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Unread 10-07-2011, 10:48 AM   #1
tpeters1
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Goodyear MTR 285 vs 305?

I was at my local tire shop today and they were trying to talk me out of the 305 MTR's for my 04 Jeep Rubicon. I am looking at the going to a 33 inch tire. I will be running the stock rim and I am in the process of adding 3 inchs of lift (2 1/2 suspension and 1/2 body) I will be running wheel spacers with the new tires. If I understand it right

285/75R16 = 33 X 11
305/70R16 = 33 X 12

The reasons the shop gave me or not using the 305's were
1) The rim was to narrow
2) The 305 are very hard to get
3) No difference in tire once on the jeep

I have only run the stock factory O4 Mtr's so was looking for advice or input from those who are running this combination.

I have not had problems with my currant MTR's other than not great on hard packed snow or ice.

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Unread 10-07-2011, 11:16 AM   #2
eugenesonrisa
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I may be incorrect but I believe the 305 is the height and 70 is the width.
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Unread 10-07-2011, 11:17 AM   #3
Moto4x4
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Quote:
Originally Posted by eugenesonrisa View Post
I may be incorrect but I believe the 305 is the height and 70 is the width.
thats what i thought
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Unread 10-07-2011, 11:18 AM   #4
KillerSloth
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Quote:
Originally Posted by eugenesonrisa View Post
I may be incorrect but I believe the 305 is the height and 70 is the width.
You are incorrect.

305 stands for 305mm (12 inches) tread width, and the 70 stands for the sidewall being 70% of the width (so 305mm x 0.70 = 213.5mm = 8.4 inch sidewall)... 16" rim + 8.4"(2)= 32.8" tire

305s will fit on the factory Rubicon wheels, and the only issue you would have is rubbing while turning, but if you are adding wheel spacers, you will be fine.

I notice a difference in width when looking at the 2 tires, but I love my 285s. Either won't make a huge difference, and if the 285s aren't on backorder then I would just get them.
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Unread 10-07-2011, 11:20 AM   #5
goolsbayjeep
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Quote:
Originally Posted by eugenesonrisa
I may be incorrect but I believe the 305 is the height and 70 is the width.
That is what I have always been told, so they might be wrong. But I'm not 100% sure
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Unread 10-07-2011, 11:21 AM   #6
Jtrux
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You are both wrong. 305 is the width, the 70 is a percentage of the width and is the heighth of the sidewall. So take your wheel (16") plus 140% of the width and you get the heighth. Does that make any sense? I'm not good at explaining things.
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Unread 10-07-2011, 11:37 AM   #7
MAMMOTH
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305/70R16's on Moabs work great.
Not sure what the shop is trying to sell you.
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Unread 10-07-2011, 11:38 AM   #8
tpeters1
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Sorry

For the Confusion it is probably my mistake

This is what I have for tire size

305/70R16 = 33 (32.8) High and 12 wide

285/75R16 = 33 (32.8) High and 11.2 wide

This is the place I did the conversions

http://www.therangerstation.com/tech...nch_Tires.html

He also said that due to the the fact that it was an 8 inch rim that the wider tire might not look right once mounted.

Guys sorry if I am being a pain just want to get the right size tires.

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Unread 10-07-2011, 11:44 AM   #9
KillerSloth
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Most people run a 12.5" tire on an 8" rim so you will be fine with either tire.

Pick which ever one you think looks better (do you like wider tires, or skinnier tires?)...

I have had a pair of 305/70/16 tires mounted to Moabs on my Jeep, and they worked fine, and I currently have 285/75/16s on it and they are also great.

Here are some pics with a 3" lift (all suspension) with 285/75/16s:







This is with 305/70/16 and a 2" lift... not a great picture, but the best I have.
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Unread 10-07-2011, 12:04 PM   #10
tpeters1
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KillerSloth - Thanks a pick is worth 1000 words and like I said I do not want to get the wrong Tire. For me they 5 MTR's are not cheap.

I like the way on your jeep they stay under the flares are you running wheel spacers?
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Unread 10-07-2011, 12:13 PM   #11
KillerSloth
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No, I am not running spacers. I rub a little bit in the front when at full lock, mainly on my control arms, and a little on my upper spring perch. It's mainly on one side because I have the stock front trackbar and it pulls the axle to one side, making it closer. If it was centered, I bet it would barely rub, and I could just add a small washer to the steering stop to keep it from rubbing. Once I add aftermarket control arms, I don't think it'll rub the control arms anymore though.

For the rear, you will have to run an aftermarket trackbar or a the OME trackbar bracket because when I didn't have it on, my tire was about 1/8" away from the upper spring perch on the driver side with the 285s.

If you get the 305s I would definitely run spacers though. The clearance on the upper spring perches and the tires in the rear is still pretty low, so the 305s would be even closer to rubbing, although it worked for a little bit on my 2" lift.

EDIT:I just remembered you have a Rubicon, so your flares will stick out 1.5" further than mine (3" vs 4.5") so even with the wheel spacers on the 285s, you should still be under the flares. The 305s, should only stick out a little bit with the spacers.

When I go home for lunch I'll try to snap a pic of how far out the tires stick from the flare. It may be a little off, since the front is on jackstands right now (I broke my Jeep )
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Unread 10-07-2011, 12:22 PM   #12
tpeters1
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Over the winter I am adding
OME (springs, shocks, steering stabilize)
Rokmen (control arms and 1/2 body lift)
Currie (front steering, front track bar and anti rock)
JKS rear track bar
Wheel spacers
engine lift

When everything is off I am putting POR-15 on the underside so it will be a very long high beer consumption project. I can only work on it after the kids go to bed.

So with what you have told me I think I will be good either way. Why did you switch from the 12 to 11 inch tire?
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Unread 10-07-2011, 12:28 PM   #13
hustler905
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I think they just don't want to order in the harder to get tire.
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Unread 10-07-2011, 12:35 PM   #14
KillerSloth
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Yeah, you should be fine. For the rear track bar, I would get the Currie one that Savvy sells though. Hell, look into the 3" lift Savvy sells with the Antirock, it will have everything you need, except for shocks. I am running their springs and love them.

The 305s (and wheels) were actually my friends and I was selling them for him. I had them on my Jeep for a little while to decide if I wanted to buy them since I was running 32s at the time. I didn't have the clearance for them with the 2" lift though (wasn't properly bumpstopped for them) and didn't want to mess up my fenders.

The reason I went with the 285s and Moabs now, instead of a 33/12.5/15 (have aftermarket 15" wheels) is because I got the wheels and tires (about 75% tread) for $300 from a friend . Made my decision VERY easy.
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Unread 10-07-2011, 12:39 PM   #15
tpeters1
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Hustler - I think I agree with you as for not wanting to order the harder tire. It hurts me because I think I am just going to order from the tire rack and have the tires mounted when the alignment is done after everything is installed.
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