My truck is pulling hard to the right on 265/70/16 stt pros

help! My truck is pulling hard to the right on stock suspension and new tires on stock rims. 265/70/16 stt pros. I have alignment pics of what they did when someone replies. Mahalo!

 

Sounds like an alignment issue!

 

Any chance you know stock alignment numbers? L toe .012 R Toe .10
0.35 L camber 0.30 R camber 2.5 caster L 2.2 Caster R
front wheels ^

back wheels toe 0.23 L -0.04 R
CAMBER L 0.00 CAMBER R -0.55

 

Assuming you meant R Caster 2.5, things look pretty close to stock settings. Was it pulling hard right before new tires? Guessing you got an alignment after tire install?

Edit; right rear camber is farther away than I'd like.

 

Two words...Tire Conicity.

 

air pressure, alignment is off.. bad suspension bushings, loose tie rods (inner or outers)...

check the simplest first tire pressures (do not trust TPMS readings, check with a good guage) adjust as necessary (proper pressure is 32PSI)

visually inspect all suspension bushings (upper and lower control arms)

jack up each side.. and let tire hang... check wheel bearing, and ball joints (very little wobble side to side is ok (thats the runout on the steering rack).. up and down there should be none.. feel the inner and outer tie rods.. should be no slop or play other than the slight bit from the rack itself) also check the outer tie rods arent bent (use a straight edge (ruler)).

another fun one that many dont look at is the wheelbase square (measure from front to back both sides, and measure in an X) if the numbers are off from one another your frame is tweeked, or the rear suspension may also be out of whack (bushings, leafs center pin broke(seen this happen), it basically makes the truck do a slight crab walk, and pull to one side...

ALL OF THIS NEEDS TO BE CHECKED.. easy enough with basic tools, measuring tape...

did the truck pull left/right when you first installed the tires? or is this just recent?

 

Thank you all of you for replying. My alignment only pulled to the right 3,500 miles ago when I first got some Cooper stt pros installed on stock rims.
265/70/16. Installed at lex Brodies... it seems ever since I took my truck to them it pulls hard to the right..

 

Here is my alignment picture that lex Brodies gave me..

 

Looked that up.. if I find out these alignment numbers are correct then I'm going to call them out on this.. Maybe I just have one bad tire..

Thank you!

 

Can you tell me if my alignment picture is correct?

 

ill do you one better, I can show you my alignment sheet.... mine tracks perfectly 265/70/17 duratracs on method racing MR 305NV 17x 8.5" 0 ofset

 

Would my alignment be different since I am riding on slightly smaller tires?

Thank you!!

 

Sorry for stealing the thread but since you guys are talking about alignment, Can the sheet be rigged? This is mine from today. Me personally I’ve never seen a perfect sheet like this and I don’t even know if it’s doable to have perfect matching numbers

 

Good add and question. Much appreciated!

 

They will vary slightly, but should be in range. ) main concern is your castor and camber for pulling one way or another.

 

Could of also lost some wheel weights somewhere or the wheels weren't properly balanced

Seems more likely to me than to be an alignment issue considering everything else is stock

 

Right now im leaning towards tire conicity. Looks like I will find out in the morning when I take my rig back to the shop.


Beautiful truck By the way!

 

It appears quite common that the stt pro tires exhibit this right pull. There’s even a poll here somewhere specifically about it.

Considering how you have an oem size tire and that you likely had no pulling issue prior to the tire install it’s highly likely the tires. Sure you could start chasing your tail checking all sorts of suspension components, get several different alignments trying to dial out the pull but at the end of the day there simple solution would appear to be getting another set of tires (possibly off another vehicle to test).

 

Adam - Your caster numbers should be less on the driver's side than the passenger and yours are ever so slightly the reverse. On a non-crowned road that should be fine but on a crowned road this will likely pull to the right but probably not hard right. You have to decide for yourself how much, if at all you want to compensate for crown and then tell the alignment dudes where to set your truck. Most competent alignment techs will automatically go .3-.5 less on the left. But in addition, it's very possible to have a tire that pulls. Have them re-mount the tires flipped (inside to out) and then put what was on the left on the right and vice versa. If it pulls the other way, then you'll know where the problem is.