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Backspacing and offset UPDATE!

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Old 04-30-2004, 09:47 AM   #1
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Backspacing and offset UPDATE!

Ok Since the first backspacing thread I made years ago is getting a little long and little confusing with all the edits and questions in it, I'll just start fresh here. Here goes..
First thing, the Bolt pattern on an S10 is: 5 x 4 3/4"
OR
if you measure it out in metric the pattern is: 5 x 120.65mm.
Alot of people ask if a 5 x 120mm wheel will fit.. if ya wanna be picky, no its not the correct size, but yes they do physically fit on the vehicle. **DO not hold me personally nor S10forum.com responsible if your wheel studs break from running a wheel with this 5 x 120mm pattern to them.. saw it first hand happen to a buddy of mine while driving 70mph down the highway**

Measuring a 5 lug wheel is different then 4, 6, or 8 lug wheels. For the 5 lug you measure from the far side of the one lug hole, to the center of the 3rd hole.



Now on to the offset and backspacing info. To make this as simple as possible, offset and backspace values can be interchangeable... if that makes any sense to ya, if not read on.

Offset is the distance of the mounting flange to the center of the rim. The offset of a wheel is measured with the following formula:
Offset = Backspace - (Rim Width)/2
(after you get your number it will have to be converted to millimeters)

tip..To convert from inches to mm multiply by 25.4
To convert from mm to inches divide by 25.4


Backspace is the distance from the mounting flange to the inside back edge of the rim.

If you only have the rim width to go by, you can calculate either one, given the other. The easiest way to measure backspacing is to carefully lay the wheel face down, then lay a board or something flat across the back of the rim. Last measure down to the mounting flange, this will give you your backspacing number.




Theres 3 different types of offset a wheel can have,

First is a Positive offset: This is where mounting flange is positioned toward the front side of the wheel. This style wheel will have a large backspacing and is typical to the style of rim on most FWD cars. These WILL NOT fit a 2wd s10 unless you run adapter to space the wheels out correctly.

Next is a Zero offset: This is where the mounting flange is positioned evenly with the center line of the rim. This is the style wheel a 2wd S10 requires for a stock fitment.

Lastly is the Negative offset: This style rim has the mounting flange shifted towards the back side of the rim towards the brakes. This wheel has a small backspacing and so on a 2wd S10 will push the wheels out of the wheel well further. On bagged or lowered trucks ya have to be careful as theres a good chance the wheels wont tuck up inside the fenders.


when tightening the wheels down, make sure you finger tighten the lugs enough to center the wheel on the lugs, then go around and tighten them down in a criss cross pattern this will center the wheel on the lug nuts without undue stress and or unwanted vibrations



Now finally to the part everyone really cares about. What fits! As I mentioned before since the amount of backspacing and offset required to correctly tuck inside the fenders and fit the truck changes with the size and width of the rim, you have to pay attention especially with smaller rims.



As you can see with the chart the wider the wheel the larger the amount of backspacing you need in order to maintain close to a Zero offset.


Now keep in mind you can vary outside these numbers, this is only a suggested guideline. With extreme drops, bags, and or a bodydrop these measurements can be changed to better fit if need be.


On smaller rims 14" - 17" you wont want to go much more positive offset then these numbers up front as you can run into rubbing issues on the outer tierod on the spindle steering knuckle.

7" wide - -12mm up to a +10mm offset
8" wide - -6mm up to a +10mm offset
8.5" wide - 0mm up to +6mm

On 18" and up rim sizes you can increase the positive offset a little more since the inner lip of the rim will now clear the steering knuckle of the spindle.

7" wide - -12mm up to +6mm
8" wide - -6mm up to +15mm
8.5" wide - 0mm up to +15mm
9" wide - -6mm up to +15mm


Hope this helps and isnt too confusing. If anyone has any questions feel free to post in here or pm me. Also i dont claim to know everything about wheels, so if you see something you dont agree with mention it.

Last edited by What?; 11-13-2009 at 06:20 PM.
Old 05-01-2004, 07:48 PM   #2
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re: Backspacing and offset UPDATE!

and backspacing determines offset
Old 05-09-2004, 04:04 PM   #3
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re: Backspacing and offset UPDATE!

so will 15x8s with a 4 inch bs work on a stock 2002? i'm looking at putting 235/65R15 on them.
Old 05-09-2004, 06:09 PM   #4
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re: Backspacing and offset UPDATE!

4x4 or 2wd?
Old 05-12-2004, 10:13 AM   #5
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re: Backspacing and offset UPDATE!

So how can u determine all of this information(backspacing-offest)? I bought a couple set sof wheels off of buddies and I don't know any of this info. Ths first set was off of my buddies '86 Z-28. The wheels are 15x8. I put a set of 235/60R15 BF Goodrich Radial T/A's on them. I have a slight frame rub and the inside wheel weights shear off. so i'm guessing i'm a lil snug in there. So how do figure this info OUT!?!?
Old 05-15-2004, 03:41 PM   #6
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re: Backspacing and offset UPDATE!

Measure the backspacing of them wheel, to me it sounds like it tucks too much if your getting frame rub
Old 05-16-2004, 09:35 PM   #7
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re: Backspacing and offset UPDATE!

mine is a 2wd.
Old 06-17-2004, 08:23 PM   #8
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re: Backspacing and offset UPDATE!

how is 0-4mm offset correct for our trucks if an 8" rim with 4.5"bs has 12.7mm of offset?
Old 06-18-2004, 03:18 PM   #9
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re: Backspacing and offset UPDATE!

total backspacing, including offset ... basicly to put it simple terms .. on our trucks the mounting flange should be about right in the middle of the wheel

13mm = 1/2" so..

Last edited by 98layinframe; 06-18-2004 at 03:22 PM.
Old 06-20-2004, 04:47 PM   #10
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re: Backspacing and offset UPDATE!

lol.....so? Im asking cause I dont understand. The charts on the site and you suggest that an 8" wheels should have 4.5" of bs. That means the flange is 13mm offset from center but you also said our trucks should only have 0-4mm of offset.
Old 06-20-2004, 09:44 PM   #11
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re: Backspacing and offset UPDATE!

ok so will a 19x8.5 with a 35 offset fit?
Old 06-25-2004, 09:13 PM   #12
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re: Backspacing and offset UPDATE!

why is it that some wheel co. dont even list their wheels with the bs included? I was looking at the Foose Spank 5's and you can get them (18x8) with an offset of 19mm or 34mm. So is 19mm = 4.75bs and 34= 5.34bs? and also why is it that some wheel co. list the wheels with bs and offset???
Old 07-20-2004, 12:35 PM   #13
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re: Backspacing and offset UPDATE!

SIZE AND SPECIFICATIONS: All four rims are the same size on this set.

17" x 9" (+26mm, 6.11" backspace). They are 5-lug (5 on 4.5).


are these going to fit decently or are they going to be a pain in the ass? I have no clue on wheels and spacing and such. This will be on a 4/5 drop
Old 07-20-2004, 01:51 PM   #14
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by slammed2001
SIZE AND SPECIFICATIONS: All four rims are the same size on this set.

17" x 9" (+26mm, 6.11" backspace). They are 5-lug (5 on 4.5).


are these going to fit decently or are they going to be a pain in the ass? I have no clue on wheels and spacing and such. This will be on a 4/5 drop
you will need a 1" - 1 3/8" adaptor to run those wheels, the backspaceing is wrong, but that is a good thing, cause the bolt pattern is wrong also... so the adaptor will take care of that. those wheels have a 4.5" bolt pattern, our trucks have a 5.75" pattern.

Last edited by 98layinframe; 07-20-2004 at 01:52 PM.
Old 07-23-2004, 12:49 AM   #15
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by 98layinframe
you will need a 1" - 1 3/8" adaptor to run those wheels, the backspaceing is wrong, but that is a good thing, cause the bolt pattern is wrong also... so the adaptor will take care of that. those wheels have a 4.5" bolt pattern, our trucks have a 5.75" pattern.

5 x 4.75
Old 07-23-2004, 08:33 AM   #16
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re: Backspacing and offset UPDATE!

whops... sorry.. that was a typo.. jeesh
Old 08-03-2004, 09:40 AM   #17
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re: Backspacing and offset UPDATE!

I thought I could contribute a bit here. That diagram in the first post shows a negative offset, if I'm not mistaken. You guys may have covered that in the posts that followed, but I haven't read it all.

Anyway, here's one that shows Positive offset, which (also to my understanding) is what our stock rims have.

Old 08-03-2004, 10:21 AM   #18
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re: Backspacing and offset UPDATE!

correct you are.
Old 08-03-2004, 02:13 PM   #19
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re: Backspacing and offset UPDATE!

Thought it would help everyone visualize the characteristics of the wheels.
Glad I could help.
Old 08-05-2004, 10:46 AM   #20
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re: Backspacing and offset UPDATE!

EDIT! I was looking at my original post, and now realized why it is confusing some people, the offset desired will change for the width of the rim. I posted a 0-4mm offest... I should of posted this

7" --- 0 - 4mm
8" --- 4 - 10mm
8.5" --- 5 - 15mm

now these are just approximations, the wheels you chose can vary from these measurements a little and still work.

Last edited by 98layinframe; 08-05-2004 at 10:46 AM.
Old 08-05-2004, 06:08 PM   #21
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by Tims98SS
I thought I could contribute a bit here. That diagram in the first post shows a negative offset, if I'm not mistaken. You guys may have covered that in the posts that followed, but I haven't read it all.

Anyway, here's one that shows Positive offset, which (also to my understanding) is what our stock rims have.

Guess I don't quite have it right yet.... I can only get Eagle 211's here with a 4" or 4.75" backspacing (17 x 8's) and I know the 4" BS will stick out too much because I tried some 16's @ 4" BS and they moved the tire out quite a way.... The 4.75" BS version will solve that problem but maybe go a little too far the other way by insetting the rim too much - but does the +2mm offset that they have built in, do anything toward bringing the actual rim centreline close to the 4.5" BS that I probably need to make these wheels fit my S10?
My dad also wants to get a set of these 17's for his 1968 Z/28 which only has rallys with 43/8" - 4.5 BS - are these Eagles going to come close with this type of BS and offset numbers or will the tire sit inwards too far compared to the rallys?
Why do many of the manufacturers not make 4.5" BS anymore if many vehicles, S10's included, require them and a 4" or 4.75" won't work well?

Thanks -- Kevin
Old 08-05-2004, 09:32 PM   #22
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re: Backspacing and offset UPDATE!

4.5 and 4.75...... there is only 1/4" difference. if you get the ones with the 4.75" backsacing they will fit just fine. as for your dad, have him take one of his wheels off and measure the backspaceing on his wheels, im not sure if camaros are excatly the same.
Old 09-02-2004, 03:58 PM   #23
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re: Backspacing and offset UPDATE!

It might not be exact w/ the Camaro but it will be pretty close. My dad used to swap rims w/ our old S-10 and my mom's '72 Nova. And I swapped rims w/ my S-10 and my bro's '79 Malibu.
Old 09-03-2004, 08:21 AM   #24
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re: Backspacing and offset UPDATE!

well you are correct and wrong at the same time the earlier camaros thru 92 had the same owheel ffset as our trucks, so the earlier wheels do fit on our trucks just fine. The newer gen camaros have a higher offset wheel, so no they are not going to fit correctly without an adaptor. All camaro and s10's have the same bolt pattern so the wheels will physicly fit on the truck, but they will look dumb sticking in like that, and also your turning will be shit.

Last edited by 98layinframe; 09-03-2004 at 08:23 AM.
Old 09-15-2004, 11:44 AM   #25
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re: Backspacing and offset UPDATE!

Question for you experts on offsets. Will a 20" x 8" wheel with a 5" backspace work. The website that I am ordering from says that will fit an S10 but is that too much backspacing.
Old 09-15-2004, 12:54 PM   #26
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re: Backspacing and offset UPDATE!

yes they will fit, the only thing with the 5" backspace, is that when turning you might rub pretty good on the frame and inner fenders. you would most likely want to run a 1/2" spacer with those wheels.
Old 09-18-2004, 01:05 AM   #27
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re: Backspacing and offset UPDATE!

I don't think there is enough room on the studs to allow the nut to go on with a 1/2" spacer. I have a set of 1/4" spacers so I will try them first. Wheels are on order. Thanks
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Old 09-20-2004, 08:47 AM   #28
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by thestickboy
I don't think there is enough room on the studs to allow the nut to go on with a 1/2" spacer. I have a set of 1/4" spacers so I will try them first. Wheels are on order. Thanks

no there is not enough room, there is barly enough to fit a 1/4" spacer on there safely. Im running a 1/2" spacer on my truck currently, but i also called up summitracing and ordered a complete set of longer drag racing studs, they are 1" longer then the factory studs. they were 40 bucks, so it wasnt an expensive upgrade.
Old 09-20-2004, 09:11 AM   #29
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by edthegm
mine is a 2wd.
4" will work fine-
Old 09-20-2004, 09:14 AM   #30
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by edthegm
so will 15x8s with a 4 inch bs work on a stock 2002? i'm looking at putting 235/65R15 on them.
I had 15x8 with 4" backspace on mine, it worked fine_ (96 S10)
Old 09-27-2004, 03:38 PM   #31
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Lightbulb re: Backspacing and offset UPDATE!

Here's a page that explains backspacing and offset pretty well. It's oriented to f-bodies, but the info is still relevent.
They also sell billet adapters/spacers.
http://www.skulte.com/adapterfaq.html
Old 09-27-2004, 04:15 PM   #32
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re: Backspacing and offset UPDATE!

some good info on that site...nice find
Old 10-18-2004, 12:32 PM   #33
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re: Backspacing and offset UPDATE!

Hey I want to get the Boss 304 20/22, but will the 22x9.5 fit in the rear with a +20mm offset and a 6" backspace?
Old 10-25-2004, 10:11 AM   #34
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re: Backspacing and offset UPDATE!

So what is the backspacing of the 16x8 ZQ8 and Xtreme wheels?

I'm asking because my 18x8 Centerlines have a 5" bs and they rub the frame and swaybar. I was wanting to push the stock wheels out a little bit anyway and especially in the rear because even the factory wheels seemed to be set in too much in the rear. Would my wheels rub with a 1" adapter in front and a 1.5" in the rear?

Last edited by Xtreme03; 10-25-2004 at 10:19 AM.
Old 10-25-2004, 11:01 AM   #35
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re: Backspacing and offset UPDATE!

A 1/2" spacer will work, with 18x8's the optimal b/s is 4.5"
Old 10-25-2004, 11:03 AM   #36
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by nigglewiggle60
Hey I want to get the Boss 304 20/22, but will the 22x9.5 fit in the rear with a +20mm offset and a 6" backspace?

6" backspace is too much. 5.25 - 5.5 is best
Old 10-25-2004, 10:06 PM   #37
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by acrofobia
A 1/2" spacer will work, with 18x8's the optimal b/s is 4.5"
but if I use a 1" spacer will they rub the fenders / fender flares?
Old 10-26-2004, 06:52 PM   #38
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re: Backspacing and offset UPDATE!

I think you'll have major rubbing issues on the front fenders when you turn if you use a 1" spacer/adapter. Click my banner below, my truck used to have 18x8 TT II's with a 4.5" backspacing, see if thats the look you want.
Old 10-27-2004, 09:36 PM   #39
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re: Backspacing and offset UPDATE!

will 17x8 with a 245/45/17 with a 4.25 bs work on a 2/3 drop??? what about a 3/4???

can i put a 275/40/17 work in the rear with the same rim?
how will this look?
Old 10-27-2004, 09:47 PM   #40
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re: Backspacing and offset UPDATE!

A 275/40 needs to go on at least a 9" rim. 245/45 is the widest you can go with an 8.
Old 10-27-2004, 09:53 PM   #41
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re: Backspacing and offset UPDATE!

ok...well maybe the rears aren't 8...but will the 245/45/17's work with only 4.25 bs. ??? will they fit on a 2/3 and or a 3/4 drop?
Old 10-28-2004, 08:43 AM   #42
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by Xtreme03
A 275/40 needs to go on at least a 9" rim. 245/45 is the widest you can go with an 8.
no its not...
Old 10-28-2004, 01:22 PM   #43
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re: Backspacing and offset UPDATE!

98 layin frame, will these fit w/ a 2/3 and or a 3/4 drop? i have a post in the wheel/tire/brake forum as well.
Old 10-28-2004, 08:40 PM   #44
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re: Backspacing and offset UPDATE!

Quote: Originally Posted by 98layinframe
no its not...
ok...I guess you could get something wider than that but you'd be stupid...a 245/45 should be the widest anyone should go on an 8 inch rim...check the tire manufacturers. A wider tire would push the sidewall in too much. Now if you go with a taller tire, that's a different story.
Old 10-28-2004, 11:45 PM   #45
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re: Backspacing and offset UPDATE!

a 255/50/17 will work fine on a 17x8 wheel with 4.5 bs. i was told this from norcal sti aka...tony.
Old 11-07-2004, 02:17 PM   #46
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re: Backspacing and offset UPDATE!

someone correct me if im wrong, im lookin at gettin some 20" rims, so if i need a backspace of 4.75", on a 9" wide rim i would need the mounting pad approx 1/4" out of center?leaving me about 7mm offset, am i correct in this? also im lookin at putting tires on, 245/40r20, is a 9" rim what i would want ro would i wanna go with an 8 or 8.5?
Old 11-08-2004, 08:40 AM   #47
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re: Backspacing and offset UPDATE!

if you would want to better your chances of actually turning the truck, you would be better off going wtih a 8" or even a 8.5" wide rim.
Old 11-08-2004, 02:33 PM   #48
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re: Backspacing and offset UPDATE!

and the 8" wide would still fit a 245/40r20?
Old 11-08-2004, 04:18 PM   #49
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re: Backspacing and offset UPDATE!

yes.
Old 11-08-2004, 08:17 PM   #50
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re: Backspacing and offset UPDATE!

Thanks 98layinframe
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