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Discussion Starter · #1 ·
Rough Country 2.5" Sport Series II lift is getting installed on my 2015 JKUHR on Thursday along with 1.5" wheel spacers. Trying to decide on tires for it now.

Pretty sure I'm going with Nitto Terra Grappler G2s. It's either a 305/70r17, which is 33.86" by roughly 12.5" wide, or a 285/75r17, which is 33.86 by a little under 11.5" wide. I considered a 315/70r17, which is 34.41 and 12.7", but think that will be overkill.

Any thoughts on these sizes? I kind of like the idea of the 285. They may be a little better on gas.
 

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285 is 11.2" wide and 305 is 12.01" wide.

I like a bit meatier tire so i run a 305 but either is good. I use to have Rubi take offs which are 255 or 10" wide and I didn't really lose much mpg maybe 1 or 2 so you won't notice much at all from a 285 to a 305. A 315 is actually 12.4" wide not 12.7"

Below is a tire size calculator.

http://www.tacomaworld.com/forum/tirecalc.php?tires=315-70r17-285-75r17
 

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I like and have the Nitto 285/75/17 on my 2015 jku with a 2.5" TF coil lift. Really like the look and performance. No spacers since I have correct offset / back spacing on my procomp wheels.
 

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Discussion Starter · #5 ·
285 is 11.2" wide and 305 is 12.01" wide. I like a bit meatier tire so i run a 305 but either is good. I use to have Rubi take offs which are 255 or 10" wide and I didn't really lose much mpg maybe 1 or 2 so you won't notice much at all from a 285 to a 305. A 315 is actually 12.4" wide not 12.7" Below is a tire size calculator. http://www.tacomaworld.com/forum/tirecalc.php?tires=315-70r17-285-75r17
Thanks. My numbers are based off of Nitto's specs. 315's are said to be 12.7", 305's are 12.24, and 285's are 11.26.

These will be mounted on stock Rubi wheels. The 305's are actually less expensive than then 285.
 

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Some things to consider between the two.

305/70r17 is 62lbs
285/75r17 is 66lbs

305/70r17 requires 8"-9.5" wheel width for mounting. Stock is 7.5" width
285/75r17 requires 7.5"-9.5" wheel width for mounting.

305/70r17 - 16.5/32nds tread depth
285/75r17 - 17/32nds tread depth

The 285/75r17 will track better on the road and have less wandering. It will probably have a slightly taller height when mounted than the 305/70r17. I also like that is has more tread depth meaning the tires will last longer.

You may have issues with a shop mounting the 305s because the rim width is not within the spec of tire.

to me the only thing not in the favor of the 285/75r17 is is weighs 4lbs more.

I had 285/70r17 duratracs and moved up to 315/70r17 duratracs because I wanted something taller. You can feel the extra width in the steering and on the highway the 285s definitely tracked better. the 315s tend to find more cracks and imperfections in the road.
 

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My 2 favorite tire sizes, I just wish there were more options. I have a set of Toyo ATII's in 285/75-17 waiting for me at the tire shop. I chose the 285 since I like the overlander look a little better. Sometimes the 12.5 wides just look over done to me... But, the 305 is going to have a bigger beefier look.

These are 285/75 Toyo's on jkjeepit's ride with a TF 3" lift:

 

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Discussion Starter · #8 ·
Some things to consider between the two. 305/70r17 is 62lbs 285/75r17 is 66lbs 305/70r17 requires 8"-9.5" wheel width for mounting. Stock is 7.5" width 285/75r17 requires 7.5"-9.5" wheel width for mounting. 305/70r17 - 16.5/32nds tread depth 285/75r17 - 17/32nds tread depth The 285/75r17 will track better on the road and have less wandering. It will probably have a slightly taller height when mounted than the 305/70r17. I also like that is has more tread depth meaning the tires will last longer. You may have issues with a shop mounting the 305s because the rim width is not within the spec of tire. to me the only thing not in the favor of the 285/75r17 is is weighs 4lbs more. I had 285/70r17 duratracs and moved up to 315/70r17 duratracs because I wanted something taller. You can feel the extra width in the steering and on the highway the 285s definitely tracked better. the 315s tend to find more cracks and imperfections in the road.
Great info and some excellent points. I'm surprised the 285's are heavier considering they are the same height and an inch narrower.

I seem to lean toward the look of the 285 in all the pics I see. Just having a tough time getting past the "bigger is better" mentality for the 305, especially since it is a little cheaper.
 

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Great info and some excellent points. I'm surprised the 285's are heavier considering they are the same height and an inch narrower.

I seem to lean toward the look of the 285 in all the pics I see. Just having a tough time getting past the "bigger is better" mentality for the 305, especially since it is a little cheaper.
Well the question is what do you plan on using the tires for?
 

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The 285/75r17 will track better on the road and have less wandering. It will probably have a slightly taller height when mounted than the 305/70r17. I also like that is has more tread depth meaning the tires will last longer.
Haha yea it has .5/32nds more that's 1/64 of and inch lol... Don't know how much longer lol 😂
 

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Discussion Starter · #11 ·
Well the question is what do you plan on using the tires for?
Mainly daily driving duties - 55mph commute 40 miles round trip. If the 305s are in fact lighter, they might be a little better on fuel, but that's not really a concern.
 

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Haha yea it has .5/32nds more that's 1/64 of and inch lol... Don't know how much longer lol 😂
Hey every little bit helps and since the G2s have full depth sips its probably like extra 5000 miles depending on if the OP does a 5 tire rotation.

Note: this is based on my 285s doing a 5 tire rotation and checking the depth after 18000 miles.

Mainly daily driving duties - 55mph commute 40 miles round trip. If the 305s are in fact lighter, they might be a little better on fuel, but that's not really a concern.
I was speaking off road. Also that much difference in weight will not effect your MPG as much as the width of the tire will. For a daily driver I would 100% go with the 285s they will handle better. Depending on the weather you see. The 285s will also handle better in the rain and snow. Thinner tires will cut through water and slush better then wider tires and as I said before they track better on the road.

Another option is the Toyo AT2 extreme in 285/75r17. They are about 63lbs, but always on back order.
 

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Discussion Starter · #13 ·
Very little off-roading. This is more of a cosmetic upgrade than anything else. I'm ok with some loss in function for a little better look.
 

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Very little off-roading. This is more of a cosmetic upgrade than anything else. I'm ok with some loss in function for a little better look.
It's a tough call for us, because it's your look, not ours. I think more people prefer the fatter tire for look than the skinnier tire... Still, 285's aren't pizza cutters and they fall right in the middle of the width spectrum.

In 305, you are running the Nitto's or an MT. In 285, you do have an AT choice of Nitto and Toyo.
 

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always go bigger then you think you want.
 

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Very little off-roading. This is more of a cosmetic upgrade than anything else. I'm ok with some loss in function for a little better look.
I honestly think the 285s will look plenty wide enough with the spacers.

Your tires will stick out ~2.1" more with stock wheels 1.5" spacers and 285 tires.
The edge of the tire will be roughly at the edge of your fenders.

with the 305s stock wheels and spacers your tires will stick out ~2.5" more.
The edge of the tire will stick out past the fender about 0.4" past the fender.

Just some info, at the end of the day it depends on your needs and the look your going for.
 

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these are 285/75-17 with 1.5" spacers

 

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Hey every little bit helps and since the G2s have full depth sips its probably like extra 5000 miles depending on if the OP does a 5 tire rotation.
I know it will help it is just awkward that they would put 16.5 on one and 17 on another... Why tire manufacturers do this is beyond me... It just leaves variables between sizes... Why 1/2 a 32nd of an inch? Why not the same.
 

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This looks really good. So you are running stock 285's w/ 1.5 wheel spacers and what, a level lift? Looks great so I think I will do the same thing. Mine is a daily driver and for now I don't want to get too crazy with the lifts and tires.
 
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