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Unread 06-23-2015, 06:36 PM   #1
kabowabo
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Question about wheel offset and tire size.

I'm about to order some new wheels for my TJ. I'm going to run 16 x 8's Black Rock Soft 8's and I was curious about what offset you guys are running. I'm also looking for a 33" tire and was thinking about the BFG KM2 in 255/85R16. Anyone have any experience with this size?

Thanks

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Unread 06-23-2015, 07:16 PM   #2
ravenworks
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Why 16 inch tires,sizes are limited no?
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Unread 06-23-2015, 07:32 PM   #3
WranglerX2006
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Quote:
Originally Posted by ravenworks View Post
Why 16 inch tires,sizes are limited no?
I'm switching to 16 inch rims because there are actually way more options. In 15 you have 31x10.5, 33x10.5 in like one brand, 33x12.5 and 35x12.5 and that's it. for the average jeeper that is, they do have some larger. Many more options for a 16 inch rim
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Unread 06-23-2015, 08:58 PM   #4
kabowabo
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In my area most floatation sizes above 31x10.50 are special order where most 16 inch sizes are in stock.
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Unread 06-23-2015, 09:58 PM   #5
GL1
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Much to consider here: http://www.jeepforum.com/forum/f9/ge...s-17s-2976985/
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Unread 06-23-2015, 10:29 PM   #6
geroux
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Quote:
Originally Posted by kabowabo View Post
.....I was curious about what offset you guys are running.....
Forget offset. That can vary depending on wheel width. Backspacing is the commonly used term that will give your tires some space. The wider the tire... the more backspacing you'll need. There are other variables to consider also.

http://www.quadratec.com/jeep_knowle...article-33.htm
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Unread 06-24-2015, 12:05 PM   #7
kabowabo
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Good info, thanks.
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Unread 06-24-2015, 12:07 PM   #8
kabowabo
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Originally Posted by geroux View Post
Forget offset. That can vary depending on wheel width. Backspacing is the commonly used term that will give your tires some space. The wider the tire... the more backspacing you'll need. There are other variables to consider also.

http://www.quadratec.com/jeep_knowle...article-33.htm
I meant backspacing, thanks for the link.
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Unread 06-24-2015, 12:38 PM   #9
geroux
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Originally Posted by geroux View Post
The wider the tire... the more backspacing you'll need.
I meant. The wider the tire... the less backspacing you'll need.

I'm glad I caught it before I was attacked.
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Unread 06-24-2015, 10:13 PM   #10
kabowabo
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Ordered my tires and wheels today. Wheels I got BlackRock soft 8s in15 x 8 with 3.75 backspacing and for tires I got 33x12.50R15 Hankook Dynapro MT RT03. The main difference between the 15s verses 16s price wise was by steping down to my second choice in tires I was able to purchase a spare wheel and tire as well for just a few more dollars. Thanks for the input and links folks.
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Unread 06-24-2015, 10:20 PM   #11
geroux
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Quote:
Originally Posted by kabowabo View Post
Ordered my tires and wheels today. Wheels I got BlackRock soft 8s in15 x 8 with 3.75 backspacing and for tires I got 33x12.50R15 Hankook Dynapro MT RT03. The main difference between the 15s verses 16s price wise was by steping down to my second choice in tires I was able to purchase a spare wheel and tire as well for just a few more dollars. Thanks for the input and links folks.

That's a good size combination. Hope you like them.
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Unread 06-24-2015, 10:41 PM   #12
joe_jeep
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Those should fit well.
also 15" tires are most often c range.
16" are often d or e range.
C range will ride much better.

im running 3.75 backspace with my new 35s.
It clears 35s real nicely.
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Unread 06-25-2015, 03:00 AM   #13
kabowabo
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Originally Posted by joe_jeep View Post
Those should fit well.
also 15" tires are most often c range.
16" are often d or e range.
C range will ride much better.

im running 3.75 backspace with my new 35s.
It clears 35s real nicely.
The 265/75R16s Nittos I'm running now are load range E and the ride's pretty harsh.
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Unread 06-25-2015, 06:00 AM   #14
joe_jeep
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Quote:
Originally Posted by kabowabo View Post
The 265/75R16s Nittos I'm running now are load range E and the ride's pretty harsh.
E load range tires are usually rated to carry between 3k and 4k lbs at 80 psi.
so at 80 psi, one tire could support the weight of your whole jeep.
Even at lower pressures they ride rough.

I had 285 70 17s on my ljr for a while. They were d range.
tire shop that mounted them, aired them up to 55 psi each.
It was undriveable! The tires were bouncing like basketballs.
I had to stop and air down to 23 psi. Even at 23, it was pretty stiff.

now im running 25psi, in c range 35s. Its very smooth.
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Unread 06-25-2015, 06:58 PM   #15
GL1
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Quote:
Originally Posted by joe_jeep View Post
E load range tires are usually rated to carry between 3k and 4k lbs at 80 psi.
so at 80 psi, one tire could support the weight of your whole jeep.
Even at lower pressures they ride rough.

I had 285 70 17s on my ljr for a while. They were d range.
tire shop that mounted them, aired them up to 55 psi each.
It was undriveable! The tires were bouncing like basketballs.
I had to stop and air down to 23 psi. Even at 23, it was pretty stiff.

now im running 25psi, in c range 35s. Its very smooth.
Agreed, I had D's and was very happy to go to C's. Aired down they are much more supple and so far no sidewall issues. I think D's and E's are overkill on a standard jeep setup. Plus, I went up to 35's and C's and lost weight over the 33 D's I had.
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