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Unread 02-07-2012, 07:37 PM   #1
WKFusion
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2006 WK 
 
Join Date: Sep 2011
Location: YPSILANTI, Michigan
Posts: 102
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!

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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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Unread 02-07-2012, 07:41 PM   #2
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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Unread 02-07-2012, 07:42 PM   #3
WKFusion
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OK so best decision 245-70.
Thanks meep your a great help
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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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Unread 02-07-2012, 07:44 PM   #4
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
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Unread 02-07-2012, 08:06 PM   #5
fasteddiewk
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Location: Pittsburgh, Pennsylvania
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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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Unread 02-07-2012, 09:03 PM   #6
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
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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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Unread 02-07-2012, 09:23 PM   #7
Muddy4DSM
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Quote:
Originally Posted by WKFusion View Post
do you have any pics
Of the wife or the tire?
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Unread 02-07-2012, 11:47 PM   #8
WKFusion
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Don't flatter me lol.
The tires lol! Cheers
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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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Unread 02-08-2012, 06:41 AM   #9
fasteddiewk
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i can try to get some this morning before i head out to work
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Unread 02-08-2012, 09:01 AM   #10
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
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Unread 02-08-2012, 03:24 PM   #11
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.
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Unread 02-08-2012, 03:39 PM   #12
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.
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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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Unread 02-08-2012, 04:37 PM   #13
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.
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