Tire Size

monteballz · January 30, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

hotbread597 · January 31, 2009

Is it a classic body style or the new new body style?

Swang · January 31, 2009

Not sure...I've cleared 285s without rubbing but we cranked the torsion bars a little bit. It's close so I'm going to say probably not.

2000DV4.8 · January 31, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

The leveling kit does the EXACT same thing to your front suspension as cranking the torsion bars 2" would, just so you know.

Swang · January 31, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

The leveling kit does the EXACT same thing to your front suspension as cranking the torsion bars 2" would, just so you know.

I didn't think this was true. If it's new keys it will raise the front end without changing the alignment of the torsion bars so that way the ride still feels stock, and not rougher like it is with the bars cranked. Maybe I'm wrong but that's what I thought.

MarkD · January 31, 2009

It depends on if you have torsion bars.

VMax2007 · January 31, 2009

It depends on if you have torsion bars.

He does.

ursandal · January 31, 2009

If it's the NNBS (07 & up) you will rub with 285's. I have 265's and rub at full lock with compression. On level ground it doesn't rub.

2000DV4.8 · January 31, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

The leveling kit does the EXACT same thing to your front suspension as cranking the torsion bars 2" would, just so you know.

I didn't think this was true. If it's new keys it will raise the front end without changing the alignment of the torsion bars so that way the ride still feels stock, and not rougher like it is with the bars cranked. Maybe I'm wrong but that's what I thought.

That's exactly what the keys do though, is 'change the angle' of the torsion bar. That is the only way to achieve any 'lift' out of the torsion bars.

The only difference between OEM keys, and aftermarket keys, is the index. With the adjustment bolt in the same position, the re-indexed key will have the torsion bar twisted a certain amount. Think of it like a wrench on a bolt. No matter at which angle you put the wrench on at, twisting it 45 degrees is still 45 degrees.

Sierra250004 · February 1, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

The leveling kit does the EXACT same thing to your front suspension as cranking the torsion bars 2" would, just so you know.

I didn't think this was true. If it's new keys it will raise the front end without changing the alignment of the torsion bars so that way the ride still feels stock, and not rougher like it is with the bars cranked. Maybe I'm wrong but that's what I thought.

That's exactly what the keys do though, is 'change the angle' of the torsion bar. That is the only way to achieve any 'lift' out of the torsion bars.

The only difference between OEM keys, and aftermarket keys, is the index. With the adjustment bolt in the same position, the re-indexed key will have the torsion bar twisted a certain amount. Think of it like a wrench on a bolt. No matter at which angle you put the wrench on at, twisting it 45 degrees is still 45 degrees.

Wow.. i think u argue more about torsion keys than anything else hahaha

2000DV4.8 · February 1, 2009

I've got a 07' GMC Sierra 2500HD (New Style) and i'm sick of the stock 245's. I'm going to get some BFG All terrain TA's and i'm wondering if I can run 285's without any rubbing issues in the front? I dont want to crank the T-Bar's. Can I run the 285's? what's the largest size tire we can run without rubbing when turning?

I guess i'd go for the 2'' leveling kit in the front if i absolutely had to. but i'd rather not.

The leveling kit does the EXACT same thing to your front suspension as cranking the torsion bars 2" would, just so you know.

I didn't think this was true. If it's new keys it will raise the front end without changing the alignment of the torsion bars so that way the ride still feels stock, and not rougher like it is with the bars cranked. Maybe I'm wrong but that's what I thought.

That's exactly what the keys do though, is 'change the angle' of the torsion bar. That is the only way to achieve any 'lift' out of the torsion bars.

The only difference between OEM keys, and aftermarket keys, is the index. With the adjustment bolt in the same position, the re-indexed key will have the torsion bar twisted a certain amount. Think of it like a wrench on a bolt. No matter at which angle you put the wrench on at, twisting it 45 degrees is still 45 degrees.

Wow.. i think u argue more about torsion keys than anything else hahaha

Because there are so many misconceptions about torsion bar suspensions. And suspension stuff is what I know the most about.

BuckFeverZ · February 1, 2009

I almost guarantee you will rub with 285's. My buddy has an '08 2500HD and he tried putting 285's on and they still rub even with the t-bars cranked.

monteballz · February 5, 2009

I almost guarantee you will rub with 285's. My buddy has an '08 2500HD and he tried putting 285's on and they still rub even with the t-bars cranked.

So whats the perfect size to run with the t-bars cranked?

Phazer_II · February 5, 2009

My '08 Sierra 2500HD came stock with 265/70/17's, and when I looked this morning it appeared the closest point of the tire is the moulded splash guard...when I broke the frozen snow off, the thinnest part was still about an inch and a half thick.

rgaspa77 · August 20, 2012

To all you guys arguing about the torsion keys... Here is the ansewer ...The stock height and keys put a certain amonut of load on the torsion bars and that loads controls the firmess of the ride...raising the truck with the stock keys will male the ride firmer....the indexed keys will raise the truck without putting more torque on the torsion bars. This gives you the height without giving up the ride....FYI Pickle does not know his ass from a hole in the ground.

Also any body running 275/65/20 on the leveled truck with stock rims.