285's with JBA UCA's

Hi. I have JBA UCAs with Bilstein 6112s at the highest setting. Maybe just under 3". I'm wondering if a BFG KO2 in a 285/70r17 on the stock 7" TRD Pro rims will clear the JBA UCAs.

 

Welcome to the forum, i used the search function and found this.
https://www.4runners.com/threads/tr...lift-clearance-and-fitment.37065/#post-561123

 

They will clear just fine. I run them on my 08 with the same size KO2s.

 

my 2022 trail special with stock rims, 2” lift with 6112s and 285/70/17 Falkens clear my stock UCAs. Yours should clear your UCA no problem

 

TRD wheels and offset will be fine. I have to much negative offset and I get occasional rub in a curve.

 

I have Jba uca on 6112 285 70 17

 

Here's a link you can use to see how tire sizes compare, wheel offset, everything. Type in the information. Tells you how close tires are to your truck in the fender. Everything. Speedometer reading with bigger tires. Eliminates the guess work.

 

I think what made the op ask these questions is What jba says about running 17x8 on 285s.

"11.2" wide tire, if the wheel is 7.0" wide, you need a 4.00" backspace or smaller to clear the JBA ucas"

 

Good looking truck! What is the lift setting on your 6112s?
I see your mudflaps are removed. How close are those tires from rubbing the body mount?

 

Thanks! They’re pretty close, when I had stock size wildpeaks (265 70 17) on scs ray 10 wheels with a negative ten offset those rubbed on the mudflaps!

the current 285s barely clear the cab mount but if I switched to a negative offset wheel again i definitely would need a cab mount chop absolutely
The clips on the 6112s are max height and of course set to compensate for the driver side lean

 

My setup is 2023 TRD ORP with 5100s -- ended up with 2" of front lift. Rear LCA cams are cranked out to max but I only have +2.5 caster and steering feels way too light.
With 285/70 Ridge Graps on 0mm offset wheels sitting on level ground and turned to tightest spot, I have just 17mm of clearance to body mount. (Your +5mm offset wheels will give 2.5mm more body mount clearance than mine.)
I've done some math, and JBA UCAs should pull the tires 5.3mm back closer to the cab. And if they deliver the advertised +3 degrees, I'll be at +5.5 caster. So I'll lose even more clearance when 1.0 degree caster is removed to meet the JBAs spec of +4.5.
Were you able to keep your LCA cams cranked out to maintain clearance, or did the shop have to dial them back in?

 

I had to take it back twice for the alignment but they were able to get it dialed in the second time

 

That is a great alignment result. I'm really curious to know how your LCA cams are oriented.

I bought a black '24 4R last month, same as my wife's gray '23 described above. (Realized what a great truck it is over this past year and wanted to grab the last 5th gen for myself too, blah, blah.)
So now, I've got this nice set of UCAs but I've decided to put them on my '24 first, because it is already in the garage all taken apart getting the exact same lift/tire/wheel treatment as the '23. Of course, I will upgrade her UCAs later if mine aligns and drives well with no rubbing, squeaking, etc.

I assembled the driver side on my '24 last night. Held side by side with stock UCA, the JBA upper ball joint is positioned 1" closer to the firewall, consistent with JBA's +3 degree claim.

As I said before, the caster on my '23 maxed out at +2.5, but with permission, the shop slightly compromised my camber to get it that high. So technically, if my camber was in spec, caster would actually be about +2.0. The JBAs +3 caster would be stack onto that +2.0 and give me +5.0 total. With the exception of small differences in manufacturing tolerance between my two trucks, those are the results I expect on my '24.

The extra lift from your 6100s pushed your caster even lower than my setup. Maybe as low as +0.7? The additional caster was perfect to put your truck right back to the top of factory spec, and I bet your rear cams are rotated fully outboard, providing max clearance.

I'll wrap up my installation, get the truck aligned, and share the results to help anyone else who is on the fence about doing this.

 

Now that I have completely hijacked this thread (I think OP got is answer, so I guess its ok):
I got my '24 aligned yesterday. Tech was able to easily achieve JBAs numbers, but when I walked out to have a look, all 4 cams were set dead center. Fine for stock tires, but a big problem for me. I had to convince him I needed the rears dialed outboard to create cab mount clearance.
I realized I would have to exceed +4.5 caster to make the 285s fit. At first he argued that pushing the rears out would throw my camber too far negative. I said heck yes it will, that's why I want you to also pull the front cams in to fix it and give me even more rear clearance. He seemed unsure, but did as I asked.
After moving all cams and doing a few sweeps to confirm numbers, I ended up with caster of +4.9 driver and +5.0 passenger with camber and toe in spec. That little bit of tweaking resulted in approximately 10mm of forward hub movement. I am going to stop back by the shop next week and buy the guy lunch for his extra efforts.
Truck drives AWESOME. Added caster is visible when tires are turned, but I don't think it is high enough to negatively impact slip angle or cornering characteristics with such a tall sidewall.
So I got home and immediately put a 285/70/r17 from my other 4runner on it for the moment of truth. I found the exact same 17mm of cab mount clearance as I have on the '23. I do not anticipate any rubbing or cutting.
UCAs didn't make a peep on the drive.
I will most likely wait until the weather cools off a little and put a set of JBAs on my '23 too. I'll bring photos of the cams and the alignment sheet from this truck and ask for identical setup.
Hope this is helpful.