I have a 2007 4wd trailblazer. I have a truxxx lift kit installed on it which is a suspension lift for 2.5inch in the front 1.25 in the rear. It sit perty much leveled. I am about to get 1.5inch wheel spacers installed and I just would like to know if I can fit 265/70/17 tire on stock rims. The tire I have been looking at is general grabbers at2. Please help
Biggest tire for lifted trailblazer and wheel spacers question
- Thread starter zombiexsoldier
- Start date
tbyoda
Member
- Apr 19, 2013
- 187
zombiexsoldier said:
Please take look at this thread, a lot of good data. OffRoad TB - View topic - Lift/Tire Size Chart
Max tire size dictated by the gearing for example 3.42 gears = max tire is 32" the 265/70R17 is 31.61" so with a 2.5" body lift and spacers you should be good with any fender cutting but look over the thread.
Offroadtb.com Tire Size Calculator
Offroadtb.com Gear Ratio Calculator
the roadie said:
o I seen you a lot on trailvoy but I don't think people use that anymore but would you know what this biggest tire I could fit?
Fit and USE are different things. Recommend reading the links.
Yah. We ALL moved here from trailvoy for good reasons. It's a ghost town now.
Yah. We ALL moved here from trailvoy for good reasons. It's a ghost town now.
c bausch
Member
- Jan 13, 2012
- 183
Well i had a 2.5 " lift with 285's a little fender plastic trim and they fit good . My profile picture is w/ the wheels and lift
HARDTRAILZ
Moderator
- Nov 18, 2011
- 49,665
265s rubbed with my 2.5 inch lift...
there is a ton of info available if you search. I believe evan a few charts of what fit and doesn't. Maybe even chart of who is running what.
there is a ton of info available if you search. I believe evan a few charts of what fit and doesn't. Maybe even chart of who is running what.
I've heard that rumor as well.HARDTRAILZ said:
Might even be an entire web site discussing lifts and offroading.
Pittdawg
Member
- Dec 5, 2011
- 538
zombiexsoldier said:
Roadie...correct me if I'm wrong but I seem to recall you posting awhile back a lift does nothing to change the proximity of the ball joint to the width of the tire correct? I.e., a lift may help with vertical clearance but in terms of going to a 265 or wider tire the lift does nothing?
That's the dirty little secret.Pittdawg said:
The challenge of the upper ball joint location is entirely defined by the steering knuckle design. A lift helps you not rub a larger tire on the fender well lining, but when you get over 30.5" diameter, the upper ball joint overhang is the ultimate restriction. Everybody contemplating larger tires needs to spend ten minutes looking the suspension over and understanding what dimensions change when it cycles up and down. The ball joint to corner of the tire dimension is defined entirely by the steering knuckle design. Wider and larger tires on the OEM rim will push the outer edge of the tire out and up, but the inner edge will go in and up. And that's where the ball joint lives. Aftermarket rims can push the entire tire outwards, but you have to do the backspacing math to see if it will hit.
Or put one on and try it if the math is too hard. 
Darkrider_LS
Member
- Jan 25, 2013
- 9,332
This much i have learned thus far from reading on both here and ortb. Max you can clear in stock config is 30.5-30.6 depending on tire. (Wrangler silent armors are 30.6 and i have seen them on stock TBs a few times now). Using Marks spacers on stock Full size or TB rims depending on which bolt pattern you go with gives you a 4.5 back space allowing a taller tire to be fitted to the TB. If im not mistaken this allows a 31" on a 2" lift and a 32" on a 2.5 and from the sounds of it around a 33" on a 3" lift. Gearing being your ultimate limitation. Here is a chart i found on another forum when i was asking what max tire size can be ran on what gearing on my full size truck.
Note: this is not the original, just an edited version showing ideal for what gearing from the looks of it.
On the chart...
Yellow means better fuel economy
Green is stock like gearing
Red is better suited to offroad conditions
Note: this is not the original, just an edited version showing ideal for what gearing from the looks of it.
On the chart...
Yellow means better fuel economy
Green is stock like gearing
Red is better suited to offroad conditions
Attachments
I dunno. PM him. The posted price is $219 and the quality is extremely high. Ebay vendors can be crooks. Mark invested in supplying parts for the platform when almost nobody else was, and deserves our support.
zombiexsoldier said:
I now have the tires and they fit with minimal trimming
View attachment 30489
View attachment 30490
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Pittdawg said:
this is with 1.5inch spacers and suspension lift there was minimal trimming the guy said who put it on for me he didnt charge me for trimming cause he only had to do slight trimming he said
HARDTRAILZ
Moderator
- Nov 18, 2011
- 49,665
I have 2.5 inch lift on 2007 trailblazer. Will 8x18 rims fit? And what size tire would any of you all suggest. Thanks
djthumper
Administrator
HARDTRAILZ
Moderator
- Nov 18, 2011
- 49,665
If the offset of the 18x8 is right, it may fit larger than 30.5 actually. We really would need more data to recommend a tire size.
paul2005tb
Member
I have a 3in body lift and a 3in suspension lift. I have Marks wheel spacers too. The only limitation I have is my 3.73 rear gear. Even though I drive like an old lady and never tow anything Im going to keep my tire diameter below 33.8. Im looking at 285/70/17 or 295/70/17 or 255/80/17.
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paul2005tb
Member
took a careful look up on that "chart of all charts" showing what tires folks with 6in lift and spacers are able to use. I did not see a match for my case. If you have a 6in lift (3in suspension, 3in body = 3+3 lift) and you have MarkMC wheel spacers can you tell me if you are running 33in or 34in tires and what width are you running. Id like to know if I can get up to 33/10, 33/11 or 33/12 without cutting any metal. My measurements suggest I can get 33/10 but that 33/12 will be too close with the upper ball joint even with the spacers and will very nearly interfer with the metal aft of the front wheels when the wheel turns. Well these are my deductions based on a tape measure.
If you have greater than a 32.7in tire on a 3+3 lift with wheel spacers without any cutting of metal please tell me what you have.
If you have greater than a 32.7in tire on a 3+3 lift with wheel spacers without any cutting of metal please tell me what you have.
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paul2005tb
Member
The chart is incredibly helpful but the word "trim" can mean so many different things, it would be great if the build notes gave more details for each of the specific cases.
For instance, I have (MarkMC) 3in body lift + 3in suspension lift + 1.5in spacers. My target tire/wheel is 33x11 with a zero offset rim.
I want to put 33x11 on the truck (I have the 3.73 gear and I have an auxillary trans cooler but I dont really tow anything) .
I have figured out that the 33x11 would fit if I were planning on using the OEM wheel offset but figuring out the clearance with a zero offset wheel (effectively a loss of almost 2inches of positive offset).
Assuming zero-offset wheels then some careful calculations are needed to determine the interference that results behind the front wheels:
So here is my best shot :
tire diamter D=diameter
tire width W
1) first measure your total diagonal length of tire (this is the distance from the centered pivot point to the far edge of the tread :
d= sqrt((D/2)^2 + W^2)
this tells you the total wheel well space necessary from the center of the hub turning/pivot point. This is the sweep necessary for the tire.
2) now get in car and turn steering so that you turn tire and see how much clearance you have with that present d. Any extra space that you have there tells how much space in the wheel well you have to work with.
So now I need to make a good approximation of the added sweep that additional offset will cause, so
3) now calculate your new effective tire d with the new offset wheel Wn=W+Offset
4) Calculate your new effective tire diagonal
dn= sqrt( (Dn/2)^2 + Wn^2)
now if the extra space from 2) does not exceed the difference dn-d then that offset is not going to work.
This is only a rough approximation. It assumes that the pivot point is inboard at the back of the rim. That is not a bad approximation but it is not perfect either.
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You made me feel like I was sitting in Calc 2 again. Felt like you were going to tell me to integrate it and see if x tire with y backspacing would fit. lol
paul2005tb
Member
If anyone has a 33x11 (285/75/16) on our platform (with 3in suspension lift and 3in body lift) can you please tell me your total net offset and exactly what trimming you had to do to the fender behind the front wheel wells.
I trust my calculations up to a point but I do not want to cut any fender metal.
If the chart is accurate, there would seem to be almost no evidence that a body lift is of any value in increasing tire size.
I trust my calculations up to a point but I do not want to cut any fender metal.
If the chart is accurate, there would seem to be almost no evidence that a body lift is of any value in increasing tire size.
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