KMC Beadlock Wheels on 8.5 vs 9" and Offset fit.

[Go4Low]

I have a 2020 JLUR, that will be used easy to difficult trails. Now I am trying to decide between the KM234 and KM235 beadlocks with 39x13.5x17 tires to go with my dynatrac XD60 axle set. Some of this might be a personal taste, but trying to find out if anyone here have recommendations based on functionality.

As far as looks, I don’t mind the wheels sticking out, but I don’t want it to be over the top, 1 to 2 inches seem to be good enough for my taste.

Does the size of the wheel 8.5” vs 9” make any significant difference for the beadlock?

KMC Wheels KM234 Grenade Desert:
Size – 17 x 8.5
Backspace – 4.75in
Offset – 0mm
Hub Bore – 125.50

KMC Wheels KM235 Grenade Crawl
Size – 17 x 9
Backspace – 3.5in
Offset – -38mm
Bore – 125.50

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[ChattVol]

I have a 2020 JLUR, that will be used easy to difficult trails. Now I am trying to decide between the KM234 and KM235 beadlocks with 39x13.5x17 tires to go with my dynatrac XD60 axle set. Some of this might be a personal taste, but trying to find out if anyone here have recommendations based on functionality.

As far as looks, I don’t mind the wheels sticking out, but I don’t want it to be over the top, 1 to 2 inches seem to be good enough for my taste.

Does the size of the wheel 8.5” vs 9” make any significant difference for the beadlock?

KMC Wheels KM234 Grenade Desert:
Size – 17 x 8.5
Backspace – 4.75in
Offset – 0mm
Hub Bore – 125.50

KMC Wheels KM235 Grenade Crawl
Size – 17 x 9
Backspace – 3.5in
Offset – -38mm
Bore – 125.50

What width are the d60s? Lift height? How much shock travel? 39×13.50 tires are definitely going to need to poke more than 1-2" if you want room to flex.

 

[Go4Low]

The axle is the standard 68.5" with 5.38 gearing.

I have a 4.5" EVO overland lift kit with the adjustable shocks, 8 arms and front relocation bracket.

 

[Revolution_322]

You should be fine with 8.5’s. The 9” will give you a bit more of a relaxed tread and not as much crowning on the 13.5’s at highway psi (+\- 30psi). On 4.5 inches of lift id probs go for the 8.5 @ 4.5 “ backspace. If you rub it will be minor and nothing an inch of bump cant cure. The hub bore on those are massive make sure you get the proper lugs to center those on the hub.

 

[Go4Low]

You should be fine with 8.5’s. The 9” will give you a bit more of a relaxed tread and not as much crowning on the 13.5’s at highway psi (+\- 30psi). On 4.5 inches of lift id probs go for the 8.5 @ 4.5 “ backspace. If you rub it will be minor and nothing an inch of bump cant cure. The hub bore on those are massive make sure you get the proper lugs to center those on the hub.

Any particular reason you'd choose the 8.5 wide tire for the 4.5" lift?

 

[Go4Low]

I have seen claims that a narrower Non-beadlock rims is better to keep the tire on the rim when aired down. But is it the same theory for actual beadlock wheels or does that concept not apply for beadlocks. Anyone aware of any significant expectations when choosing to run a 13.5" tire on a 8.5" vs 9" wide rim?

 

[Revolution_322]

Any particular reason you'd choose the 8.5 wide tire for the 4.5" lift?

It will protect the rim slightly better due to a slightly bigger bulge.

 

[ChattVol]

The axle is the standard 68.5" with 5.38 gearing.

I have a 4.5" EVO overland lift kit with the adjustable shocks, 8 arms and front relocation bracket.

Running a 4.5" lift with 68.5" wide axles on 39x13.50 tires, you should definitely go with the 17x9 wheels with 3.5 backspacing. Otherwise, you're tires will rub badly flexing 17×8.5 wheels with 4.75 backspacing and your stance is going to be narrower and less stable with a 4.5" lift. The 17x9 with 3.5 backspacing is perfect for 39s or 40s. I've wheeled with folks with this setup on a 2.5" & 3.5" lift and it is sweet. 4.5" is pretty tall with 39s...have you considered a 3.5" lift? Many people run 40s on a 3.5" lift and it looks great.

Heck, my 37x12.50s even rub with 17x8.5 and 4.75 backspacing. If I ran 39s on these wheels, I'd prob rip the fenders and liners off the first time I flexed it.

 

[Go4Low]

Thanks for the details. Thats good info to go forward with.

I've been running the mopar 2" lift, KM3 37x12.5x17 with the mopar capable beadlocks. The KM3 tires seem to be smaller. The tire actually measured at 35" mounted, not really any issues with rubbing in the front. But the rear rubs on the inner liners. Judging from the 35s, my guess is that the 39x12.5x17 KM3s will measure right around 37" on the vehicle.

I probably could have considered a 3.5" if I had done more research, but I already purchased an EVO 4.5 " lift. If the KM3 39s look silly I'll look at a true 40" tire.

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