Offroad Trailblazers and Envoys

Maximum Trailblazer Tire Size without Modification

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by Trail X » Sun Feb 21, 2010 8:15 pm

This question comes up a lot. Instead of it being posted over and over, I figured I would answer it here.

The Trailblazer suspension has an overhanging upper ball joint.
Image

While it provides an excellent turning radius for the vehicle, it inhibits the user from going too large with the tires without making other modifications.

From what we at ORTB have measured and other people have reported, the maximum tire diameter without modification is 30.5".

This means one of the following tire sizes should fit without any modifications:

17"
245/70/17 = 30.50" diameter
255/65/17 = 30.05" diameter
265/65/17 = 30.56" diameter
285/60/17 = 30.46" diameter

16"
245/75/16 = 30.46" diameter
255/70/16 = 30.05" diameter
265/65/16 = 29.56" diameter
285/65/16 = 30.58" diameter

If you go over 30.5" diameter, we suggest wheel spacers and a lift. See the other sticky in this section for more information on wheel spacers.
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by Mooseknuckle » Mon Feb 22, 2010 10:36 pm

James,Thank you for this post. I have a few questions real quick if you don't mind.....I called Fred about the wheel adapters..I will call him back tomarrow it's getting late for me...anyway #1. If the tire I'm gonna get now is 30.6" couldn't I just use the wheel adapters for now so there would be no rub and essentially give me the space I need for that tire or no it doesn't work like that? #2 How much were your wheel adapters? I'm just trying to get A hold on how much everything will be minus the body lift.. Thank you!
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by Trail X » Mon Feb 22, 2010 11:27 pm

30.6" is one of those questionable sizes. More than likely it will fit without modification, but I cannot guarantee it. It will be very close.

Yes, you can run any size tires with wheel spacers. You don't HAVE to be over 30.5", but it doesn't make much sense to get it otherwise.

My wheel adapters were from Fred... $365 shipped. Wheel and hub centric. (keep in mind, that was a while ago, prices may change)
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by Mooseknuckle » Mon Feb 22, 2010 11:35 pm

so then I could get the wheel adapters and the Dur aTracs from GY and I wont have to do a suspension lift right now?
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by NY_TB » Mon Oct 18, 2010 3:12 pm

so if i get MarcMc's 2.5" lift what would be the maximum tire size i could put on? i have 17" rims...but if i get the max tire size would i have to do any cutting in the wheel well?
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by MrSmithsTB » Mon Oct 18, 2010 8:58 pm

Please see the first post regarding maximum tire size. The purpose of this thread is, in fact, to explain this. As far as cutting, it is handled on a case by case basis, as your particular tire choice in relation to your vehicle may affect it. Above all, please remember to read thoroughly before asking questions. Chances are that most have been answered already.
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by Trail X » Mon Oct 18, 2010 9:00 pm

The big question is... are you getting wheel spacers? If you are not getting wheel spacers, then your limits are as outlined above.

From then on out, your tire size limits are dictated by how much trimming you want to do, how wide your tires are, what your overall offset is... etc. No simple answer really. I recommend looking through the build threads to see what others have done.
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by kcb58h » Mon Jan 19, 2015 2:30 pm

With a R/C 2" level kit, I run a 265/65/18 BFG A/T T/A KO (31.56" dia.) on American Racing Marin 18" x 9", 6 x 5" wheels. This wheel is one of the few that fit TBs without spacers. Did cut 10" out of front fender wells. Didn't need to that cutting, needed to reset my bumper.
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by delliott1 » Tue Oct 09, 2018 1:24 am

Hi, Trailx thanks for the information on tire and wheel sizes for Trailblazer. Mine is 2014. Right now I am running Nitto All Season 285/45/22 and no rubbing. I want to change to a BFG A/T KO2. What is the largest tire rim combo I can install without any mods and what would be the correct offset? I would like to go no larger than 18" and Rim of choice is Fuel Vapor matt black. I am in Thailand and it really tough getting answers. So, if you can advise I sure would appreciate it. Thanks.
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by djthumper » Thu Oct 11, 2018 1:46 am

We don't really know anything about the new Trailblazer since we don't have it available to us over here.
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by cpyonker » Thu Oct 11, 2018 10:14 pm

I wish it was, I couldn’t afford it but it is 10x more truck like than the stupid traverse
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