Biggest tire without rubbing? stock and 2" OME lift. - Defender Source
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  #1  
Old March 25th, 2011, 02:42 PM
nopants
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Joe
1985 Defender 110
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Biggest tire without rubbing? stock and 2" OME lift.

This is on a 1985 Defender 110.

Im looking to get new tires here and wanted to get something bigger. I searched a bit and it looks like people are able to run a 285/75/16 without any issue on a 2" OME lift. Is this true? If so, what backspace and width wheels? I know that I cant run them on my stock 5.5" wheels.

What size is the max on the stock 16" 5.5 wheels? 255/85/16? Will they fit without a lift?
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  #2  
Old March 25th, 2011, 07:16 PM
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Dana Hammersley
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I use 285 75 16 on mine with a 2" lift. looks and drives fine I use the stock 7" rims. Also the 255 are a tad taller than the 285's
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  #3  
Old March 25th, 2011, 10:22 PM
nopants
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Quote:
Originally Posted by Hammertime View Post
I use 285 75 16 on mine with a 2" lift. looks and drives fine I use the stock 7" rims. Also the 255 are a tad taller than the 285's
On paper it is a .3" difference. It all depends on manufacturer in real life.

Good to know that the 285s fit with stock wheels. I was worried about backspacing. I would like to run the wider tire, but wasn't sure how it would work out. I'm guessing that there is no way to clear 285s on stock suspension?
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  #4  
Old March 25th, 2011, 11:21 PM
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John B.
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Spring lifts do not affect tire clearance.
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  #5  
Old March 26th, 2011, 11:14 AM
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  #6  
Old March 26th, 2011, 08:33 PM
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Dana Hammersley
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Quote:
Originally Posted by Red90 View Post
Spring lifts do not affect tire clearance.
Excuse me, and why do we put taller springs on then?

------ Follow up post added March 27th, 2011 12:39 AM ------

Aso with the 285's aired down you might get some rubbing on the rear spring. Ahh can't think of the word. The thing that holds your springs in place. On extreme articulation without wheel spacers. I tried just running front spacers but had rubbing in the rear.
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Old March 27th, 2011, 02:37 AM
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For more ground clearance. The srpings do not limit suspension movement. These are limited by the shocks and bump stops. Spring lift just rpovide a different ride height.
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  #8  
Old March 27th, 2011, 04:49 AM
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Tony Sims
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Springs raise the body and frame in relation to the axles, so they do create room for taller tires. Springs also improve approach, breakover and departure angles, but the axles and differentials are still at the same height, so in the main ground clearance depends on tire diameter.

Of course the taller tires may rub when stuffed in a fender when the spring is compressed.

Regardless of lift, tires significantly wider than stock can increase the turning circle by rubbing on the frame, or possibly will rub on the springs/spring perches. You can run hub spacers, or opt for a wheel with less backspacing, which then may require you to trim your bodywork.

This is why the question "what is the biggest tire I can fit" has no answer other than "what is the largest amount of money you are prepared to spend?"

This is a good tire/wheel calculator http://www.rimsntires.com/specs.jsp

The stock wheels are 5.5 wide and 33 offset. You can't get 750-16 on this calculator, but if you use 195/85-18, the key dimensions (width and diameter) are very close. Now grab your tape measure and go measure the distance from the tire to the spring perch, to the fender lip, etc. and you can play with tire sizes and wheel offsets to figure out what will fit, what might rub, and where.
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  #9  
Old March 27th, 2011, 07:34 AM
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Quote:
Originally Posted by Red90 View Post
For more ground clearance. The srpings do not limit suspension movement. These are limited by the shocks and bump stops. Spring lift just rpovide a different ride height.
I think most after market springs have a greater wire diameter. So their compressed length is longer than OEM. I could be wrong though.
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  #10  
Old March 27th, 2011, 07:57 AM
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Yes, but the bump stops should still be the limit of compression. If not, the springs are not properly designed. Collapsing the srpings completely is a bas thing to do.
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  #11  
Old March 27th, 2011, 10:21 AM
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Tony Sims
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Quote:
Originally Posted by cellulararrest View Post
I think most after market springs have a greater wire diameter. So their compressed length is longer than OEM. I could be wrong though.
Probably more accurate to say most heavier duty springs, OEM or not, use thicker wire than stock springs. But your general point is correct.

------ Follow up post added March 27th, 2011 03:25 PM ------

Quote:
Originally Posted by nopants View Post

Good to know that the 285s fit with stock wheels.

Which stock wheels? The poster is using a 7" wheel, there are 6.5 inch, 6 inch and 5.5 inch factory wheels. A 285 section tire isn't going to work on a 5.5 inch rim.
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  #12  
Old March 28th, 2011, 09:06 AM
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265's will fit no problem. The 285's will also fit but you may rub on full lock. You can adjust your stops, however. It also depends upon the back spacing of the wheels that you have. The rim width also makes a difference. You need to check the tire manufactures specifications and what rim width they measure the tire on. Most likely the manufacture measures a 255 on a narrower rim compared to a 285. On the same rim width the 285 is a taller tire than a 255. The sidewall height is a percentage of the tread width. 285 X 75% or 255 X 80%. Also to make it more confusing each manufacture makes there tire a little different. A SSR in the 285 is almost 34 inches tall. A Goodyear in the same 285 is closer to 33 inches tall.
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  #13  
Old March 28th, 2011, 02:09 PM
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A simple answer: my 285's rubbed (the front radius arm if I remember correctly) at "full lock". Barely, but they did. This can be 'solved' with spacers (which come with their own set of issues debated heartily right here on this forum) or as you noted, a different offset wheel.
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  #14  
Old March 28th, 2011, 03:16 PM
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Paul Koentges
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2nd the simple answer; I run BFG 285's on stock alloy rims, 1 1/4" steel wheel spacers; 2" lift with SG 3-link up front. AT tires rubbed more than MT's due to the square shoulder design (without spacers). With spacers, no rub and I actually adjusted the turn limiting bolts to increase turning radius over the stock AT 265's. Weekly driver and I am happy with how everything is performing...one drawback of the spacers is that the MT's stick out of the fender about 1/2" so I get caked/sprayed on the sides with mud like never before. May be my imagination, however, the wider track seems noticable (preferred), especially with how the 3-link tends to dip while cornering...I may just be lucky with how I am setup/aligned as the 90 drives/handles better than most others I have driven.

IMO: Best option is to get the correct offset steel wheel, then run 255's unless you like the wider look...I just like the look of stock.
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  #15  
Old March 28th, 2011, 03:25 PM
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Quote:
Originally Posted by PMKColorado View Post
With spacers, no rub and I actually adjusted the turn limiting bolts to increase turning radius over the stock AT 265's. Weekly driver and I am happy with how everything is performing. May be my imagination, however, the wider track seems noticable (preferred)
Great to hear. My spacers arrived on Fri or Sat and I can't wait to install them.

Quote:
Originally Posted by PMKColorado View Post
...one drawback of the spacers is that the MT's stick out of the fender about 1/2" so I get caked/sprayed on the sides with mud like never before.
I wasn't expecting THAT much protrusion, but I guess we'll see.
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  #16  
Old March 28th, 2011, 03:52 PM
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Daniel Chapman
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Quote:
Originally Posted by red90 View Post
for more ground clearance. The srpings do not limit suspension movement. These are limited by the shocks and bump stops. Spring lift just rpovide a different ride height.
lol.
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