Wheel BS and Off-set for 285/75/r16 Tires

[Xjin85]

Hey Fellas,

Need your help yet again.

Just ordered some new Cooper Discoveries 285/75/r16 at a killer price
(FYI there is a coupon code for $200 off $1000 on ebay)

I am trying to find new 16x8 Rims to mount with the tires and am trying to find the best backspacing and off-set.

I was hoping maybe some of you can post some pictures of your tire/wheel set-ups and include the backspacing and off-set you have.

I am trying to find a good deal on some wheels and came across Pro-Comp (#1069-6865) and they have 4 inch BS with -11 offset. Not sure how these would look but it be a great help if you guys can share with me what you have along with some photos.

I was also wondering if anybody painted the wheel wells after you cur and trim the fenders for a cleaner look and if you did how did you do it?

Finally have everything for my build! Took almost a month to get the 02 sensor for the upstream bc I had to specially order it.

Trying to just do this thing right and make you guys proud:eeks1:

-Fletch

 

[RCP Phx]

4"backspace would be about perfect.

 

[maxbraketorque]

10.5" wide with 3.75" clears everything by a mile, so I was planning on going with 4.5" BS with my 32x11.5x15 tires.

 

[DaJudge]

10.5" wide with 3.75" clears everything by a mile, so I was planning on going with 4.5" BS with my 32x11.5x15 tires.

I ran 4.5" backspace with a 4.5" lift with 33x12.5 15 BFGs which are smallish tires and it rubbed on the lower control arms.

I have 305x70 16 Cooper STT Pros now with 4" of backspace and no rubbing.

 

[XJEEPER]

I've run 285 and 295 tires on 16x8 wheels with 4" BS on my last two XJ's, 20 years of success with this combo. I'm currently running a TnT Y-Link front suspension


285/75/16 with 4" total BS and stock flares -5.5" lift

285/75/16 with 4" total BS and Bushwacker Flat Flares

295/75/16 with 4" total BS with 5.5" lift

 

[RCP Phx]

Which Discover did you actually buy? It can be a minor difference in the rim selection.

 

[maxbraketorque]

I ran 4.5" backspace with a 4.5" lift with 33x12.5 15 BFGs which are smallish tires and it rubbed on the lower control arms.

I have 305x70 16 Cooper STT Pros now with 4" of backspace and no rubbing.

Yeah, control arm choice and tire width are going to be the main factors in the max possible backspace. A 305 is ~3/4" wider than a 285, so dividing that by 2 is ~0.4". Would seem to suggest that a 285 with 4.5" BS should work or just barely rub. For sure 285 on 4.25" BS will clear if a 305 on 4" BS clears.

I'm not suggesting that 4" BS is a bad idea. Rather I'm just giving the OP a fuller idea of the range of BS that is likely to be possible.

 

[Evan03]

3.5back spacing rubs rubs control arms on 15x8 with 33x12.5s not sure how a 4.5" wouldnt even with narrower 285 tire or even possibly a 10.5" wide tire.
Though i guess it doesnt really hurt to use control arms as steering bump stops.

Mine do rub and im okay with that. 15x8 3.5bs 35x12.5 also with 33x12.5


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[Evan03]

..

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[Xjin85]

I've run 285 and 295 tires on 16x8 wheels with 4" BS on my last two XJ's, 20 years of success with this combo. I'm currently running a TnT Y-Link front suspension


285/75/16 with 4" total BS and stock flares


285/75/16 with 4" total BS and Bushwacker Flat Flares

Thank you Sir! That is a sexy jeep. How much lift do you have with the 285's? That was exactly what I was looking for as it looks like we have the same idea in regards to the 285's and BW's. Same color Jeep too.

I lifted the jeep 3" and not sure if I cam going to lift it another inch. I'm going to wait until I mouth the tires to determine.

Doing the breaks, rotors, ball joints, u-joints, bearing seals, wheel bearing hubs within the next week or so all in one shot before I mount the new tires. Will take pictures and do a writeup once everything is done.

I have actually made great process within the last 2 years with the jeep and really need to make a build thread for the forum so I can give back what I have learned here. I've practically have rebuilt the whole jeep.

Do you guys think I will be OK with 285/16 tires on 3inch lift without having to trim?
I need to get the tires on do the breaks and get the tires on ASAP but dont' want to cut and trim until I get the BW flares.

Thanks Guys!

-Fletch

 

[XJEEPER]

Thank you Sir! That is a sexy jeep. How much lift do you have with the 285's? That was exactly what I was looking for as it looks like we have the same idea in regards to the 285's and BW's. Same color Jeep too.

I lifted the jeep 3" and not sure if I cam going to lift it another inch. I'm going to wait until I mouth the tires to determine.

Doing the breaks, rotors, ball joints, u-joints, bearing seals, wheel bearing hubs within the next week or so all in one shot before I mount the new tires. Will take pictures and do a writeup once everything is done.

I have actually made great process within the last 2 years with the jeep and really need to make a build thread for the forum so I can give back what I have learned here. I've practically have rebuilt the whole jeep.

Do you guys think I will be OK with 285/16 tires on 3inch lift without having to trim?
I need to get the tires on do the breaks and get the tires on ASAP but dont' want to cut and trim until I get the BW flares.

Thanks Guys!

-Fletch

Thanks Fletch. My rig is sitting at just over 5.5" of lift. Depending on the tire mfgr., a 285/75/16 is going to measure out in the 32.5" tall and 11"-ish wide range, so trying to run these on a 3" lift with no trim is going to be a stretch.

 

[DaJudge]

I am running 305/70 16 STT Pro with 4" backspace and 4.5" lift. Had them for a few years now.

 

[Xjin85]

Thanks Fletch. My rig is sitting at just over 5.5" of lift. Depending on the tire mfgr., a 285/75/16 is going to measure out in the 32.5" tall and 11"-ish wide range, so trying to run these on a 3" lift with no trim is going to be a stretch.

Well, I have a hell of a job a head of me. I’m going to start tomorrow and do the entire break system with all new components, axel u joints, ball joints, and also slap on these control drop brackets.

While I have everything off going to remove some rust and lint the difs

Question: the 285 tires I have are 11.5 inches wide but was thinking I’d like them to pop out a bit more. What size wheel spacers you’d recommend? I don’t want it to be too much piping out but want it to be a bit more aggressive looking

 

[RCP Phx]

Get all your brake and axle work done, mount the tires and see where your at!

 

[Xjin85]

Get all your brake and axle work done, mount the tires and see where your at!

I finally finished rebuilding the entire front end and steering! I’ll post some pics later this afternoon.

I made a typo with my original post. The rims I actually bought are Soft 8’s with +0 offset with 4.5 backspacing.

I’m getting them mounted, balanced, and aligned tomorrow or Thurday. So before I get the alignment I’m trying to figure out if I need wheel spacers to get the tires to poke out past the flat flares. I’d rather not pay for the alignment to find that I need to put on spacers and then pay for it to be aligned again.

Although my tires are 11.50 I’d like them to appear more so like 12.50 for the looks. I understand backpacking and all but can’t seem to find any specific info or pic of XJ’s with regards to the soft 8’s w.4.5 BS + wheel spacers for refrence.

I really need to get these tires on ASAP because the ones I have on there now are completely bald.

Tonight I’m going to put on K suspensions rear shackle relocation brackets that’s going to raise the rear roughy 1”-1.5”

I already lifted the Jeep 3”inches with front coils and leaf springs and last week installed ACOS adjustable spacers in the front.

So as it sits now the front is a bit higher then the rear with the ACOS spacers on its lowest setting which is I guess 1.5 inches.

So it’s 4.5” in the front and after I put in the SBR’s it should be 4.5 on both sides.

 

[Xjin85]

Can anyone give me some advice with regard to 11.50 wide tires with spacers?

I’d like to get this right off the bat so I don’t have to deal with this again. Pics would really help.

From what I’ve researched any QUALITY spacers under 2”inches should be OK (as long as they are quality and properly installed)

I just want my 285/75’s poke out past the BW Flares rather than the tires looking small and tucked underneath the flares.

So if I have these soft 8’s with 4.50 backspacing + 285/75 tires + 1.5 wheel spacer it should be on par (aesthetically) to a 33/12.50 tires?
Does anyone have pics of 11.5 wide tires +spacers?

 

[XJEEPER]

In this picture, I was running 285/75/16 tires, which are approx 11.5" wide, on a 16x8 wheel with a 1.25" billet hub centric wheel spacer, for a total BS of 4".

 

[Xjin85]

Awesome! Thank for all your help xjeeper! I see your post now lol

Question: tomorrow I’m getting the wheels mounted in getting the alignment.

It’s been so damn hot out I haven’t had the chance to install my rear shackle relocation brackets and plan on installing them after the tires are aligned. Would that be OK?

I figured since I am lifting the rear and not doing anything with the front that it would be OK to do afterwards. Any thoughts?

Thanks again guys!
-Fletch

 

[RCP Phx]

Raising the rear will effect the caster/camber, do the alignment after all mods and give it a day or two for everything to settle in place!

 

[Xjin85]

Raising the rear will effect the caster/camber, do the alignment after all mods and give it a day or two for everything to settle in place!

So what your is I have to get up at 4 am and then install them. Lol

I wish this forum had a way to directly upload pictures to post. Am I missing something or can we do this?

I’ve done a lot to my rig as of late would love to show