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Author Topic: What the hell is offset, bolt pattern, etc...  (Read 6403 times)

Offline Indecisive

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What the hell is offset, bolt pattern, etc...
« on: 03:28:33 AM / 11-Jun-04 »
[span style=\'color:red\']Posted by Magnum[/span]

Offset:


The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.

Zero Offset
The hub mounting surface is even with the centerline of the wheel.

Positive
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.

Negative
The hub mounting surface is toward the back or brake side of the wheels centerline. \"Deep dish\" wheels are typically a negative offset.

If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won\'t work correctly. We have test fitted thousands of different vehicles for proper fitment. Our extensive database allows our sales staff to offer you the perfect fit for your vehicle.

The bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. Bolt patterns can be 4, 5, 6, or 8 lug holes. A bolt circle of 4x100 would indicate a 4 lug pattern on a circle with a diameter of 100mm.

The diagram indicates the proper measuring methods. 6 lug wheels are measured like the 4 lug wheels.



The centerbore of a wheel is the size of the machined hole on the back of the wheel that centers the wheel properly on the hub of the car. This hole is machined to exactly match the hub so the wheels are precisely positioned, minimizing the chance of a vibration. With a hubcentric wheel, the lug hardware will not be supporting the weight of the vehicle, all they really do is press the wheel against the hub of the car. Some wheels use high quality, forged centering rings that lock into place in the back of the wheel. This is an acceptable alternative.



Backspacing is the amount of space from the hub mounting surface to the rear bead of the wheel. for example a 7\" wide wheel with a +32mm offset will have 120.9mm (4.76\") of backspacing and 56.9mm (2.24\") of space from the hub to the front bead of the wheel.


So when looking for a 7\" wide wheel for your car you will nead a +32mm offset, 66.2mm center bore and a 5x114.3mm (5x4.5\") bolt pattern

this offset/backspacing/rimwidth chart is VERY helpful.  


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Offline 88 200sx se

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What the hell is offset, bolt pattern, etc...
« Reply #1 on: 02:51:22 AM / 14-Jan-09 »
OK so I saw some 18X8 but the offset was +38mm. I of course had to try it on first. The back fits but the fronts didn't. The rims were rubbing on my spring.   So I also saw that there was a 88 z31 that had used some 17's from a 350z with out any spacers, now I think to myself, would those 350z rims fit my car too?   17X7.5 at +33mm and 17X8 at +30mm.. help a noob out someone!   This fella is trying to sell some for $200   and I kinda thinking about getting it, but dont know if they'll fit my s12.  
87 S12 SE R.I.P
90 ACCORD - SOLD
88 S12 SE WITH Z33 17 WHEELS....SOLD
98 ACCORD SEDAN- LONG TRIP DRIVER (GAS SAVER) "SOLD"
02 MAXIMA - DAILY DRIVER
03 TRAILBLAZER - SO THAT IF PEOPLE TRIES TO CUT ME OFF, I WILL HIT THEM!
88 300ZXT Convertible. CA body!

Offline 200sxkitcar

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What the hell is offset, bolt pattern, etc...
« Reply #2 on: 03:47:58 AM / 14-Jan-09 »
doesn't surprise me at ALL with the fronts rubbing, stock clearances aren't all that great.

Unfortunately, I'm not well versed enough with the offset to tell you whether the 17s will fit, but I'm pretty sure they will need a spacer in the front.

Just so you are aware, 17s on an s12 tend to look rather odd.  Depends on the wheel tho, I've seen it pulled off quite nicely.  Got a pic?
« Last Edit: 03:48:43 AM / 14-Jan-09 by 200sxkitcar »
Sterling Picton
 

Offline s12god

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What the hell is offset, bolt pattern, etc...
« Reply #3 on: 04:10:15 AM / 14-Jan-09 »
I bought a set of 17's and posted a pic of them on here. It wasn't a week before I sold them. 17's + s12 = no way


Offline rage

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What the hell is offset, bolt pattern, etc...
« Reply #4 on: 04:23:30 AM / 14-Jan-09 »
you just need badass 17's, which no one here has money for

TX > CA

Offline 88 200sx se

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What the hell is offset, bolt pattern, etc...
« Reply #5 on: 11:31:45 PM / 15-Jan-09 »
OK..well thanks. I'll try to find out the clip that I had seen before. I will also try to post it up here too.

http://www.youtube.com/watch?v=BWHYpkRJNfI

See if this works!

I also believe those are 03 z33 track 17 inch rims. Now if the S12 is the same set-up as the z31, hopefully it would fit.
« Last Edit: 11:38:44 PM / 15-Jan-09 by 88 200sx se »
87 S12 SE R.I.P
90 ACCORD - SOLD
88 S12 SE WITH Z33 17 WHEELS....SOLD
98 ACCORD SEDAN- LONG TRIP DRIVER (GAS SAVER) "SOLD"
02 MAXIMA - DAILY DRIVER
03 TRAILBLAZER - SO THAT IF PEOPLE TRIES TO CUT ME OFF, I WILL HIT THEM!
88 300ZXT Convertible. CA body!

Offline 88 200sx se

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What the hell is offset, bolt pattern, etc...
« Reply #6 on: 11:46:51 PM / 15-Jan-09 »
http://custom-wheels-car-rims.phatkars.com...BLACK%20500.jpg

Now these rims are something different too. 5X114.3 and offset of +15mm. If the 350z rims don't fit then hopefully I'll go with these. 17X8.
87 S12 SE R.I.P
90 ACCORD - SOLD
88 S12 SE WITH Z33 17 WHEELS....SOLD
98 ACCORD SEDAN- LONG TRIP DRIVER (GAS SAVER) "SOLD"
02 MAXIMA - DAILY DRIVER
03 TRAILBLAZER - SO THAT IF PEOPLE TRIES TO CUT ME OFF, I WILL HIT THEM!
88 300ZXT Convertible. CA body!

Offline rage

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What the hell is offset, bolt pattern, etc...
« Reply #7 on: 12:54:41 AM / 16-Jan-09 »
they'll fit good, but kind of nasty (the design)

and im pretty sure 350z's came with 18's+
18's are definitely too big

TX > CA

Offline 88 200sx se

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What the hell is offset, bolt pattern, etc...
« Reply #8 on: 10:09:08 PM / 16-Jan-09 »
Quote from: rage
they'll fit good, but kind of nasty (the design)

and im pretty sure 350z's came with 18's+
18's are definitely too big


Yeah...18 are too big...but i'd prefer 17's just because they look better than 18's on the s12.

OK..finally! I picked up some 17's off the z33. Yes they do fit w/o spacers! Got 215/45 fronts and 225/45 on the backs! Should of went with 225 fronts and 235 backs. But one thing I did knowtice is that the wheel cap on the fronts have to come off for it to fit while the backs are fine. I tried posting up some pics but somehow couldn't. I will try again some other time again.
« Last Edit: 10:50:03 PM / 09-May-09 by 88 200sx se »
87 S12 SE R.I.P
90 ACCORD - SOLD
88 S12 SE WITH Z33 17 WHEELS....SOLD
98 ACCORD SEDAN- LONG TRIP DRIVER (GAS SAVER) "SOLD"
02 MAXIMA - DAILY DRIVER
03 TRAILBLAZER - SO THAT IF PEOPLE TRIES TO CUT ME OFF, I WILL HIT THEM!
88 300ZXT Convertible. CA body!

Offline Arro

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What the hell is offset, bolt pattern, etc...
« Reply #9 on: 11:08:18 PM / 25-Apr-09 »
This is a VERY comprehensive explanation of wheel sizes and choices, including the performance advantages and disadvantages. And it's written by a 510 guy

http://kmhafer.datsun510.com/wheelFAQ.htm

A must read!
-Jason Arro


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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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