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Old 12-28-2015, 11:09 AM
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37x12.5 vs 37x14.5

Going up to 37s on my 2 door. have already armored up and I'm ready to make the jump from 35s. I currently have 15x10 inch wheels that I love. Here are my options:

Option 1:
Keep my wheels and save money, and get TOYO 37x14.5x15s (which the tires are cheaper then option 2 as well)

Option 2:
Get the normal 37x12.5x17 TOYOs and have to pay more for the tires, as well as get new 17 inch rims. A lot of money I don't think I need to pay.

Anyone want to talk me out of the option 1? It seems solid to me.

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Old 12-28-2015, 11:13 AM   #2
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I don't have much prior knowledge or first hand experience with 37s, but I have researched a bit and read some threads here because I will be on 37s eventually. The first thing I noticed about option one is that they are 14.5 inches wide. I would want to make sure the rims have enough backspacing and I would also wonder how much extra strain and pressure they will put on the ball joints, axles, etc.

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Old 12-28-2015, 11:20 AM   #3
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I firmly believe my 37x13.5" wide Toyos, and all their weight, contributed to the early demise of my ball joints, unit bearings and rear axle shafts (bent flanges). Soon to follow will be tie rod & drag link joints.

If you're OK with the wear/tear of the 14.5" wide then go for it. Just understand up front that things WILL fail.

Another point: you really need to upgrade your brakes with that heavy of a tire. A 15" wheel won't fit any brake upgrades (that I know of)

Good luck!
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Old 12-28-2015, 11:35 AM   #4
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Option 1 may look cheaper now bro but will cost you more in the end both in time and money. If you like changing your unit bearings, axle shaft/ujoints and balljoints more than go for it but those parts are not cheap. Neither is tie rod ends. For a 14.5 wide tire you will have to run 1.5" of backspacing or less. For a traditional 37x12.50 you can run 3.5" of backspacing and that will prolong the life of those components due to less leverage and less weight. You may as well run 40s if your going to go with a 14.50 wide tire
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Old 12-28-2015, 11:59 AM   #5
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I went from 35s on 15" wheels to 17s and 37s. It was a no brainer for me, since I'll be going to a beefier tie rod and drag-link once my stock ones fail. 15" wheels don't allow for anything bigger than stock unless you are running really low back space wheels. Also looking to upgrade to bigger brakes in the near future, again cant do with 15s...
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Old 12-28-2015, 12:19 PM   #6
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Quote:
Originally Posted by Cameron138 View Post
Going up to 37s on my 2 door. have already armored up and I'm ready to make the jump from 35s. I currently have 15x10 inch wheels that I love. Here are my options:

Option 1:
Keep my wheels and save money, and get TOYO 37x14.5x15s (which the tires are cheaper then option 2 as well)

Option 2:
Get the normal 37x12.5x17 TOYOs and have to pay more for the tires, as well as get new 17 inch rims. A lot of money I don't think I need to pay.

Anyone want to talk me out of the option 1? It seems solid to me.
Nothing wrong with option 1 if you are equipped to handle it. As stated above and exaggerated with 15's due to the low back spacing, you are going to be brutal on ball joints, tie rod ends, etc...
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Old 12-28-2015, 01:20 PM   #7
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Originally Posted by monte417 View Post
Option 1 may look cheaper now bro but will cost you more in the end both in time and money. If you like changing your unit bearings, axle shaft/ujoints and balljoints more than go for it but those parts are not cheap. Neither is tie rod ends. For a 14.5 wide tire you will have to run 1.5" of backspacing or less. For a traditional 37x12.50 you can run 3.5" of backspacing and that will prolong the life of those components due to less leverage and less weight. You may as well run 40s if your going to go with a 14.50 wide tire
Yep

With 15" wheels you can't upgrade your tie rod or anything either
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Old 12-28-2015, 03:03 PM
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Yep With 15" wheels you can't upgrade your tie rod or anything either
this was a downside I saw. I have a few spare stockers but didn't like that I can't get RK or something nice
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Old 12-28-2015, 03:08 PM   #9
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i wouldn't want that wide of tire, but that i just me. road noise and wear and tear is going to be brutal.

i am in the market, or will be for 37s soon and went through all this. im going with nitto trail grapplers (they look wider than 12.5 if its the look you want) and some TR beadlocks.

so as far as your post, i know it hurts, but go with 37s on 17s, width is up to you. finding used rims, depending on your area, could be cheap. ill sell you mine ... plus now you have a complete set of wheels with 35s to sell used to help the cost of the new 37s (unless the 35s are completely worn?)
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Old 12-28-2015, 06:59 PM
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Thanks for all the replies. I'm going to pony up and get the 17s. I have a set of rubicon wheels so I'll rock some spacers for a bit until I can buy the beadlocks I want. ( I don't like buying things twice).

Now:

Option 1: TOYO 37x13.5x17

Option 2: NITTO 37x12.5x17

TOYOs are actually cheaper. Very similar. Just one inch wider. You think I will be ok with the TOYOs there?
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Old 12-28-2015, 07:28 PM   #12
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im partially biased

some good facs here, ignore the opinions

but i know toyos are awesome tires as well
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Old 12-28-2015, 09:00 PM   #13
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I'd be looking for the narrowest, lightest tire in your desired height.

I'd accept more cost and even slightly less tread performance for weight savings. Not try to save a few bucks and accept weight and width that are detrimental to the rest of the rig.
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Old 12-29-2015, 03:39 AM   #14
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Consider the handling with a 14.5 wide tire
I have done 36x13.5 and they were truly awful, especially on 15" wheels.

The 12.5's on 17's are the only way to go. Good choice for you to go with IMHO.
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Old 12-29-2015, 07:46 AM   #15
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The Nittos are wider than 12.5. I think they are about 13.4. Tire width they round down. Tire diameter they round up (I think Nittos are about 36.9 so close to a true 37).

On the rocks, the Nittos blow the Toyos away big time. But both are very heavy tires.
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Old 12-29-2015, 07:49 AM   #16
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PS most tire shops will not mount a 12.5 wide tire on a stock width wheel.
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Old 12-29-2015, 08:11 AM   #17
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14.50's just look too wide. 37x12.50's look perfect, will track better, and will be lighter. A narrower 17" alloy wheel will be lighter than the 10" wide wheels you run now. When running 37's, saving weight is worth the cost. You'll only end up with a more durable, better driving Jeep.
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Old 12-29-2015, 08:14 AM   #18
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The Nittos are wider than 12.5. I think they are about 13.4. Tire width they round down. Tire diameter they round up (I think Nittos are about 36.9 so close to a true 37).

On the rocks, the Nittos blow the Toyos away big time. But both are very heavy tires.
no shit, never noticed: Tread width (in): 13.43 ... interesting.
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Old 12-29-2015, 01:01 PM   #19
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FWIW, 4wheelparts.com had Mickey Thompson MTZ 37x12.5x17 on closeout for $281 each a month ago. I had Discount Tire Direct price match and sell me Fuel Beast wheels. The package of 5 wheels/tires and lugs was about $2450. I thought that was a great deal on a great tire. I'd consider that tire and if you can still get it from any online vendor DTD will match the price. They were super easy to work with and took care of me plus you get a forum discount. I worked with Frank at x51890.

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