Alignment with SPC UCA

I should definitely be on at least a 10 inch rim, that’s next But typically it rides just fine but I do eat through tires in 30k miles.

 

those tires are gonna die fast on tarmac but you know that. depending on your alignment and some related to pressures, the narrower wheel may allow over compliance with the tires and that can exaggerate wear on an uneven alignment. I'm interested to see if just running them another 100+miles on the highway reduces the pull.

 

I’ll check pressures and give it a good drive tomorrow

 

Does the pull get worse when you hit a bump?

 

What psi?

 

Bump steer got a little worse

 

34.5 all the way around

 

just make sure you verify that tomorrow. i doubt that's the issue but you don't need more variables.

 

Late to the party. Catching up. A couple things.

Caster is the only alignment variable that does NOT cause tire wear. It’s SAI. Steering axis inclination. Think of it as front to back position. Vehicles always pull toward greater camber and less caster.

Bingo.
Greater caster will hold the vehicle on center line better. And it won’t munch rubber.

 

Positive caster is back to front.
Positive SAI is inward to outward.
SAI has a similar effect on stability as caster. Higher SAI is often spec'd to avoid the pitfalls of high caster; specifically, tire lean and camber changes during turning, which can cause shoulder wear.

 

If I ride it for a couple 100 miles and it still persists should I have them change anything?

 

I think your biggest problem is the addition 15mm of negative scrub radius with the taller tire.
Alignment is a static measurement. Positive scrub will toe out when driven. Negative scrub will toe in when driven.

If you hit a bump on the right only, does it shoot to the right?
Did you have a lot of outer shoulder wear?
If so, I'd go slightly toe out on your alignment.

You can 'fix' the negative scrub with a 3/4" spacer or the appropriate offset/wheel width.

 

Also, 35 psi is a bit much for that tire.
At 35 psi, those tires have a load capacity of 2,535 lbs. You only 'need' enough psi to obtain 1,954 lbs. LT inflation charts do not go below 35 psi, and is generally not recommended to go below that. If one were to calculate based on the value of 1 psi, from 35-40 psi, it would be 26 psi. That said, I'd experiment from 25-30 psi.

Then again, with such a wide tire on a narrow rim you might 'need' the higher psi to offset sidewall compliance.

 

Do you think spacers would help reduce tire wear?

 

Depends on your answers...
.
If you hit a bump on the right only, does it shoot to the right?
Did you have a lot of outer shoulder wear?

You might need more than 3/4", since your SAI increased.
There is some overlap with your cross SAI number(unequal) and negative scrub. Either way, in bump, it's creating a difference in moment arms through the tread, laterally.

 

Told ya @splitbolt would have some beta for ya

 

I drove it more tonight still pulling but it’s more bearable. Bump steer was about the same didn’t really matter if I only hit right or left.

And yes on my Goodyear duratracs I had lots of shoulder wear

 

Thank you

 

Spacers or new wheels are a good idea regardless. Negative scrub on rwd is not an ideal situation. I mentioned a 3/4" spacer previously, before I accounted for increase SAI. You could probably do up to 1.25" without increasing positive scrub significantly.

 

Another thing....
Your cross SAI is creating more negative scrub on the driver side; it's being toed in more when driven.