For those that dont understand backspacing and offset

[-Tucker-]

I know after reading this I should be an expert, and after it all, I feel pretty good about making my next wheel purchase, but I wanted to have someone clear it up for me and help me feel absolute sure that I can fit them. I am looking at a set of Boss 304's, chrome 18x9's (since I can't find 18x8's that fit our bolt pattern). They have a Backspace of 5 1/2 and an offset of +14mm. I am lowered 2 in the front using Beltech Spindles and 3 in the back using blocks. Will I have any issues at all? Thanks.

[98layinframe]

you should be fine, where are few guys on here that are running that wheel on the front of there trucks and dont have a problem. Now yes you most likley are going the have some minor tire rubbing issues on the inner fenders, and possibley the frame when you turn the wheel lock to lock... but thats to be expected with a wheel and tire combo that wide.

[91S10]

I know the site says 4 inch of bs on a 7 inch wide rim. Will 4 1/2 work on the front?

[-Tucker-]

thanks 98layinframe. I even had minor rubbing with my old 17" Eagle 203's with 255/40R17's on them. As of now, I figure anything is better than the stocker 15's i have on now with 235/70R15 on them... every dip in the road causes my tires to hit the top of the fenderwell because of the drop I got now...

Another thing is, the rubbing I have is against the anti-sway bar and the inner fender wall.

[82s10durango]

will 20x8.5 with a +10 or +15 offset fit on a 91 2wd

[98layinframe]

Quote: Originally Posted by 91S10

I know the site says 4 inch of bs on a 7 inch wide rim. Will 4 1/2 work on the front?

yeah sure it will.

[98layinframe]

Quote: Originally Posted by 82s10durango

will 20x8.5 with a +10 or +15 offset fit on a 91 2wd

yes they will. My wheels are 20 x 8.5 with a +15mm offset on them, they fit fine, but i ended up running a spacer on them to keep them a little farther away from the brake booster when im laid out. So i would suggest the +10mm ones for you, that way you dont need the spacer.

[82s10durango]

right on thanks alot for the help 98

[acftgrunt]

Im trying to understand all this. Can some one tell me what is a good back spacing for a 18" wheel witha 2"/ 3" Drop?

[98layinframe]

all depends on the width of the wheel itself. Normally a 10mm offset fits our trucks pretty nice depending on rim width again.

[sprocketxtreme]

okay, i think i have got this down pretty good, but i want to check this one last time before i get my rims. i have a 99 xtreme, with static 2/3 drop. im looking at 20x8.5rims (5 x 120.65)with an offset of +14mm. now from what i gather here, i should be cool, correct? i just wanted to make sure one last time before i throw down all this cash.

[acrofobia]

You should be fine, if you have any rubbing issues you should look into getting a 1/2" spacer.

[2Xtreme]

I've been trying to read up on thilink a lil, but I need to ask if im getting 18x8.5 rims with 0mm offset and 4.75 backspace fit my 03 xtreme good.

thanks

[98layinframe]

yes

[awdgsx92]

20x8.5 with +14mm will fit correct??

[98layinframe]

yes they will

0 offest has 4.75" backspace

+14mm offset has about 5 1/4" backspacing

both will work fine, just the +14mm wheels may rub a little at full lock on the sway bar or the frame.

[4.3Xtreme]

alright i have an 01 x cab xtreme im planning on a 2/3 drop on top of the Xtreme drop and i want to get the boss 304 18x9's i would like to try to keep the rim tire combo about the same as stock so i dont have to reset my spedo but i would like as little rub as possible so what size tire would you recommend?

[dime_blazer]

trying to figure out if this will clear inside fender.

20 x 9
10mm offset
5.39" Bs
I calculate ~4.6" from hub to outer lip

how much clearance is needed

245/35/20

[98layinframe]

Quote: Originally Posted by x faktr

alright i have an 01 x cab xtreme im planning on a 2/3 drop on top of the Xtreme drop and i want to get the boss 304 18x9's i would like to try to keep the rim tire combo about the same as stock so i dont have to reset my spedo but i would like as little rub as possible so what size tire would you recommend?

well actually since your dropped so low you would be better going with someting close to a 265 35 18, or a 245 40 18 See you can go wiider with the 35 series tires and get the same height. You are going to want to stay around a 25" tall tire so you dont rub so bad.

Quote: Originally Posted by dime_blazer

trying to figure out if this will clear inside fender.

20 x 9
10mm offset
5.39" Bs
I calculate ~4.6" from hub to outer lip

how much clearance is needed

245/35/20

you are gona want to go with a 255 35 20, since you wheels are so wide. That backspacing about the normal for that wide of a rim, and it will fit on the trucks, but.... You ARE going to have rubbing, no way around it. The tire will rub the sway bar or frame, and possibley the inner fenders when the wheels are turned hard.

[4.3Xtreme]

thanks man but if i decide against the 2/3 drop on top of the zq8 what size tires on the boss 304 18x9 would keep me at the same height as stock?
thx
x faktr

[4.3Xtreme]

bump

[98layinframe]

no need to bump a sticky thread, it doesnt move.

but anyway, a 255 40 18 is pretty close to a stock Xtreme tire.

[4.3Xtreme]

thx man haha my bad forgot about it being sticky

[my97sdime]

ok a buddy of mine has some rims from his beemer for sale. this is all he told me, they are 18" x 8.5" and a 38 offset and the bolt pattern is 5 on 120. will these fit and tuck on my bagged 97 2wd?
thanks in advance!!!

tom

[98layinframe]

those bmw wheels will fit, but your still going to need to run a 1" spacer/adaptor inorder to achieve the correct backspacing. S10s need a offset of around 0 - +15mm of offset, so those wheels would stick into the wheel wells pretty far with out and adaptor. SO yes they would tuck very easily, but you couldnt turn very well cause they would fit the sway bar or the the frame when you tried to turn hard at all.

[adamaarsvold]

Quote: Originally Posted by 98layinframe

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.

so we need a positive offset? the first pic showed negative and i got that in my head...but then we had a pic with positive posted.

[adamaarsvold]

i found this...

http://www.rsracing.com/tech-wheel.html#wheeltrm

all the info you could want about a wheel. but it says that an 8" wide wheel with 5.4 BS should have 0 offset...the guy on page 1 said it should have 4-10...

[RKs95BlackSS]

so i went to order my rims today and said i want 17x8 212's with a 4.5 backspacing. i did so and when he was on the fone with the people he gets the wheels from he said 4.5 offset instead of saying backspacing. ....? at eagle wheels they say their 17x8 with 4.5 bs has a +2mm offset. so if he just said 4.5in offset i'm assuming it should be fine. idk.

[Eight433]

Ok, this sticky has me REALLY confused.... let me see if we can clarify this... Is it the smaller the backspacing, the more "dish" you will have on the outside of the rim, or do i have it backwards... ???

[DROPTSBLAZE]

Quote: Originally Posted by Eight433

Ok, this sticky has me REALLY confused.... let me see if we can clarify this... Is it the smaller the backspacing, the more "dish" you will have on the outside of the rim...???

yes

[98layinframe]

Quote: Originally Posted by adamaarsvold

i found this...

http://www.rsracing.com/tech-wheel.html#wheeltrm

all the info you could want about a wheel. but it says that an 8" wide wheel with 5.4 BS should have 0 offset...the guy on page 1 said it should have 4-10...

thats impossible sorry...

when you measure offset your measuring from the center of the wheel out. So a wheel with a backspacing of 5.4" would be somewhere more around an offset of 18 - 21mm. Dont feel like doing the math right now..