245 or 255 - JeepForum.com

 
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post #1 of 13 Old 02-07-2012, 07:37 PM Thread Starter
WKFusion
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245 or 255

I see that under the sticky the WK can have up to 255/65-17. The question is, I want these tires which are Falken Rocky Mountain ATS-- for a stock 3.7. I want to get 255 but what will I be sacrificing??
Trans issues?
suspension issues?
and the obvious MPG?

I've searched and havn't got a clear answer. Hopefully this will answer other stock 3.7l guys.

2006 Jeep Cherokee 3.7L V6 STOCK (245/65 or 255/65?)

..Thanks a ton!


2006 Cherokee Laredo 3.7L Current Mods:
Tinted windows/sun visor / HID KIT / Custom CAI / Pinch weld mod / 1.5'' Spacers / 265/70/17 -- Wrangler Authority / Hypertech / 2'' RC
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post #2 of 13 Old 02-07-2012, 07:41 PM
meep
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you can also do a 245-70 which is a little taller than the 255-65.

wider tires don't track as straight on a hwy. They won't really impact mpg or suspension that much in such a mild change. Wider tires add air resistance but within reason also can yield less flex = less rolling resistance which can compensate. if they are heavier you may feel it at the wheel. Anything will be heavier than stock forteras.
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post #3 of 13 Old 02-07-2012, 07:42 PM Thread Starter
WKFusion
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OK so best decision 245-70.
Thanks meep your a great help

2006 Cherokee Laredo 3.7L Current Mods:
Tinted windows/sun visor / HID KIT / Custom CAI / Pinch weld mod / 1.5'' Spacers / 265/70/17 -- Wrangler Authority / Hypertech / 2'' RC
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post #4 of 13 Old 02-07-2012, 07:44 PM
mattydipps
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Quote:
Originally Posted by WKFusion View Post
I see that under the sticky the WK can have up to 255/65-17. The question is, I want these tires which are Falken Rocky Mountain ATS-- for a stock 3.7. I want to get 255 but what will I be sacrificing??
Trans issues?
suspension issues?
and the obvious MPG?

I've searched and havn't got a clear answer. Hopefully this will answer other stock 3.7l guys.

2006 Jeep Cherokee 3.7L V6 STOCK (245/65 or 255/65?)

..Thanks a ton!
i dont think your going to be "sacrificing" much by any means .. there are guys throwing 265/70/17s on their stock truck and getting away with it if your tranny goes because u stepped up to a 255... well it wasnt the tire that blew your tranny .. aj on here is running a 285/70 on his 3.7 flawlessly,

you may need to trim the ubj bolt to get those 255s to fit and you may need the pinch weld mod... and i dont think the mpgs from a 245 to a 255 will be THAT big ... of a difference to make you say ... "i shouldnt of done that" your speedo will need to be recalcd though

otherwise you have nothing to loose .. only to gain

Sold-
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post #5 of 13 Old 02-07-2012, 08:06 PM
fasteddiewk
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I am running 255/65/17 Kumho road ventures.....no problems...no rubbing...the openly problem I have is my wife took it to work one day and blew the tire out...otherwise no issues with the size
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post #6 of 13 Old 02-07-2012, 09:03 PM Thread Starter
WKFusion
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Quote:
Originally Posted by fasteddiewk View Post
I am running 255/65/17 Kumho road ventures.....no problems...no rubbing...the openly problem I have is my wife took it to work one day and blew the tire out...otherwise no issues with the size
do you have any pics

2006 Cherokee Laredo 3.7L Current Mods:
Tinted windows/sun visor / HID KIT / Custom CAI / Pinch weld mod / 1.5'' Spacers / 265/70/17 -- Wrangler Authority / Hypertech / 2'' RC
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post #7 of 13 Old 02-07-2012, 09:23 PM
Muddy4DSM
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Quote:
Originally Posted by WKFusion View Post
do you have any pics
Of the wife or the tire?

OO|||||||OO
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post #8 of 13 Old 02-07-2012, 11:47 PM Thread Starter
WKFusion
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Don't flatter me lol.
The tires lol! Cheers

2006 Cherokee Laredo 3.7L Current Mods:
Tinted windows/sun visor / HID KIT / Custom CAI / Pinch weld mod / 1.5'' Spacers / 265/70/17 -- Wrangler Authority / Hypertech / 2'' RC
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post #9 of 13 Old 02-08-2012, 06:41 AM
fasteddiewk
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i can try to get some this morning before i head out to work
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post #10 of 13 Old 02-08-2012, 09:01 AM
JRLT
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I'm running 255/55/18's. On the wheel calculator, they are only slightly smaller than the stock 245/65/17's.

http://www.miata.net/garage/tirecalc.html

2010 3.7L, 4XGuard Matrix, Fastman TB, TB Ground Mod, Injen CAI, 255/60/18 Nitto Terra Grapplers, Bilstein Shocks & Struts, Cruiser Alloy Wheels - Switchblade, Stillen Brakes, Cargo Light Strip Mod, Electric Ashtray Mod, Jet-powered, Monkey Navigated...
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post #11 of 13 Old 02-08-2012, 03:24 PM
RyanZJ
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Quote:
Originally Posted by WKFusion View Post
I see that under the sticky the WK can have up to 255/65-17. The question is, I want these tires which are Falken Rocky Mountain ATS-- for a stock 3.7. I want to get 255 but what will I be sacrificing??
Trans issues?
suspension issues?
and the obvious MPG?

I've searched and havn't got a clear answer. Hopefully this will answer other stock 3.7l guys.

2006 Jeep Cherokee 3.7L V6 STOCK (245/65 or 255/65?)

..Thanks a ton!
I'm running this exact setup on my wife's WK (size and tire). Looks good...a ton better than stock. I didn't notice too much of a difference other than the transmission shift points are a little off now. Doesn't make a big difference in everyday drive-ability, I just sometimes notice it on the highway with its 4-5 shift. Of course, we have the 4.7. Don't know how it would be with the V6.

Edit to add: I didn't notice much in the way of MPG drop. The vehicle has been less than stellar since day 1 in that category. If I were to adjust the MPGs by the % increase in tire circumference I think the difference would be negligible. No changes to suspension were necessary.

Ryan
'98 ZJ V8 Limited
'06 WK V8 Laredo
'51 CJ-3A

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post #12 of 13 Old 02-08-2012, 03:39 PM Thread Starter
WKFusion
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Alright cool guys. I'll definitely get some pics up of my jeep in a week or 2. I have some mods done.

2006 Cherokee Laredo 3.7L Current Mods:
Tinted windows/sun visor / HID KIT / Custom CAI / Pinch weld mod / 1.5'' Spacers / 265/70/17 -- Wrangler Authority / Hypertech / 2'' RC
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post #13 of 13 Old 02-08-2012, 04:37 PM
boykinjw
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I went from 235/65/17 to 245/70/17, I'm running Firestone destination ATs and I'm happy with the size and the tire.

2005 WK Hemi QDII
1999 XJ OME MD, 245/75/16 ST MAXX, ARB Bull Bar, Aussie Locker F&R
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