37 width...

[Freed127]

Hey guys. Im looking to make the jump up to 37s sometime this fall. I saw too many set up this way at the Mopar nationals in carlisle.

So im running into some issues with width. I wanted to stay with 18s like im currently running but i see that most 37s on 18s are a 13.50 wide. How do these trucks handle the added width? I know bigger tires always add stress and that rotating weight greatly effects vehicle performance. So what are most guys here running? I was hoping to keep a set of 37s under the truck for the most part like my 35s are, maybe thats just being unrealistic tho haha.

Worst case ill be scrapping this idea and buying a set of longtube headers lmao

 

[kg93]

well what type of tires are you looking for? 37 12.50 r18 | eBay

 

[Freed127]

Yup, a 37 12.50 18 M/T seems like there is only the trail grappler, federal and pro comp mt2s in this size. So its not so much that there arent available, just not what i wanted really. Im like the new stt pros and can get a deal locally on them

 

[kg93]

gotcha. I mean you can 13.5s most likely. Just look at the space between the tire and the knuckle. Worse comes to worse you'll just need some spacers

 

[Freed127]

Anyone have an idea on what id need wheel wise to clear 13.50s if i choose to go that way? Zone says 5" backspace on a 9 wide for 12.50s. So id assume a 5" backspace 10 wide would clear 13.50s?

Anyone with first hand experience running the wider rubbers?

 

[AustinB]

Maybe its just too early, and I'm way off here....

But 5" bsm on a 9" wide wheel, vs 5" bsm on a 26" wide wheel...is still 5"bsm. So I dont think the width makes a difference as far as your tire clearing the knuckle.

I would shoot for something like 4.5" or 4"

12.50 wide tire to 13.50 only adds 1/2" on the inside. So you just need to minus .50" from the wheel that would work with 12.50" tire. Just read that over and over a few times, youll get it.

 

[Freed127]

Maybe its just too early, and I'm way off here....

But 5" bsm on a 9" wide wheel, vs 5" bsm on a 26" wide wheel...is still 5"bsm. So I dont think the width makes a difference as far as your tire clearing the knuckle.

I would shoot for something like 4.5" or 4"

My thought was the extra inch of wheel on the outside would take care of the extra inch of tire width?? Again i could be wrong too

 

[AustinB]

My thought was the extra inch of wheel on the outside would take care of the extra inch of tire width?? Again i could be wrong too

Its an extra 1/2"

 

[AustinB]

Bare with me..

 

[AustinB]

Less bsm pushes the wheel further out, adding more room for a wider tire. (Same as negative offset) ..

So if a 5" bsm wheel clears the knuckle with a 12.5" tire... and you go up to a 13.5" wide tire...that add 1/2" of tire to each side of the wheel.

So you need to push the wheel out 1/2"

5" bsm - 1/2 = 4.50" bsm. (Or a 1/2" spacer)

 

[Freed127]

I understand what your saying. But maybe i look at it different. A 12.50 on a 9 wide vs a 13.50 on a 10. The tire "should" hang off the wheel the same about on either setup because the tire centers on the wheel. With both being 5" bs it shouldnt be any closer to the knuckle

 

[AustinB]

Clearing the rim/clearing the tire, same thing.

A wider rim doesn't make the tire more narrow.

 

[Freed127]

Yes it wont make it narrower. But the extra wheel width on the outside should keep me the same off the knuckle.

12.50 on a 9 wide, 12.5-9= 3.5 so 1.75 off on each side.

13.50 on 10 wide, 13.5-10= 3.5 so 1.75 off each side,

Both have 5 bs so no closer to the knuckle

 

[Dmopar74]

No.

A 13.5 will add 1/2" on the backside by the knuckle over a 12.5

 

[Freed127]

Im failing to see the extra 1/2" on the inside when the additional inch of wheel on the outboard side makes up for the added width. Its in the math.

 

[Dmopar74]

Wheel width does not affect tire width or placement. When both a 10" and 9" or any width rim has the same 5" backspacing and you add a wider tire, that tire will stick out the same amount on both sides of the rim.

Say a 12.5 tire on a 8" rim, that gives 4.5" total extra width, that gives 2.25" on both sides of the rim.

A 13.5 tire on same rim would give you 2.75" on both sides of the rim

12.5 on 9 would give you 1.75" on both sides of rim
13.5 on 9 would be 2.25" on both side of rim

12.5 on 10 is 1.25" on both sides of rim
13.5 on 10 is 1.75" on both sides of rim

 

[Dmopar74]

Wait, I think your right. Reading my own post after yours and we're saying the same thing

 

[AustinB]

Wait, I think your right. Reading my own post after yours and we're saying the same thing

Lol.. it doesn't change anything.

Dont worry about the rim. Its the tire.

A 12.50" wide tire barely fits with 5" backspacing. You can go from an 8" wide rim to a 12"wide rim.. with 5" bsm, the tire is the same distance from the knuckle. The only way to move the *tire* further from the knuckle is to have *less* backspacing.