275-55-20 BFG T/A KO2 on stock rims - Page 6 - Jeep Garage - Jeep Forum

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  #61  
Old 06-01-2016, 06:57 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

For anybody still interested in this topic, I have a 2014 Overland with 275/55R-20 BFG KO2 installed on the stock wheels and have had no rubbing in any height position. I have been off road a few times and have encountered no rubbing. Granted I have not tried to baja race over major woops, but I have had no issues.

Also, in terms of sound difference between the Forteras and the KO2s, I can tell you subjectively the KO2s are noticeably louder at highway speeds. I took some sound decibel readings using an iPhone app (Decibel 10th) with the stock Goodyear Forteras and the KO2s going 65mph on a stretch of highway. The app is limited to recording the max reading, the at the moment decibel reading, and the peak decibel. I took multiple before and after recordings. Here are the averages:

Average Decibel With Goodyear Forteras:

Max DB: 87
At the moment DB Reading: 59
Peak DB: 71

Average Decibel With BFG KO2s:

Max DB: 83.5
At the moment DB Reading: 74
Peak DB: 79.75

Take these readings with a grain of salt, as they were not recorded with a true decibel meter and there is no way to capture an average decibel reading over a period of time with this app.

Lastly, as most have pointed out already, your speedo will be off by about 5% with the 275/55R-20 size tire. I confirmed this with a GPS speedometer. Wit the taller tire, when your speedo says 62, you are actually travelling around 65mph.

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  #62  
Old 06-02-2016, 12:41 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

The speedo being off is not something I want to deal with I don't think and the KO2's on a HA is not the look I would be going for. I loved the KO2's on my Rubicon though.
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  #63  
Old 06-02-2016, 01:09 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

Quote:
Originally Posted by cjgibbs1985 View Post
For anybody still interested in this topic, I have a 2014 Overland with 275/55R-20 BFG KO2 installed on the stock wheels and have had no rubbing in any height position. I have been off road a few times and have encountered no rubbing. Granted I have not tried to baja race over major woops, but I have had no issues.

Also, in terms of sound difference between the Forteras and the KO2s, I can tell you subjectively the KO2s are noticeably louder at highway speeds. I took some sound decibel readings using an iPhone app (Decibel 10th) with the stock Goodyear Forteras and the KO2s going 65mph on a stretch of highway. The app is limited to recording the max reading, the at the moment decibel reading, and the peak decibel. I took multiple before and after recordings. Here are the averages:

Average Decibel With Goodyear Forteras:

Max DB: 87
At the moment DB Reading: 59
Peak DB: 71

Average Decibel With BFG KO2s:

Max DB: 83.5
At the moment DB Reading: 74
Peak DB: 79.75

Take these readings with a grain of salt, as they were not recorded with a true decibel meter and there is no way to capture an average decibel reading over a period of time with this app.

Lastly, as most have pointed out already, your speedo will be off by about 5% with the 275/55R-20 size tire. I confirmed this with a GPS speedometer. Wit the taller tire, when your speedo says 62, you are actually travelling around 65mph.
Great info,thanks
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  #64  
Old 06-23-2016, 02:28 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

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Originally Posted by BrentwoodBob View Post
Great info,thanks

Glad to help.

All in all, if you are looking for an AT tire, the KO2 is great. Plus, it's a very common tire size, so it's easy to find.




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  #65  
Old 09-16-2016, 06:25 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

This has been a great discussion. After much consideration between the Duratrac and KO2 I decided to put the KO2 275/55R20 on my 2014 Jeep Summit 5.7L and already love them. Here are some pictures and first observations. I have gone 0-75 MPH so far. Tire are at 36 PSI.

1) They look awesome
2) They fit just fine on my factory 20 inch rims. I when around in circles in exit mode (QL) right after I put them on and not on thing was rubbing. The closest spot was the picture of the bolt for the shock.
3) They are bigger than factory and you can tell. Gives it more of a truck feel but I like the way rides.
4) Road noise isn't a issue. I do have the 5.7L and put on a K&N performance air intake and long with my flow master pipes, I don't hear and additional noise unless I stick my head and there a slight noise as expected.
5) No vibration in the steering from the 4.8% larger tire than factory.
6) The tire is heaver so I don't try to accelerate as fast as I use to. Stopping isn't an issue.

I will be taking up in the Rocky Mountain off roading this weekend and looking forward to see how they perform.
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  #66  
Old 11-09-2016, 06:46 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

Quote:
Originally Posted by Gooter View Post
This has been a great discussion. After much consideration between the Duratrac and KO2 I decided to put the KO2 275/55R20 on my 2014 Jeep Summit 5.7L and already love them. Here are some pictures and first observations. I have gone 0-75 MPH so far. Tire are at 36 PSI.

1) They look awesome
2) They fit just fine on my factory 20 inch rims. I when around in circles in exit mode (QL) right after I put them on and not on thing was rubbing. The closest spot was the picture of the bolt for the shock.
3) They are bigger than factory and you can tell. Gives it more of a truck feel but I like the way rides.
4) Road noise isn't a issue. I do have the 5.7L and put on a K&N performance air intake and long with my flow master pipes, I don't hear and additional noise unless I stick my head and there a slight noise as expected.
5) No vibration in the steering from the 4.8% larger tire than factory.
6) The tire is heaver so I don't try to accelerate as fast as I use to. Stopping isn't an issue.

I will be taking up in the Rocky Mountain off roading this weekend and looking forward to see how they perform.

Your Jeep looks great. What is the offset of your summit wheels?
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  #67  
Old 11-10-2016, 07:49 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

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Originally Posted by PZengel View Post
Your Jeep looks great. What is the offset of your summit wheels?
All the OEM wheels are the same offset, and someone can correct me if I'm wrong, but I want to say +56?
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  #68  
Old 11-10-2016, 06:16 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

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Originally Posted by CG27519 View Post
All the OEM wheels are the same offset, and someone can correct me if I'm wrong, but I want to say +56?
You are correct. I will be running 275/60/20 ko2's on factory wheels with an 1.5" spacer and about 3" of lift in the near future. I have everything but the front 5100's. They're on backorder for another month.
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  #69  
Old 11-11-2016, 07:31 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

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Originally Posted by vtec187 View Post
You are correct. I will be running 275/60/20 ko2's on factory wheels with an 1.5" spacer and about 3" of lift in the near future. I have everything but the front 5100's. They're on backorder for another month.
That's going to look awesome! When I got the 275/55/20 ko2's for my 2012, I wanted to look into the next size up but opted for the smaller ones. I'll be very interested to see your setup.

Are you worried about the extra weight? I know the 275/55/20's were considerably heavier than the stockers, so the 275/60/20's will be even heavier than that. Just food for thought!
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Old 11-11-2016, 07:41 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

Quote:
Originally Posted by CG27519 View Post
That's going to look awesome! When I got the 275/55/20 ko2's for my 2012, I wanted to look into the next size up but opted for the smaller ones. I'll be very interested to see your setup.

Are you worried about the extra weight? I know the 275/55/20's were considerably heavier than the stockers, so the 275/60/20's will be even heavier than that. Just food for thought!
I'm not worried about it. I have an Rx-7 for when I want to go fast.
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  #71  
Old 11-14-2016, 11:06 AM
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Re: 275-55-20 BFG T/A KO2 on stock rims

Newbie here. Wife has a 2014 eco summit. Guys running the 275/55r20 ko2 what's the fuel mileage difference you have seen? Thanks.


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  #72  
Old 11-30-2016, 05:14 PM
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Re: 275-55-20 BFG T/A KO2 on stock rims

I've done a ton of reading and decided to order my 275/55/20 KO2's today.

Some things I've learned (without testing; just researching forums and calling my dealer):
1. 275/55/20's fit fine and don't rub
2. 275/55/20's will reduce gas milage, impact speedometer and odometer readings
3. My dealer confirmed that they can reprogram my speedo/odo for the 275/55s and get it much closer than the ~5% off that's been reported in forums.
4. My dealer confirmed that they see no reason that the warranty would be void with upgrading to the larger size, and that they want me to put my WK2 through the paces off road/in snow/on the beach instead of let it wither away on daily commutes/errands. This made me much more comfortable to make the switch considering the fact that I've read some unhappy owners complain about QL failure.

What I plan to do next:

1. Before I install the tires, I'm going to run a few 0-60 sprints and do some MPG tests to get baselines.
2. After I install the tires, I'm going to repeat these tests and finally answer the questions "How much slower is it," and "How much is gas milage going to change."
3. Take lots of pictures of how sick my WK2 looks with the new shoes.
4. Report back after a few experiences in snow/dirt/sand to let you know what I think.

Stay tuned, people!

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