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So what’s the minimum lift I’d need for that? I’m looking to only lift the truck what I need to. 

Id say 6”


2017 Chevy Silverado LTZ Z71 6.2L
4.5" Zone w/ Bilstein and Fox
22x10 American Force Grips
33x12.5 Nitto Ridge Grapplers
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9 hours ago, StevenStarke said:

So are you saying I can fit a 35" tire on my 2019 with just a leveling kit? I want to put on a 22x12  -44  with a 35" tire 

Apparently 35's fit on the AT4 without any level or lift.  There's a post in another thread with the pictures, and I've spoken to the shop who did it.

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That’s because you’re going to need much more lift height to fit a 22”X12 -44 with a 35” tire than you would with let’s say a 20”X9 with 0 offset with same size or slightly shorter tire. Best bet would be to call your local shop that does lifts/tires or an online retailer.

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17 hours ago, KA0S said:

Apparently 35's fit on the AT4 without any level or lift.  There's a post in another thread with the pictures, and I've spoken to the shop who did it.

Frustrating as there are many conflicting statements regarding tire fitment on the AT4 and Trailboss.

 

Rough Country said the biggest they could fit on a 2019 Trailboss is 285/65/18 which is only a 32.6" tall tire.....

 

 

 

 

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Frustrating as there are many conflicting statements regarding tire fitment on the AT4 and Trailboss.
 
Rough Country said the biggest they could fit on a 2019 Trailboss is 285/65/18 which is only a 32.6" tall tire.....
 
 
 
 
I hear you. Maybe it's a width issue?

I can't really say. All I know is the AT4 has its 2" factory lift, and this shop swapped off the stock 275/60/20 for some 35" tires on the stock rims. I have attached an image showing this swap..3cddc6ee3974e9a0d0a6cf255833ff9d.jpg

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29 minutes ago, rikhek said:

Frustrating as there are many conflicting statements regarding tire fitment on the AT4 and Trailboss.

 

Rough Country said the biggest they could fit on a 2019 Trailboss is 285/65/18 which is only a 32.6" tall tire.....

 

 

 

 

 

14 hours ago, StevenStarke said:

There’s some real conflicting info in this thread, lol. Some say 4”. Some say stock height. Some say 6”

 

 

It all depends on the width of the rim and the offset it has.  For example,  I am running 33.5"x12.5 on my '19 Trailboss.  There is very minimal rubbing but the rim is a 20x9 with 0 mm offset.  In order to fit 35s you will need either a 4" inch lift on a non-Trailboss/AT4 or a level on a Trailboss/AT4.  That being said, it will only fit 35x12.5 tires with a 20x9 rim and 0 mm offset(will rub very slightly).  If you attempt this lift and tire setup but run a 20x12 or 22x12 rim, it will have -44 mm offset and will NOT fit unless you have at least 6" of lift on a non-Trailboss/AT4.  Also, the Sierra has a different wheel well opening then the Silverado so it is possible that you may not be able to run as large a tire on a Sierra as you can run on a Silverado.

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It all depends on the width of the rim and the offset it has.  For example,  I am running 33.5"x12.5 on my '19 Trailboss.  There is very minimal rubbing but the rim is a 20x9 with 0 mm offset.  In order to fit 35s you will need either a 4" inch lift on a non-Trailboss/AT4 or a level on a Trailboss/AT4.  That being said, it will only fit 35x12.5 tires with a 20x9 rim and 0 mm offset(will rub very slightly).  If you attempt this lift and tire setup but run a 20x12 or 22x12 rim, it will have -44 mm offset and will NOT fit unless you have at least 6" of lift on a non-Trailboss/AT4.  Also, the Sierra has a different wheel well opening then the Silverado so it is possible that you may not be able to run as large a tire on a Sierra as you can run on a Silverado.
The stock 20" rim is a 9.5". I don't know the offset though. So I assume this is why there is no modifying needed to fit the 35" tires?

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1 minute ago, KA0S said:

The stock 20" rim is a 9.5". I don't know the offset though. So I assume this is why there is no modifying needed to fit the 35" tires?

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Correct, the stock offset is around 20-30 mm depending on which rim you choose.  That is why he was able to fit a 35.  I can't tell 100% from the picture but the 35s on the blue AT4 may not be 12.5 wide either.  

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Correct, the stock offset is around 20-30 mm depending on which rim you choose.  That is why he was able to fit a 35.  I can't tell 100% from the picture but the 35s on the blue AT4 may not be 12.5 wide either.  
Thanks for clarifying.

I'm basically looking to go with an 18 on mine with a 35" tire. So I'll have to do some research as to what fits. Unless you know off hand?

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17 hours ago, KA0S said:

Thanks for clarifying.

I'm basically looking to go with an 18 on mine with a 35" tire. So I'll have to do some research as to what fits. Unless you know off hand?

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With an 18, the sizing is slightly different.  An 18x9 Rim such as this Fuel one below(1st pic) comes in three offset sizes: -12, 1, and 20.  If you want it to fit on a 35 on a non-Trailboss/AT4, your best bet is to go with a 4 inch lift and the 1 or 20 mm offset.  The 20 mm offset may or may not fit with a level, but it would be a close one and I am sure you don't want to buy a level only to find out it wont fit and have to buy a 4 inch lift on top of that.  The difference between the 20, 1, and -12 in terms of looks only is that the 20 mm will have the face of the rim towards the outer edge (stock appearance), the 1 mm will have the face of the rim almost exactly in the middle of the rim with almost equal lip on both sides, and the -12 (1st pic below) will have more lip on the front side of the rim and the face pushed back farther.  The -12 mm is pushing the tire out too far and will rub on a 4 inch lift with 35x12.5 tires.  Any other questions, let me know.

 

image.png.942a6c904ec25275fdcb317ee2ceb660.png

 

image.thumb.png.3210c6b3baf496dca23f4bfbd04f3384.png

Edited by z1boss
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With an 18, the sizing is slightly different.  An 18x9 Rim such as this Fuel one below(1st pic) comes in three offset sizes: -12, 1, and 20.  If you want it to fit on a 35 on a non-Trailboss/AT4, your best bet is to go with a 4 inch lift and the 1 or 20 mm offset.  The 20 mm offset may or may not fit with a level, but it would be a close one and I am sure you don't want to buy a level only to find out it wont fit and have to buy a 4 inch lift on top of that.  The difference between the 20, 1, and -12 in terms of looks only is that the 20 mm will have the face of the rim towards the outer edge (stock appearance), the 1 mm will have the face of the rim almost exactly in the middle of the rim with almost equal lip on both sides, and the -12 (1st pic below) will have more lip on the front side of the rim and the face pushed back farther.  The -12 mm is pushing the tire out too far and will rub on a 4 inch lift with 35x12.5 tires.  Any other questions, let me know.
 
image.png.942a6c904ec25275fdcb317ee2ceb660.png
 
image.thumb.png.3210c6b3baf496dca23f4bfbd04f3384.png
Thanks for the in depth reply.

It's an AT4 and I'm looking to use the stock 18x8.5" rim for the time being, but wrapping them with 35" tires.

Let me know what you think as far as tire size goes.. I'd like to get the widest possible without rubbing.

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1 hour ago, KA0S said:

Thanks for the in depth reply.

It's an AT4 and I'm looking to use the stock 18x8.5" rim for the time being, but wrapping them with 35" tires.

Let me know what you think as far as tire size goes.. I'd like to get the widest possible without rubbing.

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With the stock 18x8.5, the widest size tire you could put on it would be a 12.50.  That being, you should be able to fit 35x12.50 tires on the AT4 without lifting it at all, as long as you use the stock rims.  There may be a slight rub at full lock.  If it does slightly rub and you don't like the rub, just level the truck with any available kit ($60) and you should be all set.  

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With the stock 18x8.5, the widest size tire you could put on it would be a 12.50.  That being, you should be able to fit 35x12.50 tires on the AT4 without lifting it at all, as long as you use the stock rims.  There may be a slight rub at full lock.  If it does slightly rub and you don't like the rub, just level the truck with any available kit ($60) and you should be all set.  
Awesome! That's the info I was looking for. I was hoping to get some 12.5" so I wasn't driving around on pizza cutters. Hahaha!

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4 minutes ago, KA0S said:

Awesome! That's the info I was looking for. I was hoping to get some 12.5" so I wasn't driving around on pizza cutters. Hahaha!

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No problem.  I agree the stock tires, even on the Trailboss/AT4, are tiny.

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