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Discussion Starter #1
I am lowered on TEIN S-Tech lowering springs with stock 18" rims & tire sizes. Even after an alignment, my previous 2 sets of front tires wore out "prematurely" on the inside edges.
I know that toe is far more important than camber when it comes to inner tire wear, however...

I ordered the SPC Front Ball joints, but am not sure if they'll help my issue. It seems they are more suited for vehicles much lower than mine, which need further camber adjustment.
Opinions?

I'm also now thinking about purchasing the Figs Front LCA Bushings, as they seem necessary in helping guard against premature inner tire wear.
Opinions?

Any other proven solutions for preventing front inner tire wear while on lowering springs, please share.

THANKS, Kyle
 

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Discussion Starter #5
it has been a while since i modified the suspension on any of the cars i have owned, but that doesn't seem like a very drastic drop, i am surprised there are issues with tire wear.
From what I've read (mostly on ClubLexus), It's caused by the fact that the IS (Stock) has aggressive toe settings up front, and is further exaggerated when braking, as the soft front bushings essentially allow the toe to point inward even more.
 

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Discussion Starter #7
Have you ever looked into camber kits?
Yes, bought one, did further research, and then sold it before I ever installed it. (See original post)

Camber has a lot less to do with inner tire wear then most think, it is the TOE that chews up the inner wall MUCH more than camber ever will.
 

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Hi Kyle, have you managed to overcome your problem with the toe settings ?

Im a complete novice at these things and am attempting to lower my Is250 withe Tein S Tech 1.7in F and 1in R on stock 17in rims and am thinking that i may run into the same problems.

Regards

Shu
 

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Discussion Starter #10
Hi Kyle, have you managed to overcome your problem with the toe settings ?

Im a complete novice at these things and am attempting to lower my Is250 withe Tein S Tech 1.7in F and 1in R on stock 17in rims and am thinking that i may run into the same problems.

Regards

Shu
So, I just got new tires 5000 miles ago, and all I've done is been running the tires @ 40lbs each consistently to try and help wearing out the inner walls so quickly. I wont truly know for another 20,000 miles.

That being said, I believe that it has been somewhat proven that the bushings on some type of arms associated with the front suspension are too soft and allow the tires to pitch inward under breaking, which is supposedly the main culprit for inner tire wear on the front tires even with a stock suspension. Look up FIGS bushings, and you should get a better understanding.

I plan to purchase them if/when my tires do the same thing in 20,000miles.
 

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you have it backwards, inner tire wear is front excessive toe out.
Yokohama Tires

I have a fist gen, similar setup i think. In theory as the car gets lower the toe out increases, camber increases and the pivot point of the outer tie rod moves further away from the steering rack. To compensate for the excessive toe out as the suspension reacts to compression, a slight increase of toe in is need during the static setup on a alignment rack. I don't know what they factory spec is, but a wee bit more toe in could help.
I think this condition becomes much more of a factor once the tie rods are past parallel to the ground on a slammed IS.
My car is fairly low on rsr down springs, tie rods are angled up a fair bit. Have experienced some nasty inner tie wear, soft rubber wore out quick.
 

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I have this exact same problem, and also on tein s techs, and with bilsteins.

this makes a bit more sense after reading about the soft front bushings. because I called a better alignment shop, and they told me the #2 caster arm bushing would only allow caster change and should not affect uneven tire wear at all. but maybe he did not know about this soft bushing/braking issue.

hmm.
 

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maybe it's just me, but this seems to be a big/common problem that probably should be sticky'd. And maybe if more people could speak on the real solution, that would be nice.
 
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