tuck it in with camber. Chances are, he doesn't have camber plates at the top. So the reality is, he shouldn't be running an 8" wheel in the front at all, because there just aren't many 16x8 or even 15x8 wheel choices in an offset that would be the right fit that he wants... to run 8" and flush in the front, he needs something closer to our factory offset. Keep in mind or factory wheels are 6" wide, so add another inch outward with the same offset (to get an 8" wide wheel) and you have flushness.. only, it won't clear the strut tube.

What I'm getting at is an 8" wheel that's close to flush is just not a realistic option, 7" is a better bet for the front. This is also why IMO, if you are worried about traction, go staggered with 8" all around.

The exception to this would be super-stretched tires, massive negative camber, and probably some major fender pulling.
-Jason Arro


'85 Nissan 200SX (KA24DE)
formerly,
'85 Nissan Silvia RS-X - FJ20 w/ dual Weber carbs
'84 Nissan 200SX Turbo
'85 Nissan 200SX Turbo
Drive it like you stole it, and work on it like you married it - self quote
Quote from: ka-t.org
Hella flush and all associates should be gunned down for brainwashing people into thinking a 225 and lots of camber is proper wheel fitment. THAT IS EASY, anyone can camber a skinny as tire till it dosnt rub. Now fitting an 11 with a 315 on stock fender with reasonable camber, that is fitment. And looks, and performs better than both.
i dont own a s12 at the moment but trying to acquire one to get rid of my s13 hatch
Quote from: SHOUTBOX
[27:54] zastaba: I had a friend touch the contacts on his distributer once
[28:04] zastaba: He did the super jumping up and down pain dance

Offline Athens

Re: Wheel Offset
« Reply #17 on: 04:18:01 AM / 13-Aug-11 »
Cut the fender and run ZG Flares off a 240Z. You'd probably be able to fit an 8" in the front with that, granted you have the optimal offset and tire size.
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Offline Deezus

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Re: Wheel Offset
« Reply #18 on: 06:16:03 AM / 13-Aug-11 »
First, using wheels with an offset improper for your vehicle can greatly impact the life of your wheel bearings.

everything we do to cars is bad for them.


Deez why the flip are you so smart sometimes.

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Offline nismo_200sx

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Re: Wheel Offset
« Reply #19 on: 06:20:27 PM / 13-Aug-11 »
I have 7" wide and zero offset with 195's and they don't clear without some negative camber... I have 205's on the same wheels in the rear, and when I tried those 205's in the front, there was no way the would clear the fenders even when I maxxed out my top camber plates negative.

basically an 8" wide rim with +15 is not going to fit with a 205 tire on the front. 195 with 2 degrees neg. or more, maybe.

But he wants more of a flush fit, not something that pokes until you tuck it in with camber. Chances are, he doesn't have camber plates at the top. So the reality is, he shouldn't be running an 8" wheel in the front at all, because there just aren't many 16x8 or even 15x8 wheel choices in an offset that would be the right fit that he wants... to run 8" and flush in the front, he needs something closer to our factory offset. Keep in mind or factory wheels are 6" wide, so add another inch outward with the same offset (to get an 8" wide wheel) and you have flushness.. only, it won't clear the strut tube.

What I'm getting at is an 8" wheel that's close to flush is just not a realistic option, 7" is a better bet for the front. This is also why IMO, if you are worried about traction, go staggered with 8" all around.

The exception to this would be super-stretched tires, massive negative camber, and probably some major fender pulling.
so a 16x7 +12 195 in the front work out good? no rubbing strut tubes, fenders, etc, and 16x8 +12 in the rear with 205 work the same way? complete fitment no rubbing dope looking.
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