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Old 06-18-2013, 11:16 AM   #1
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New tires question

So I just put a 2.5 lift on my jeep. I want to get some tires that are really aggressive( mud terrain probably) but I am lost. Everyone talks about 33's or 35's but all tires I have ever known come in sizes like 225/75r16( just random numbers there). So anybody want to help explain how mud tire sizing works and have any suggestions?

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Old 06-18-2013, 11:19 AM   #2
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what size wheels will you be running? we could start from there.

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Old 06-18-2013, 11:22 AM   #3
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That's another problem, I don't know. I was planning on getting new rims also so I am up for suggestions . I don't plan on doing anything really crazy. A few trails and maybe a little mud here and there. No rocks.
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Old 06-18-2013, 11:37 AM   #4
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so here are the options for you.

15' aluminum w/ 4.5 or less backspacing, 16' w/ 4.5 or less bs, or 17 w/ 4.5 or less bs. with the trails you will be running, you can pick your poison. for rocks, i'd stay with the cheapest solution possible (expect to get it a lil roughed up)

now the tires. below are the sizes that the majority of our members have. since you have a lift, any of the sizes will suit you.

15's - 35x12.5/15
15's - 33x12.5/15

16's - 285/75/16
16's - 295/75/16
16's - 305/70/16
16's - 315/75/16

17's - 285/70/17
17's - 315/70/17
17's - 33x12.5/17
17's - 35x12.5/17
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Old 06-18-2013, 11:42 AM   #5
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if your conscientious about mpg, and use your rig for dual purpose i would recommend 33's instead of 35's.

Rule of thumb....stay light!!

i did research for 6 months before pulling the trigger with my setup. with the help and knowledge from fellow members, i was able to get the perfect combination to achieve my goal...right now i'm at a healthy 19-20mpg on 285/70/17's.
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Old 06-18-2013, 11:44 AM   #6
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Tire Size Calculator - Tire & Wheel Plus Sizing

Here is a useful tire size calculator as well that helps you compare different sizes to what you currently have. If you have the stock sahara set-up (looking at your avatar) you can punch in the 255/70/18 and go from there trying out different size combinations to see the difference.
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Old 06-18-2013, 11:55 AM   #7
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Sweet, yeah I was defiantly leaning more towards 3e's just to make sure I didn't rub while driving.
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Old 06-18-2013, 12:06 PM   #8
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If you keep the stock wheels without any spacers and any of the tire sizes that i mentioned, you'll definitely rub.

If you upgrade your wheels to 4.5 or less backspacing and any of the tire sizes that i mentioned, you will not rub.
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Old 06-18-2013, 12:12 PM   #9
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Ok thanks I sm going to get new rims as well
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Old 06-18-2013, 12:21 PM   #10
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last, since you live in AK, you may want to go to the Alaska forum Alaska Jeep Forum - Jeep Wrangler Forum

and ask for the recommended tires to run your terrain, as i do not know the terrains in AK nor i do not want to give you bad advice.
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Old 06-18-2013, 12:29 PM   #11
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Just looked at some rims they are 17x8, 00 mm offset, and a 4.52 back spacing. Will that extra .02 cause 33's to rub?
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Old 06-18-2013, 12:41 PM   #12
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^no! 4.5 or less gives us the green light. i'm not saying that 4.6 will not absolutely work. you'll be ok w/ 4.52.

its the tires that you have to be concerned about. when you upgrade to wider tires, it may cause some rubbing issues... links, front airdam, fenders if disconnected, etc...

w/ wider tires and a 4.5 bs combo or less, you'll be ok. 4.52 will also be ok. anything greater than 4.5...like 4.7+ may or may not work. it all depends on the tire.
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Old 06-18-2013, 12:50 PM   #13
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The tires I am looking at are 305/65r17. I could be way off on my conversions. You think those would be ok
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Old 06-18-2013, 01:03 PM   #14
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be advised that the numbers given does not equate to the actual size when properly mounted/inflated. my 285/70/17 came up to 32 inches instead of 32.71 as advertised. also, the 305/65/17 are not actually popular in size due to price. you could go a different route to save some extra money. if your satisfied with the 305/65/17...it will fit.

305/65/17 (top) vs 285/70/17 (bottom)
Diameter inches (mm)
32.61
32.71
Width inches (mm)
12.01
11.22
Circum. inches (mm)
102.45
102.76
Sidewall Height inches (mm)

7.81
7.85
Revolutions per mile (km)
618.46
616.6
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Old 06-18-2013, 01:09 PM   #15
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Do it looks like the one I was talking about may be to wide (12 vs 11)
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Old 06-18-2013, 01:16 PM   #16
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no... the majority go 11 or 12.5.
12 will do also.
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Old 06-18-2013, 02:35 PM   #17
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Man it look like the 285 you were talking about are a lot better price than the 305, also a lot more options
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Old 06-18-2013, 02:39 PM   #18
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yessir. the sizes i have listed are the most common sizes for our jk. common sizes which are mass produced equates to cheaper prices.

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