what is the biggest sized tires I can put on a stock 03, and have enough clearance in the wheel wells? 285's? 305's?

what about a 6" lift? what can I run without modifying the wheel wells?

thanks

There are a few guys on the board running a 315/75/16 without lifts.

It somewhat depends on the geometry of the wheels you choose. Stock wheels should only be fitted with 265s and no bigger.

Without a lift running 285s or bigger on 8" wheels or wider- you may also have to do some t-bar cranking, green keying, wheel well/air dam trimming-or-tieing back.

I am running 33" BFG's without a lift!

Running 285's on stock wheels, 4 cranks on the bars, trimmed the corners of the air dam and got it aligned and runs real nice. I question those that say 285 on stock wheel is not a good idea. Reputable tire suppliers (2) have both agreed it is ok. What am I missing?

instead of cranking up the stock torsion bars, I purchased after market torsion keys from suspensionmaxx.com in michigan that are designed to be cranked up. they work great!

It is printed (molded) right on my Goodyears "Do not install on 6.5" wheels".

America's Tire won't install any 285 on a 6.5" rim. BigO wont either.

There apparantly were some studies resulting in safety issues with 285s on 6.5s.

GM reen keys for less than 17 bucks each. These do the same as cranking the t-bars except it does it by clocking the keys instead of cranking the bolts.

Tension on the t-bars raises the truck's neutral front suspension pos.

365/65-16's on mine. A little trimming.....

[quote=

There apparantly were some studies resulting in safety issues with 285s on 6.5s.[/quote]


Ide be interested in reading about that. Of course there have also been studies about trucks lifted high enough you can change the oil without jacking it up but that's another story...

Ide be interested in reading about that. Of course there have also been studies about trucks lifted high enough you can change the oil without jacking it up but that's another story...

305's (33") are the biggest I've been able to fit. I tried a set of 315's but they rubbed in the front. My 33's are mounted on my stock wheels....why would it be a problem. I went through another set of 33's on my '03 and they were great, got 40'000 out of them....

America's Tire won't install any 285 on a 6.5" rim.
Mine did.

I went back a week later and bought a set of 16x8 Bajas.
Ide be interested in reading about that. Of course there have also been studies about trucks lifted high enough you can change the oil without jacking it up but that's another story...
Umm... I can do that with my '06... 4x4, riding on 285's, couple of cranks on the bars got all of the fender lips at 41".

Ive got 315's no lift. Minor trimming

285/75/16s have a 7.5"-9.0" rim/wheel width range from every manafacturer I could find. The stockers at 6.5" are well below the minimum spec.

I saw the policy letter at America's tire telling the techs not to install these tires on stock rims. Sure some techs will do it and I know they will go on and for most, they work fine. I have run them myself for 50K miles with no issues except a bit of extra wear in the center of the patch. After checking out how out of spec they were and seeing official policies and even seeing the warnings molded into the sidewalls of my new tires - I decided to upgrade my rims or downsize my tires. Chose to get new rims and they are sweet!

h2 wheels and 315/70/17 bfg at's.........minor trimming and raise the front a little still have plenty of adjustment left
no rubbing

Here is a pic of the 365's. no lift no crank.

http://www.dieselplace.com/forum/attachment.php?attachmentid=7284&d=1123464183

WOW - those are fat tires. What rim size and sidewall ratio?

Here is a pic of the 365's. no lift no crank.
Somehow, I think "A little trimming" was an understatement.


So... how many sawzall blades did you go through? :D

Back tires fit without trimming. Front required about 1-3/4" trim off the back of the fender plus some hammer work on the cab corner.

Rims are 10x16 Welds. Tires are 365/65-16 Nittos.

If you start reading all the warnings that are on products its amazing that we get anything done. It says right on the tire that if you put air into this product it may explode if done incorrectly. My quad had so many warning labels on it when I bought it I couldn't tell what color it was... :offtopic: sorry....

Haha, I was thinking the same thing. The same goes for the studies done on tires. There are studies done on just about everything and there are results that favor both sides. Depends on who's doing the studies.

i have 285's on my truck and have had not one problem with them..!
robert

Fingers, what are you using for a air dam? Do you have any other angles?

That is a custom laser cut dam made from 3/8 conveyor belt.

Angles?

WOW - those are fat tires.
You should see them doing the doe-see-doe on the front end while launching in 4WD at the drag strip :ro) :muahaha: :cool2:

Yea, had a little to much boost that time. No front locker. So as each tire spun and grabbed the truck would rock back and forth. I have video.

What the Tire Installers are saying about not putting 285's on 6'5" wide rims isnt just made up. 285's are out of spec on our stock rims, they are just following manufacturers directions and industry standards. Yes you can put them on the rims, many many people do. I sell rubber and do not recommend they be put on 6.5" rims because they are out of spec, plain and simple. Back on topic I've had 35x12.50x17 XTerrains on H2 rims on my truck, no lift. 35" tall is about it without a lift, otherwise you'd have to start cutting metal to not rub.

That is a custom laser cut dam made from 3/8 conveyor belt.

Angles?
I like it! Do you have any other pictures of your truck? I never seen such fat tires on a non lifted Duramax.

I like it! Do you have any other pictures of your truck? I never seen such fat tires on a non lifted Duramax.

You've also not seen another Dmax where a "little" trimming involved a BFH...

This is how much was trimmed from the back of the wheel well

http://www.dieselplace.com/forum/attachment.php?attachmentid=2252&d=1108748022


And this how much the front bumper and valance was clipped.

http://www.dieselplace.com/forum/attachment.php?attachmentid=2253&d=1108748022

And this is what it looks like with the custom flares on

http://www.dieselplace.com/forum/attachment.php?attachmentid=6390&d=1121307996

WOW! That is a custom truck!:D How does it ride with those big meats?

:confused: What width are the H2 wheels that are being put on these trucks? Are there any clearance issues with these? Thanks.

That's about how much I cut/hammered mine. I didn't go quite so far up though. I just cut the flare on the curve and pushed it back too. I have thought about getting some bushwacker cutout flares, but it works the way it is and nobody even notices where I cut the flare.
I'll try and take a picture and post it...

http://i6.photobucket.com/albums/y210/TwoTone98Z71/Silage%20Harvest/P9120063.jpg

35s

Running 285's on stock wheels, 4 cranks on the bars, trimmed the corners of the air dam and got it aligned and runs real nice. I question those that say 285 on stock wheel is not a good idea. Reputable tire suppliers (2) have both agreed it is ok. What am I missing?

285's should be on a an 8 inch wide rim for stability. Mounting them on 6.5 inch rims makes for a less stable side wall. I"m talking about wobble and side wall deflection. Idealy you would want the two beads of the tire to be separated by a distance that is equal to the width of the tread. This ideal situation is a far cry from mounting 285's on a 6.5 inch width rim. NOW, that having been said, I would say it is perfectly safe as long as you are now towing heavy, or loaded heavy. Both are situations that would exaggerate sidewall deflection.

I've seen 40's on a stock mid 80's K10, course there was a lot of sawzall work done.
Was a poor boy hunting buggy, driven everyday

I would think the contact patch with 315's or even 285's on a 6.5 rim would be less than a 265. Just because the tire is "fat" doesn't mean it's actually making more contact.

You would think that, but the sidewall flexs enough to put quite a bit on the ground. The entire tread area on the 285s and on twotone's 315s is nearly flat on the ground. Almost as flat as my 315s on 10 inch wheels. Surprising, but true.

here is mine all stock with 315x75x17s off a hummer, powdercoated black. suspention is all stock with the tb's cranked almost all the way up.(within a thread)

http://www.1320video.com/gallery/d/28707-2/DSC09350.jpg

What are these reen keys LTChip mentioned about?
Thanks in advance:help:
Dan

Reindexed torsion rod adjusters. If you can't get enough lift by cranking your torsion rods, then green keys (about $20 each at the dealer) will allow you to get more lift.

However... if your angles get too severe (more than 1 or 2" lift) you'll dramatically increase wear on your balljoints, steering components, and CV joints.

The "proper" way to lift is with a spindle or control arm lift that also lowers the front differential to help maintain proper geometry, but be careful there, because even some 6" lifts only drop the diff 4.5" or so.

dieselduner. how are you running 33" on stock 05.

33's are easy; just crank the t-bars 5 turns or so...I beleive Fingers has 35's on his 2004 LLY.

--Ben

Ahh... Fingers has something like 38's or so... I think 365's.
Maybe not lifted, but he's burned through a few SawzAll blades :D

Fingers tires are 365-65-16s, they are 35 tall but around 14.5 wide...

365 = width in mm

His stick out way farther than my 315s, and we both run 16x10 wheels. Backspacing is close I think.

4.5" backspacing. I keep looking for 5", I seem to have the room in that direction. Tires are 35" tall and about 14.5" wide at the sidewalls. The treads are about 12.5" wide. The height was not a problem but the width created some clearance issues.

Only one SawsAll blade, and a small selection of hammers. ;)

Will the stock H2 set (315's and chrome rims) fit on a 2005 2500HD 4X4 with the torsion bars cranked? I realize some trimming will have to be completed on the front air dam, however will the rears fit without trimming or rubbing?

Thanks,


:D

Rears will be fine

so i should be fine with 285 bfg all terrains and mickey thompson 16x10 classic twos on the stock lift with some air dam triming and a couple cranks of the t bars.

16x10 might be pushing it a bit.... it'll be close, and 4.5" backspacing may not be enough with the 10's.
Given the same backspacing, they'll stick out 2" more than mine, which would be like a 16x8 with only 2.5" of backspacing.... definite problems there.


I would not plan for this through online purchases.... do it as a shop AND make sure they let you drive some figure-8's in the parking lot.
The tires will be fine, I'm just concerned about the wheels.

I have a question as well, I have a 2006 2500hd crew cab duramax. I am in the process of ordering 18"x9" wheels. I currrently have 285's on it, and no rubbing, but my question is, What tires/size should I put on my wheels? I do a lot of towing, not sure if that would make a difference. Also, do you recommend that I get the torison bar keys and 1" rear blocks as well?

If you have a 4x4, I would stay clear of a lift based on cranking the keys.
If you're thinking about 1" lift for the rear, then that would be a total of about 3-4" for the front to make it level.

At that point, you'd be better off (but a lot lighter in the wallet) to buy a 6" lift and de-crank the TB's to bring it back down to 4". This works out well with some lifts... I think Fabtech only drops the front diff 4.5", so de-cranking would give you better angles than stock.

If you try to go more than 2-3" using just the TB's, either with stock keys or green keys, you are going to get into seriously accelerated ball joint and tie rod wear, as well as problems with the CV's on a 4x4.
It'll also ride like crap because your UCA's are going to be resting on the snubbers and the shocks will be fully extended. On a 2wd, you don't need to worry about the CV's, but all of the other problems are present, though a proper lift would be cheaper.

For your rubber, a 315/60-18 would be about the same diameter as your 285/75-16's, so it would not change your speedometer error, but, as indicated above, the 9" rim width is going to be a problem. Maybe... if you can get the rims with a 5" or 5.25" backspacing you'll be okay, but I don't know if that'll put the inside of the wheel too close to the frame or UCA's.

Reread the last page... Nar is running 16x10's and he cut his fenders.

http://img359.imageshack.us/img359/3196/wheels6em.jpg

35s on 16x8s with 4.5 bs

the wheels say don't mount tire on 16.5" rim

the wheels say don't mount tire on 16.5" rim
Of course not.
16" tires go on a 16" rim, 17, 18, etc....
16.5 is a bit of an oddball these days, but still around.

305-55-r20 On Mine

http://img475.imageshack.us/img475/4158/pc2000216oh.jpg
http://img361.imageshack.us/img361/3396/pc2000166ua.jpg
http://img361.imageshack.us/img361/8089/pc2000119xb.jpg

Big Brand wont put anything bigger than 265's on the stock rims, at least the one I frequent will not.

I know most tech data sheets for tires have a max/min rim size.

I am running 285 70 17's with H2's. Trimmed the air damn took about 2" off of the front of the inner wheel wells and wire tied the the brake cable, but did not touch the T bars. If I were you I would try that first. I just did not want to change the ride of my truck and I did not want it to be level.

can you put 31x10.5016 on the stock wheel.:grd:

just put 33x13.50 r17 on my h2's.. NO LIFT, very slight trimming of air dam, and few torsion bar turns... 4 at the most.. and no problemas

can you put 31x10.5016 on the stock wheel.:grd:
Stock tire is 30.5" x 9.6",
265/75-16 is a 31.6" x 10.4"
285/75-16 that really shouldn't be on a stocker is a 32.8" x 11.2"

I'd say, yes, the 31 should pose no problems.

315's pics in sig

I just had some 33x12.5x18's put on my truck and they fit perfect. No lift, just turned up the torsions a few cranks and trimmed the bumper trim and the fender apron a little bit. (oh and the wheels are 18x9's w/ 4.5" of backspacing)
http://i20.photobucket.com/albums/b213/dumontduneriders/4.jpg
http://i20.photobucket.com/albums/b213/dumontduneriders/3.jpg
http://i20.photobucket.com/albums/b213/dumontduneriders/2.jpg
http://i20.photobucket.com/albums/b213/dumontduneriders/1.jpg

Hey dunefreak are those tires noisy? They look great but I drive my truck a lot and dont want a bunch of tire noise. Perfect size! Also what wheels are those?

Hey dunefreak are those tires noisy? They look great but I drive my truck a lot and dont want a bunch of tire noise. Perfect size! Also what wheels are those?

They are a little noisey, well, compared to the stock ones that is. I have heard they are some of the quietest M/T tires out there though. I know the A/T's in the Toyo are much quieter, but they don't give an aggressive look. I would suggest driving a truck w/ them before you buy them. That is what I did. I don't think they are that noisey though. It depends how picky you are. If you have the radio on, you can barely hear them. I'd go with them if I were you, I like em. :D
The wheels are Centerline/ Wilderness Series/ Flint's.

i still love my 305 bfg m/t's...

http://www.ureside.com/ffej/2500HD/560A0140.JPG


http://www.ureside.com/ffej/2500HD/560A0145.JPG

hey ureside is that the stock height or did you lift it any. and dunefreak what kind of tiresare those.:grd:

hey ureside is that the stock height or did you lift it any. and dunefreak what kind of tiresare those.

Toyo Open Country M/T's 33x12.5x18's & E rated too! :D

yeah i think i want 315's baja claw radials on my truck... only time will tell now with money and all.
robert

Toyo Open Country M/T's 33x12.5x18's & E rated too! :D

thanks.:grd:

I Have 2005 Crew With 305, Bfgs, Bars Up And Aligined. Sweet No Problems. Smooth Ride. Waiting On Bilston Shocks For Improved Ride. He He.

Do some recearch on the tire manufactures web sites they give you exact sizes of each tire and what size rim to use some will let you mount their 285 on stock rims some wont .ive had 285's on my stock wheels and had no problems they were Master Craft Coursures now im running yokahama geos at+II' (great tire ) and have had no problems ,when you check the tires exact diementions on the web sites you will find that he tire measurments will vary from manufactures some by as much as an inch

http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280017.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280019.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280020.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280023.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280030.jpg

Yep Im Running 285's On A 06 Lbz No Cranks Of T Bars No Trimmen No Ruben

My 03 2WD 6.0

Fabtech 3" spindles

16x8 M/T Classics

285/75x16 Bridgerocks


The Fabtech spindles have a nice 2 inch wider stance.

Truck sits nice and level without the old a$$ high look.

Super nice ride, much better than cranked T-bars.

http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280017.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280019.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280020.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280023.jpg
http://i6.photobucket.com/albums/y210/TwoTone98Z71/New%20Rims%20On%20the%20Duramax/PC280030.jpg
how much did those rims set you back?
robert

how much did those rims set you back?
robert

450 shipped with lugs, caps and chrome valve stems off of ebay from tomzwheels:ro)

Where did you get those flares?

Here is a pic of the 365's. no lift no crank.

http://www.dieselplace.com/forum/attachment.php?attachmentid=7284&d=1123464183

I have 285,s rides better,handles better,little less mileage. but looks whole lot better!!!

Where did you get those flares?

Rears are Bushwacker cut outs and the fronts I made myself.

Where did you get those flares?

the back ones are bushwacker I believe and he made the front ones:cool: