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Unread 06-06-2013, 04:34 PM   #1
DRT500
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Tire difference

I have 33x12.5x15's now on Dick Cepek DC-2 15x10" wheels. They where on it when I bought it, but they are wore out and I will be needing some before fall. Here is what Ive been thinking. Give me your opinion and why. Feel free to be detailed. I'm new to jeeps and details help me understand. Thanks in advance.


1. the same thing, only draw back is they seem to bog down the motor some and mpg is around 13-15. it has 4.0

2. 33x10.5x15, on know this is kinda taboo here, but my tire shop said it would be no problem. This jeep is my daily driver, 15-20 miles a day, and I drive it on our farm around logging roads hunting. Some trials with only mud. thought this narrow tire would help my mpg and power. Am I correct in this????

3. 32x11.5x15, more choices on this than #2. Would this help power and mpg????

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Unread 06-07-2013, 12:52 AM   #2
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I think 32x11.5 would be better for you than a 33x10.5 for 2 reasons:

1) the 11.5 will fit better on your 10" wheels than a 10.5" tire. IMO, you would be better of dropping back to an 8" wide wheel, but I realize this can potentially be an large unnecessary cost.

2) I believe you would notice more of an increase in on road performance with a 1" drop in height than the extra 1" loss of width.
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Unread 06-07-2013, 08:08 PM   #3
tyvanwie
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Don't go any less than 12.5" width because of the 10" wide wheels. And the reason it's sluggish is because I doubt the PO or you regeared it.

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Unread 06-08-2013, 11:59 AM   #4
Charley3
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I suggest 31 x 10.5 R15 on 15 x 8 wheels for an ideal setup.

There are several tire brands-models known to run on the tall side for a 31. One of those would be perfect for you, IMO.

That's ^ if you get 15 x 8 wheels (preferably stock Wrangler wheels, IMO).

If you continue to use 15 x 10 wheels, then I suggest 32 x 11.5 R15 tires. A 10" wide tire is fine with an 11.5 wide tire, IMO.
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Unread 06-08-2013, 12:01 PM   #5
tyvanwie
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Quote:
Originally Posted by Charley3
I suggest 31 x 10.5 R15

There are several brands known to run on the tall side for a 31. One of those would be perfect for you, IMO.

32 x 11.5 R15 would be OK too, but I think 31 would be best.
On a 10" wide rim? Why?

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Unread 06-09-2013, 09:28 AM   #6
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Look at the spec the tire mfg gives for the tires you're interested in. That will tell you the range of rim width that is recommended for a particular tire. Rim width directly affects contact patch at a specific pressure. Running too narrow a tire on a wider rim results in the need for higher pressure or the center of the tread doesn't contact as well as the edges do. For too wide a tire on a narrow rim the pattern issues are swapped. That is one of the reasons why some Jeepers run different pressures with the same tire. Tire pressure can also affect things like ride/handling, tire wear, fuel economy, and so forth.
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Unread 06-14-2013, 11:27 PM   #7
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Quote:
Originally Posted by tyvanwie View Post
On a 10" wide rim? Why?

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I didn't see 10" wide wheel. I missed that part. But then you pointed that out. So I revised my earlier post.
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Unread 06-15-2013, 06:50 AM   #8
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Quote:
Originally Posted by Charley3

I didn't see 10" wide wheel. I missed that part. But then you pointed that out. So I revised my earlier post.


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Unread 06-15-2013, 04:37 PM   #9
Charley3
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For a 15 x 10 wheel, get a 32 x 11.5 R15 tire.

That's your cheapest solution since you have 15 x 10 wheels. That would greatly improve your power and gas mileage compared to 33 x 12.5 R15.

---

If you had 15 x 8 wheels, then I'd say get 31 x 10.5 R15.

---

The above is what I meant to say in my first post. I restated it here in an easier to understand explanation (I hope).
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Unread 06-15-2013, 11:16 PM   #10
DRT500
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Well I went today to price some tires and see if I could by another wheel like the ones I have for a spare, and ran into a little bit of a snag. The Dick Cepek DC-1's that are were on the jeep when I bought it have been discontinued. I have been trying to find a used one somewhere but have had no luck. So here is a scenario for you guys to in-lighten me on. If I buy 4 32x11.5x15's and leave my stock spare as it is, then I get a flat on a rear tire can I run the spare which is smaller with out hurting anything?

The guy at the tire shop did quote some 15x8 MB wheels for 93.00 each in black that I like, but buying 5 new wheels and 5 new tires just isn't possible at this time. The tires are pretty wore but I have a little while before I replace them, probably around September or October. Again lets hear your opinions, and thanks in advance.
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Unread 06-16-2013, 08:14 PM   #11
Charley3
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Smaller spare is no problem if you don't have a limited slip differential.

i.e. - fine with open differential.

---

If you get 15 x 8 wheels for 31 x 10.5 R15 tires, the stock 15 x 8 Wrangler wheels are ideal for that tire size.

Go to the Classified section of this forum, subsection Tires and Wheels and you can find lots of stock 15 x 8 aluminum wheels that came off Wranglers. Just make sure to ask about condition, and ideally inspect before buying, if possible.

http://www.jeepforum.com/forum/f125/

Also, check Craigslist, Ebay, and other Jeep forums' classifieds.

They are often described by name. Look for these wheel names: Ravine, Canyon, Gambler.
There are other Wrangler 15 x 8 aluminum wheels with other names that would be good too, but I can't remember their names.

15 x 8 are better than 15 x 7 for 31 x 10.5 R15 tires, IMO.

Get aluminum (also called alloy) wheels, not steel wheels. Aluminum look way better and you'll get slightly better gas mileage.
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Unread 06-16-2013, 08:22 PM   #12
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P.S. - those same JeepForum classifieds, Ebay, Craigslist, and other forums' classifieds are good places to get good wheels cheap and good tires cheap.

Often the wheels and tires are offered together.

Used stock Wrangler wheels and 31 x 10.5 R15 tires are cheap, abundant, and often in good condition. It's common to see tires for sale with 85% to 95% tread left. Sometimes the tires have only 1 to 3 thousand miles on them.

This is great news for you because stock Wrangler 15 x 8 aluminum/alloy wheels and 31 x 10.5 R15 tires would ideal for you.
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Unread 06-17-2013, 06:43 AM   #13
DRT500
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Quote:
Originally Posted by Charley3 View Post
Smaller spare is no problem if you don't have a limited slip differential.

i.e. - fine with open differential.

---

If you get 15 x 8 wheels for 31 x 10.5 R15 tires, the stock 15 x 8 Wrangler wheels are ideal for that tire size.

Go to the Classified section of this forum, subsection Tires and Wheels and you can find lots of stock 15 x 8 aluminum wheels that came off Wranglers. Just make sure to ask about condition, and ideally inspect before buying, if possible.

http://www.jeepforum.com/forum/f125/

Also, check Craigslist, Ebay, and other Jeep forums' classifieds.

They are often described by name. Look for these wheel names: Ravine, Canyon, Gambler.
There are other Wrangler 15 x 8 aluminum wheels with other names that would be good too, but I can't remember their names.

15 x 8 are better than 15 x 7 for 31 x 10.5 R15 tires, IMO.

Get aluminum (also called alloy) wheels, not steel wheels. Aluminum look way better and you'll get slightly better gas mileage.
How do I know which differential I have?
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Unread 06-17-2013, 04:55 PM   #14
Charley3
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Other guys here are more qualified to answer that. I don't know an easy way to tell.
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Unread 06-18-2013, 07:25 AM   #15
DRT500
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Im going today and see if I can get 12 months 0%. If so I'm going to get the new wheels (15x8), and some 32x11.5x15's.
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