Black Rock Rims???

[lbishop]

Just ordered the iab and hd tras to beef up my steering and now its time to swap out the wheels lol

The wheels I have on it right now are limiting my tire sizes due to a 4.5 inch backspace

Im considering blackrock steelies, I've got it narrowed down to these
1:

2:

heres the specs for both rims:
wheels size: 16x8
Bolt pattern: 6-5.5
Offset (+ or - mm): 13
rear spacing: 5 in.
center bore: 4.280

The 5 inch backspace is what I want but, how is that 13 mm offset going to effect fitting a 285/75/16 tire?? My current rims have a 4.5 inch backspace w/ 0mm offset
also, is that center bore the right size?

This junk is way over my head lol, I would ask a tire shop but they told me I'd have no problems fitting my 265/75/16s stts under my truck at stock height, WRONG!!!

Black rock customs shop has the option to order a custom min,-max range on the backspacing.

Thanx for the help

 

[NismoFire]

Why keep the 16s? I'm swapping to 15s as soon as I can. Tires are MUCH cheaper.

 

[lbishop]

I would ditch the 16s but I also dont wanna have to cut metal. So I been looking around and it seems like my only options are factory nissan 15s painted black/line-xed or some 16 inch black rock w/ the 5 inch backspace.

I have no problems cuttin plastic but cuttin metal bothers me lol

 

[AbuseTheElderly]

Going down from 16's to 15's will not require cutting metal. The inch that you take off of the rims can be added to the sidewall of the tire. A 33" tire is a 33" tire whether on a 16" or 15" rim. It is the backspacing that causes you to have to cut metal.

 

[lbishop]

Right but the best backspace I can find in 15 inch aftermarket rims is 4.75 which requires folding metal back or cutting.

My 1st xterra had 15 inch rims so that is an option for me too. Im just kinda of leaning towards the black rocks at the moment, may change mind lol

How does that 13 mm offset affect the rims fitment??

My current rims have a 4.5 inch backspace w/ 0 offset.

 

[AbuseTheElderly]

Ah, I was not aware of the BS issue with the rims you were looking at.

Backspacing and offset are measurements of the same aspect of the wheel. Offset is the distance (in mm, + or -) the mounting point of the rim is from the center line of the rim as a whole. Ex: a 15X8 rim with an offset of 0 mm would be a rim with 4" of backspacing. The same rim with 5.5" Backspacing would have an offset of +38.1mm. (Inches X 25.4 = mm)

 

[lbishop]

Umm yeah,

@abuse the elderly, man I think I understand what your driving at lol, but just so i'm in the clear will i be able to fit that 285/75/16 w/ 5 inch backspaced black rocks without cutting metal or folding the metal back??? The setup I wanna go to is black rocks wrapped in nitto trail grapplers

* I've got a t-bar crank up front and 2 inch body lift already. Plus the trimming i've done with with my current setup also

 

[lbishop]

done a little looking around on clubx about the backspacing and offset and come up this
http://www.clubxterra.org/forums/showthread.php?t=33986

specifically post 3

*Its a second gen w/ 17 inch tires but its the same deal.

Im still kinda of worried about that 13mm offset.

Even the cragar soft 8s have that 13 mm offset.

SInce its a positive 13 mm offset, does that mean its going to tuck into the fender more than a rim with a 0 mm offset, or the opposite

Thanx for yalls help and patience

 

[TJTJ]

Ah, I was not aware of the BS issue with the rims you were looking at.

Backspacing and offset are measurements of the same aspect of the wheel. Offset is the distance (in mm, + or -) the mounting point of the rim is from the center line of the rim as a whole. Ex: a 15X8 rim with an offset of 0 mm would be a rim with 4" of backspacing. The same rim with 5.5" Backspacing would have an offset of +38.1mm. (Inches X 25.4 = mm)

This is wrong by the way.

Backspacing is measured based on the distance from the outside of the flange to the hub face (The depth of the brake side bowl).

Offset is measured from the center of the rim's width.

A rim's WIDTH for labeling purposes is the distance BETWEEN the flanges (Inside to inside)...which means in practice that a 16x8 (Or 15x8, etc...) rim is actually 9" wide (1/2" flange on either side...).

So, THAT means that 0 offset for an 8" rim is 4.5" of BS....not 4". (Yeah, they do it like that because they hate you).





The difference is important when trying to use offset for tire clearance purposes.

Our stock 16x7 rims for example ARE 8" wide, and 0 offset IS at 4" of BS.

You DO use 25.4 mm = 1" to convert between inches and mm.

So, if we want 5.5" of BS, we need the DIFFERENCE between 4" and 5.5" in offset, or 1.5" of offset....which is ~38 mm.

If we want the same clearance, but on a 16x8 rim (Which is 9" wide...), we need 1" from the 4.5" BS/0 offset to reach the 5.5" of BS, or ~ 25 mm of offset.



If you move the hub face to the curb side of a rim = you increase the depth of the brake side bowl...which increases BS, and that's + offset when its to the curb side of the zero offset point.

If you make the brake side bowl less deep, by moving the hub face to the brake side, that's - offset, etc.


Less BS means the rims stick OUT more, and when turning, the tire swings through a wider arc, hitting more stuff.

More BS means the rim has a deeper bowl, and tucks the brakes further inside it, etc...so the rims sticks out LESS, and the tires swing through a smaller arc, and hit less stuff, etc.

The More STUFF THE TIRE HITS, the more trimming you do to get that STUFF OUT OF THE WAY.



Hope that helps!

 

[AbuseTheElderly]

Ah, I did the research on the subject to help him out, I just didn't know that the flanges were not included in the width of the rim. My apologies for the misinformation, but thank you TJ for clearing that up. As always your posts are very informative.

 

[lbishop]

@tj, If I understand that correctly Im good to go w/ the black rocks and nitto trail grapplers in 285/75/16

@abuse the elderly, no worries its all good

Thanx for yalls help

 

[Jmac289gt]

I just got more confused after reading this.

But all I know is 15" tires are not only a little cheaper but more common in different sizes than a 16", at least at one time it was like that. I think as for offroading it is better with a 15" tire of the same heighth as a 16" due to more sidewall rubber and better air down ability...but it might be a minor difference between the two that it is not that noticable.

 

[Jmac289gt]

Oh, I also like wheel number two in the O.P. Sorry.

 

[Alpine Spirit]

Dont worry about it....

 

[J Everett]

Dont worry about it....

That is the best post. Ever.

 

[Jmac289gt]

Love it ^^^, There ain't nothing like cutten up your truck or taking a sledge hammer to a fender. Just do it right and it is hardley noticable.

 

[Alpine Spirit]

Its true.... mines hardly noticable.

In terms of which one style... smooth lines or rough lines. Take your pick I would like the smooth rounded.

 

[lbishop]

I just assumed that I couldn't get a 15 inch black rock with a 5 inch backspace, but turns out I can get 15s with the 5 inch backspace.

The response I got from them was we can build a wheel like throught the custom shop but they think I'll have wheel fitment problems dropping from a 16 to a 15. Which surfing around here and on clubx I know that I'll have no problems with the rims.

Looks like I'm gonna pull the trigger on the black rocks and get some nitto trail grapplers in 33x12.50.

Do yall think i'll get away without having to cut metal??

@alpine spirit- I had a cherokee that somebody took one of those too lol I just don't think I could stand to do that to my x

thanx for yalls help

 

[lbishop]

too bad black rock doesn't offer these rims in anything but 17s, they offer both a 5.5 inch backspace, and the 5 in backspace im going through the custom shop to get.

http://www.blackrockwheels.com/products16-38/BlackRockType8PSeries937

 

[drbandkgb]

Any idea on pricing ?


Sent from the satellite of love..

 

[Jmac289gt]

You may have to do some plastic trimming, as for metal trimming I would doubt it, maybe hammerring a little on the rear lower corner of the front fender behind the tire and the splash guard there may need to be trimmed. But maybe not, this is mine with 32X11.50 15's but with wheels that really stick out.

 

[lbishop]

called my local black rock dealer about pricing on a the 16x8 and the custom 15x8. suppose to get back to me with the prices

Heres the ones I decided on (just waiting on the price)

 

[lbishop]

Not sure wats up, The local tire shop called back today and informed that it will be like 4 months before they can get a 16x8 rim or before an order can be put in for the 15x8 plus the 4 week wait for it to go down the line.:wut:

Idk wats up with that, the 16x8 rims isnt even a custom deal.

Anyways, I found a price for the 16x8 and there $79.99 a wheel through jegs exact backspace and everything the ship date though is 1/31/12 supposedly im gonna call and check before I order if I go 16s

Heck may just line-x my stock rims and call it done

anybody know wats up this????

 

[lbishop]

I think the big delay the trie shop informed of has to do with that style wheel. Idk anyways kinda of aggravated and the more I look around i'm considering a different wheel other than those. Wanna stay with black rocks though cause that satin black looks freaking awesome.

Wat do yall think about these

1:

*listed as not having a delay on shipping but once again gonna call and check before I order. I've ruled out dropping down to a 15 i'll just bite the bullet on tires

ALSO.....how much difference would a set of wheels with a 4 & 7/8 inch backspace and 10 mm offset make?

http://www.ultrawheel.com/pdf/rims/195 Ultra Crusher ALL Satin Black RWD.pdf

still wanna run the 285/75/16s

Do yall think that those tires could be stuffed under there without cutting metal if I swapped to the wheels mentioned above? I dont think i could fit them under there without cutting metal on my current rims (4.5 inch backspace)

thanx


* Just checking into other options

 

[lbishop]

looks like im not getting black rocks, everywhere I look the ship date just keeps getting pushed back further and further. Anybody got any other suggests I like the wheels I posted above, but have concerns about the hub bore and backspacing letting me run the 285/75/16s

 

[Jmac289gt]

So you could go to Discount Tires and get some Unique brand wheels that look like the ones in post 22 and just paint them flat black if you don't like the shiny black they come in and there normally around $50.00 each.