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Discussion Starter #1
I want to go to the 35" bfg km2. I am looking for a wheel to fit. BFG calls for a rim width of at least 8.5" for a 17" wheel or 8" for 16" wheels. I'm trying to locate the correct backspacing to run a 35x12.5 tire. I found the ALLPRO thread with their 3.75", will 4" work? If you are running on 35s what backspace do you have? Looks like some of you are using spacers. Whats the wheel backspacing and spacer thickness used? I would like to make the right choice and I'm sure with all the experience on the forum I can.
 

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what would the offset need to be ?
 

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I'm not running 35's, but I am running 33x12.5's. I had to spend a lot of time getting the backspacing correct so that I didn't blow out my bearings, or put to much pressure on the axle. A lot of this is overlooked by most when selecting tires/wheels, and you could end up paying a lot out of pocket 30 or 40K miles down the road. At the same time I had to make sure I cleared the calipers and all the other goodies when I had the wheel at full pivot. Not to mention that if the tire is sticking too far out of the wheel-well, you're going to spray the side of your truck with mud and/or rocks.

I do have the 1 and 1/2 inch Bushwackers on but the wheels barely stuck out past the stock fender flares. Mainly I got these to protect the body from debris. If the tires are sticking out too far past the fender flares, that's when you could start running into trouble with strain on the axle.



For my size tire I picked up the Moto Metal MO957 17x9 in black chrome. The ideal backspacing was 4.53" with a -12mm offset. One of the other things I needed to clear was near the body mounts. I didn't want to have to chop the whole mount. I see a lot guys doing that, but I don't think it's a good idea. By leaving more of the mount on, it will add more stability and strength to the vehicle. I cut enough off to fit 35's when the time comes. It took a lot of calculating to figure all of this out.

Hope that helps you.

 

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Discussion Starter #6
I believe backspacing and offset are both ways to measure the same thing. Offset from centerline to mount and backspace from rims lip to mount.

Quoted from 4crawler dot com

"Note that offset and backspacing are related but measured at slightly different points.

* For example, I have a set of 15x8 alloy rims, with a -19mm (3/4") offset and the backspacing measures 3.75". So using the centerline at 4", subtracting 3/4" from that gives 3.25" for the rim mounting surface, which is measured off the inside face of the inside bead. So where doe the extra 1/2" come from (3.75" - 3.25")? Its from the thickness of the lip of the rim, in fact a tape measure shows the distance from the inside face of the bead to the outside of the rim lip to be 1/2".

Backspacing and offset are two different measurements of essentially the same thing, however they are opposite in sign

So more backspacing means the wheel sits in closer to the axle and that less of the wheel's width will appear outside of the wheel moutning flange, giving a narrower track."
 

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Discussion Starter #7
:bump::bump:

The body mounts are chopped, regeared to 456. I am going for BFG KM2s in a 35" format I just need to decided on wheels. So let me rephrase the question. If you have 35" tires, what wheels or wheel/spacer did you use to make it work? Are you happy with your choice or would you do something else? Help me in making the right choice the first time.
 

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Rim 20X10 with 4.75" backspacing using 1:25 Hub centric spacers tire 325X 60X20 35"s
 

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:bump::bump:

The body mounts are chopped, regeared to 456. I am going for BFG KM2s in a 35" format I just need to decided on wheels. So let me rephrase the question. If you have 35" tires, what wheels or wheel/spacer did you use to make it work? Are you happy with your choice or would you do something else? Help me in making the right choice the first time.
Stock wheel spacing, no spacers, 16 X 7.5 with 4 5/8" back spacing, couldn't be happier...
 

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Discussion Starter #12
I got the 16" pro comp rock crawler (87-6883t) 16x8-3 3/4 backset mounted with BFG KM2 315/75R16. The truck has a 3" OME lift and a Demello bumper. I put 2" spacers under the rear bump stops. I have the slightest rub at extreme flex inside rear wheel wells. I am verry pleased with the out come. Will post pictures tomorrow.
 

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I got the 16" pro comp rock crawler (87-6883t) 16x8-3 3/4 backset mounted with BFG KM2 315/75R16. The truck has a 3" OME lift and a Demello bumper. I put 2" spacers under the rear bump stops. I have the slightest rub at extreme flex inside rear wheel wells. I am verry pleased with the out come. Will post pictures tomorrow.

sweeeeet. Thats exactly my setup. Nice. Now I just need the wheels and tires. Ive got the demello as well with a winch. That setup is damn heavy though. Im starting to think that the 885's are too light, and might move up to the 886. By 3" OME, is that what you meant? Any spacers up front?


Love the set up man. Time to buy me some new wheels and tires.

Thanks :rocker:
 

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Do you think 4" would clear the UCA's? In other words, do you have more than a 1/4" between your inner tire and the UCA's?

I want to get wheels in the near future... with the hopes of being able to go to 35's in a year or so. Just trying to get the right wheels now. The wheeler's with the 4" backspacing seems like a good deal.
 

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Backspacing:
Also called rear spacing. Distance from extreme back edge of
rim, not bead seat, to the mounting pad. Lay a straight edge
across back edge of rim and measure down to mounting pad.

Wheel Offset
The distance from the wheels centerline to the plane at which
the wheel meets the hub. Positive offset is toward the outside
of the rim, negative offset is toward the inside. Zero offset is
the center of the rim.
 

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Backspacing:
Also called rear spacing. Distance from extreme back edge of
rim, not bead seat, to the mounting pad. Lay a straight edge
across back edge of rim and measure down to mounting pad.

Wheel Offset
The distance from the wheels centerline to the plane at which
the wheel meets the hub. Positive offset is toward the outside
of the rim, negative offset is toward the inside. Zero offset is
the center of the rim.
I'm not sure if you were directing this to me or not? Thanks for the lesson though. I kinda knew that... not that I ever get it right. I know if I have less backspacing the wheel will be pushed out further from the hub? I just wanted to make sure I get the right amount.



You can have a zero offset and still have your backspacing change everything? A zero backspacing would push the wheel out 8" from the hub if it was an 8" wheel... am I correct?

I guess I'll make my own measurements and stop being a lazy butt asking dumb questions.
 

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Discussion Starter #18
By 3" OME, is that what you meant? Any spacers up front?


Love the set up man. Time to buy me some new wheels and tires.

Thanks :rocker:
Yes the lift came from Toytec 885s with ToyTec Top plate spacers for 3".

Do you think 4" would clear the UCA's? In other words, do you have more than a 1/4" between your inner tire and the UCA's?

I want to get wheels in the near future... with the hopes of being able to go to 35's in a year or so. Just trying to get the right wheels now. The wheeler's with the 4" backspacing seems like a good deal.
There is 1" of space between UCA and tire. Spare tire fits on back just touches bumper I think the 1/4" might cause a problem there. I choose the Pro Comp wheel over the Wheeler's because Wheelers would not answer questions via email before the sale so I was concerned that if a problem came up during or after the sale we might of had communication issues. Shipping also increased over-all cost, but I really wanted "White" wheels. The local Pro Comp dealer did not charge extra for shipping and could test fit before sale.







 

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I got the 16" pro comp rock crawler (87-6883t) 16x8-3 3/4 backset mounted with BFG KM2 315/75R16. The truck has a 3" OME lift and a Demello bumper. I put 2" spacers under the rear bump stops. I have the slightest rub at extreme flex inside rear wheel wells. I am verry pleased with the out come. Will post pictures tomorrow.

Thanks 5greens. Just ordered me 5 87-6883t's. Apparently the t means toyota specific to clear the calipers. Can't wait. Thanks for the advice.
 
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