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Old 10-08-2017, 12:58 PM
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17's or 18's

New to the Jeep world so if this has been asked before please forgive me. I recently bought a 2017 JKU sport with a manual transmission as a DD and toy for my son and I.

I am looking for pictures of 33" tires on both 17" and 18" wheels. I am worried with 18" wheels the 33" tires will look dumb but I prefer the look of 35's on 18" wheels. I work for Goodyear so I will probably go with Duratracs no matter what size wheel I decide on.

As funds allow a 2.5" lift will be added along with other accessories so I can teach my son to work on cars (the purpose of the vehicle purchase). I could wait a while and do the 35's first and not worry about the 33's but the stock steel wheels are killing me and I don't have the funds to do everything needed to run 35's the right way.

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Old 10-10-2017, 03:11 PM   #2
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Your going to end up purchasing two sets of tires if you go that route. Get the 35's and wheel spacers for your oem wheels. What is your current gear ratio? 3.21 or 3.73? If you have 3.73, you can do 35's, if you have 3.21 ... I don't even recommend running 32" tires as you will not see 6th gear very often. I ran both combinations. 3.21 on 285/70/17 on my previous 2012 4dr 6spd, 3.73 on my current setup and switched to 4.56.

Be weary that upsizing your tires will require a bit more money than just tires alone. A tire carrier is recommended as well as a regear.

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Old 10-10-2017, 03:20 PM   #3
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Also, I vote for 17's as tires are much cheaper (then again you work for goodyear), but most of all ... weight.
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Old 10-10-2017, 03:26 PM   #4
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My vote is 17s if you plan on going off road.

Here's our '16 with 2.5" lift and a 315/70/17 Duratrac
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Old 10-10-2017, 03:53 PM   #5
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x2 on the 17" with 35's. I have 315/70/17 PC extreme MT2s with 3.73 gears and it works for me. Not gonna win any races, but Ii's manageable.
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Old 10-11-2017, 08:02 PM
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Thanks guys. dawhiteJKU, unfortunately my Jeep is geared 3.21 so a gear change to at least 4.10's is in the plans. I was hoping to swap the stock 16" tires to my wife's DD and then change the stock wheels and run either 32" or 33" tires while I save up for the lift 2.5", regear, tire carrier, etc. I can afford wheels and tires now but not everything and I think the 33's will work for a while after I get the lift installed next year.

Just curious after doing the math, at freeway speeds with 32" tires I would only be turning 180-200 rpms less than I am now with the stock 225/75R16's. Do you think the reduced power is caused by the lower rpms or more a function of the increased unsprung weight due to the larger wheels and duratracs.
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Old 10-11-2017, 08:10 PM   #7
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@Joverman wheels/lift/tires usually go hand in hand. Many build by steps...myself included but the wheels/lift/tires are the most expensive lol.

Since you did the math and at freeway speeds, your going to be turning about 200 less, however from the whole powerband, it will take more time to get it up to highway speed. There’s a lot of variables and each jeep/driver/location is different.

Unsprung weight/larger tires will play a significant factor.
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Old 10-11-2017, 08:12 PM
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Nibbleonarichard and Blue baby sound why do you prefer the 17's over 18's besides money? Increased sidewall height or another factor? I have 295/70R17's on my Duramax and like the size and ride quality. I definitely don't want tires taller than 35's and 18" wheels are the tallest I could ever see using on a 4x4.
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Old 10-11-2017, 08:33 PM
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Yeah I getunderstand the whole power band issue and it is a very viable reason. In a past career I was an engineer/engine builder/machinist for a NASCAR team so I am mechanically inclined. But this is my first Jeep so I am still learning the platform and all of the little quirks.

My other vehicle is a Duramax making 500-550 hp so I was not expecting to be as impressed with the 3.6 and a manual transmission as I was . With that said I will probably try to add some sort of power adder after the gear change.

Thanks for the help.
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Old 10-12-2017, 07:55 AM   #10
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Quote:
Originally Posted by Joverman View Post
Nibbleonarichard and Blue baby sound why do you prefer the 17's over 18's besides money? Increased sidewall height or another factor? I have 295/70R17's on my Duramax and like the size and ride quality. I definitely don't want tires taller than 35's and 18" wheels are the tallest I could ever see using on a 4x4.
For me it's the sidewall. For a 35" (or less) no larger and no smaller than 17". Once you get up to 38"+ tires a move up to a larger rim is OK.

IMO

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