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Old 10-16-2015, 02:54 PM
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Talking tire questions for newbie

Hey guys,

Little bit of a background, I have a 2014 polar JK unlimited (automatic) and just looking to get some new shoes. I'll be getting a 2.5" lift and am looking at tire and wheel combo's now. It is my DD and will not see off road other than small trails/beach. My gearing is 3.21 stock. I really like the look of the Duratrac's or toyo at II and fuel wheels. Right now I'm looking at going with either (duratrac: 315/70r17, 285/70r17, or 275/70r18) or (toyo at II 285/75r17). Of course I really want the larger tires. Would i be able to put the 315/70r17 on the stock tire carrier? and with the size of the 315's, would i need to regear? I really like the look, just don't know if i could justify it by having to regear and buy a tire carrier.



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Old 10-17-2015, 07:00 PM
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Old 10-21-2015, 06:38 PM   #3
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315s won't fit on the stock tire carrier, you'll need a new one. You may also want to look into something like the Teraflex carrier brace to offload some of that weight. The brace plus adjustable carrier is pricey though, I think $700+. To run the 315s you'll also need wheel spacers or you'll rub turning. I use the Spidertraxx 1.75" spacers. Lastly about gearing... 3.21 - yikes! I've got a rubicon with 4.10s and I'd say that's probably the minimum for being acceptable. I imagine 3.21 would feel really bogged down and frustrating.
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Old 10-22-2015, 10:09 AM   #4
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If you like the BFG AT KO2 look, then you can fit the 34x10.50R17s on the stock carrier and won't need spacers either. It would probably help a little with your gearing as well, being an inch smaller diameter than the 315's. There's some threads out there with pics of that tire and size installed, take a look.
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Old 10-22-2015, 12:56 PM
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if used as a DD, with 35's, whats the optimal gearing?

i'd say about 50/50 between highway miles and city miles
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Old 10-22-2015, 01:49 PM   #6
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Quote:
Originally Posted by dienastyy View Post
if used as a DD, with 35's, whats the optimal gearing? i'd say about 50/50 between highway miles and city miles
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ID:	2573321 Answer to all of your questions. Well not all of them. When you see that table, 3.21 is really killing ya with 35's. Also, another tip. If you are getting those bigger tires, 12.5 width will decrease your MPG (not by much) in comparison to 9.5" but it is a way more aggressive tire with a usually way more upgraded sidewall. Definitely wish I knew that earlier
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Old 10-22-2015, 02:01 PM   #7
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actually many 315/70-17 will fit on the stock carrier. regearing depends. Some guys are getting by. I would not want 3.21's and 35's. I think with a 2012 and newer 4.10s or 4.56 are ideal. I have a 2014 with 4.10's and 35's and it is fine. I also have 34x10.5-17 mounted on my stock rubicon rims and they are good too. I had a 2013 jku with 3.21's and I was not happy running 33's but I live in country where you are either going up or down. Around town they were fine as were they off road. Highway driving at 70-80mph was brutal tho as was always trying to find the right gear.

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