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Discussion Starter #1
Hey guys just wanted to make sure I'm thinking this all through right. I have a 17 JKU Sport and am about to pull the trigger on a Rock Krawler 2.5" lift and will be getting tires a couple days later. My gear ratio is 3.73 and a manual trans so I should just stick with 33" or at most 34" tires with that kind of lift right?

Also for the wheels I personally like the stock ones once they are painted black so I'll be using them still. Anyone have any experience or heard of anyone that used stock wheels with wider tires, 10"-12.5" wide? Are wheel spacers generally needed when going out that wide?

My commute to base is about 20 miles and only get up to 45 mph. I live in Florida so it'll only be on sand and a little mud when I can find it. Don't plan on going up any Fock walls or rocky terrain outside of trails with mud and water.
 

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lots of people use stock rims with 33-34's. I am currently doing that with mine and no issues. my tires are 285-75-17 ie 34x11. Yes you will want to use 1.5" spacers something like Spidertrax, synergy, etc.
 

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Personally I think a 315/70r17 or 35x12.50r17 would look much better with the 2.5 inch lift.

If you choose a lightweight tire like the Duratrac you should be fine with 3.73s.
 

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4.10's at a minimum for 33's. 4.56 or 4.88 for anything bigger.
 

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4.10's at a minimum for 33's. 4.56 or 4.88 for anything bigger.
pfft. Run 3.73 with zero issue. Only real problem is I get better gas mileage and less wear and tear on the engine than the people with 4.10's do.
 

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totally happy with 4.10's and 35's on 16 jkr with auto and was totally happy with 4.10's on my 14 jkur with 35's.
 

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Running 3.73s with 34s. No noticeable difference still has plenty of power. That said I am not running heavy bumpers or even tire wheel combo.


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I have 3.73 gears (auto trans) with 2.5 inch lift and Duratrac 315/70r17 tires. Programmed tire size with AEV.

It's not fast like my 370z sport, but I'm happy with it. I rented a stock Sahara in the Florida Keys which I'm almost certain had 3.21 gears and stock tires, and it drove very similar (just lower to ground).
 

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Before you worry about gearing, try it as is with the tire size you want, and if it feels too slow or you don't like it, gear up. If you like how it drives with 35's and 3:73 gears, then keep it. People on this forum get so worked up over HAVING to have 4:56 gears for 35's. It's an opinion. Try it, don't like it, change it.
 

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Before you worry about gearing, try it as is with the tire size you want, and if it feels too slow or you don't like it, gear up. If you like how it drives with 35's and 3:73 gears, then keep it. People on this forum get so worked up over HAVING to have 4:56 gears for 35's. It's an opinion. Try it, don't like it, change it.
It is not opinion it is fact. When you increase your tire size and don't regear you are increasing the load on the entire drive train and effectively lower your final ratio.

Someone else put this together when talking about towing, 3.73 gears and stock Rubi tires, 32 inch.

Tire size=effective ratio
32=3.73
33=3.62
34=3.51
35=3.41
36=3.32
37=3.23
 

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It is not opinion it is fact. When you increase your tire size and don't regear you are increasing the load on the entire drive train and effectively lower your final ratio.

Someone else put this together when talking about towing, 3.73 gears and stock Rubi tires, 32 inch.

Tire size=effective ratio
32=3.73
33=3.62
34=3.51
35=3.41
36=3.32
37=3.23
Yep, definitely a fact, however, the OP can certainly get by for a little while and re-gear later.

OP, 2.5 RK calls for 35's. Do it.
 

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Discussion Starter #13
Well thanks everyone for the input. After reading all of your inputs and talking to a couple fellow jeep guys here in Panama City I'll more than likely stick with 33" and just make sure their fat (12"-12.5") since all I'll ever see down here is sand. When I PCS to somewhere with mud I'll get bigger tires and regear.

Thanks again for being a great community and source of information for new people like me!
 
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