Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > Suspension/Driveline/Brakes/Wheels/Tires

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #13  
Old 10-24-2012, 09:30 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

The example I "drew " is because I dont have another way to draw it on the computer, Maybe when I can I will draw it out and scan it.

The perfect set up would give you just enough flex in the sidewall that the entire contact patch ( sidewall kickers and tread) contact the surface at the air-down amount, weather it is 10 psi or 3. so Ideally it is finding the correct pressure for the tire you are running. The 15" tire running 15 psi of pressure could be the same as a 20" running 20 psi as long as you avoid the tread buckling in the middle.

I just want to prove that he doesnt have to get rid of his 20" to go offroading . He just has to find the correct tire sidewall size that will give him the best contact patch on whatever he is running. ( Rocks, mud, etc.)

Yes 18" tires are cheaper to buy but if you have the rims , just buy the tires .
__________________

__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #14  
Old 10-24-2012, 10:50 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

I have been looking all morning for the damn article and I cant find it right now. I will continue to look to find it . ( so it may not get posted today but I am still looking)
__________________

__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #15  
Old 10-24-2012, 09:58 PM
Member
 
Join Date: Mar 2012
Posts: 155
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 1226
Alaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond repute
Re: Off road on your 20s?

You'll find the correct sidewall size for a 20" rim with a 40" tire.
__________________
Reply With Quote
  #16  
Old 10-25-2012, 12:28 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Quote:
Originally Posted by Alaska-HWY JK View Post
You'll find the correct sidewall size for a 20" rim with a 40" tire.
I am unsure about where the correct sidewall size would be? and as far as I knew , there were never really any sidewall width recommendations. I would think it would depend on the type of offroading he plans on doing.
Yes, you plan on running moab then i would suggest the largest sidwall possible and yes, i also would suggest the small size rim with the bigger tire but if he is just planning on hitting the fire roads or the lighter green trail with a smaller 2" lift and plans on running a 275-55-20 ( 31.9" ) tire ( example) should do him fine.


Let your Rig Grow as your experience increases . This way you can gain a better understanding of what you need to build for the next trail color. This will make you a better driver in end

Sent from my DROID X2 using Tapatalk 2
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #17  
Old 10-25-2012, 08:59 AM
Member
My Jeep: 2006 3.7L WK
 
Join Date: Dec 2010
Location: Memphis, TN
Posts: 202
Thanks: 49
Thanked 3 Times in 3 Posts
Rep Power: 1519
canis is on a distinguished road
Re: Off road on your 20s?

Okay I think I understand the gist of the article. So you can run any size rim you want as long as there is enough sidewall on the tire to allow for maximum contact patch. So as Alaska-HWY JK is saying (I think), you may need a 30" tire with a 15" rim or a 40" tire with a 20" rim. The larger the rim, the larger the OD of the tire to maintain the sidewall ratio.
__________________
canis: '82 CJ-7 w/5.9L & stuff (sold); '96 ZJ w/lift, gears, locker & stuff (sold); '06 WK (sold); '05 Subaru Legacy GT w/lots of track stuff (sold); '04 BMW 330i ZHP (work in progress); '14 WK2.5 v6 Overland 4x4 (current)
Reply With Quote
  #18  
Old 10-25-2012, 09:09 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

I have never heard of any type of formula for a side wall width . So that is a new one to me. I would like to read about it

but yes That is basically what it was about and as I said earlier. Some one going out and running Blacks or Reds or big rocks with no experiencing or little experience is just asking for a smashed up rig or worse getting hurt or hurting someone else.

You are better off starting small , you dont need 37" or 40" tires to run fire roads or Greens or even light blues and that is a good place to start and gradually work up to a the big rocks .

My 275-55-20 have 5" of side wall with Nitto 420s . If he were to buy a M/T ( BFG KM , Interco M/T ,Etc) that distance would be larger due to the way MFg's measure their tire heights .

So it will also depend on the trails he plans on running .

Tires are a science on them self , a wrangler that weighs 3000 lbs will work better with style tire where a GC that weighs 5000 lbs will not hook up at all. There are alot of variables
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #19  
Old 10-25-2012, 09:46 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

If you read aspect Ratio here It sort of explains the new larger rim and tire combos. This was not the article but it helps with the thinking.
3 Upgrades to Improve Your Truck

Here is a good Tire review site and basic info for off-road tires

Mud Tire Reviews, Offroad Tires, 4x4 Mud Tire Reviews - Offroaders.com

It takes some thinking and some research to pick the correct tire for the size , weight , terrain you plan on running
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #20  
Old 10-25-2012, 11:31 AM
Member
 
Join Date: Mar 2012
Posts: 155
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 1226
Alaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond reputeAlaska-HWY JK has a reputation beyond repute
Re: Off road on your 20s?

Here's a good read of you're thinking about offroading, if you're just driving off pavement 20s will be fine.
www.jpmagazine.com/.../wheels/...choosing_your_next_wheels/view
__________________
Reply With Quote
  #21  
Old 10-25-2012, 11:34 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

link .. not work
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #22  
Old 10-25-2012, 11:39 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

Choosing Your Next Wheels - Jp Magazine

got it
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #23  
Old 10-25-2012, 11:49 AM
spyder873's Avatar
Super Moderator
My Jeep: 2005 5.7L WK
 
Join Date: Aug 2012
Location: Pittsburgh, Pa
Posts: 2,396
Thanks: 44
Thanked 36 Times in 34 Posts
Rep Power: 290335
spyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond reputespyder873 has a reputation beyond repute
Garage
Re: Off road on your 20s?

Ok , I see where you are getting your formula but that method is not always practical. You are limited by lift size , body style , Cost , etc.

On a wrangler you will have much more room to play then on a GC. As stated above If you are pounding on rocks , The more rubber the better but if you are doing light off roading or even mild trails .You should be fine with the 20's with a different style tire, of course

There is always the option of buying a crap set of stock 17"s for your offroading and keep the 20's for when you are not wheelin....
__________________
2005 Jeep Grand Cherokee , 5.7 hemi,Blistein HD shocks and struts , Eibach pro-kit , 20" SRT Reps, Nitto NT420s 275-55-20 tires, AFE stage 2 dry cold air kit Billet Technology catch can , Imatation leather disco steering wheel cover ..... more to come
Reply With Quote
  #24  
Old 10-26-2012, 02:34 PM
Member
 
Join Date: May 2012
Posts: 582
Thanks: 0
Thanked 6 Times in 6 Posts
Rep Power: 15534
DirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond reputeDirtyDuc83 has a reputation beyond repute
Re: Off road on your 20s?

Thanks for all of the info guys. I think Dollar's thread helped me out a bit. I'm on the Quadra-Lift so limited to a max of 32" diameter. 40" tires would definitely not work out. I think for my 15 - 20% time spent off-road my 20s will probably be just fine. I was just hoping for more real life examples of people taking their 20s offroad.
__________________

__________________
2012 Stone White Overland Hemi ~ Altitude grill and brow ~ SRT8 reps ~ Falken Rocky Mountain ATS ~ Mopar pedals ~ SRT8 side lettering ~ 20% tint all around ~ Volant CAI ~ HF Tune
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
20s on a WK mexmex101 Wheels and Tires 11 05-21-2012 10:30 PM
lifted on 20s dykmankey Suspension/Brakes/Wheels/Tires 17 01-30-2012 12:00 PM
How much are my 20s worth Learo2000GT Suspension/Driveline/Brakes/Wheels/Tires 12 10-27-2011 08:51 AM
20s or 22s? bmwdc24 Wheels/Tires 8 06-20-2011 08:16 PM
my MK Patriot on 20s! jeelo Members Rides 18 09-02-2009 04:28 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:06 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community