https://www.rr-racing.com/Lexus-Lowe...isfxlca001.htm

This is all I need to get to solve this issue? It helps the tires wear better and provides longer life?

(2015 IS 250 AWD)

Does this help with steering response?

 

 

Thanks for that info, what is NVH? And do the RCF/GSF LCA bushings fix the inner tire wear issue as well?
I am trying to understand it being "stiff", will the car be feeling more imperfections on the road essentially? Is the stiffness equal to the stiffness increase in a drop via lowering springs? Sorry, never heard of or done this before

 

 

I have had the RR USRS installed for about 4000 miles (no signs of inner tire wear) and the NVH is not a drastic increase, but a minimal increase. These bushings have a sportier stiffness feeling but nothing where it is unbearable.

I personally love them so far as I enjoy feeling where the tire/wheel is heading.

 

I had the FIG's bushings in my previous IS. Road imperfections, vibrations, bumps and such definitely increased with them, but I didn't find it intolerable. It did make the front end feel much more stable and precise. But I am holding out to see if the GSF/RCF bushing actually cure the inner tire wear this time. I mean, if it doesn't occur on those cars there's no reason it wouldn't solve the problem on the IS. The only reason I would go with those instead of poly bushings is just so I don't have to bother with greasing squeaky bushings every so often. Of course there is a significant price difference as well unless you want to bother with pressing them in.

 

I did the RCF LCA about 5k ago, no front tire wear but my rears are scalloped. I'm going with the SPC camber kit in the rear to straighten up the back wheels to under 1 degree. Hoping this will fix all my tire wear issues front and back, so far the fronts seems good with the RCF bushing. I know the scollping is from toe but I think the rear bushing are soft and the 1.6-2.0 negative camber is only making the problem even more pronounced.
By Saturday my camber setting in the rear will be set at .08 for the rears, fronts are .5-.8 last time I checked. Toe will be +.05 front and +.10 rear. These spec should yield great tire wear and longevity without scratch sacrificing much turn in performance for a daily driver.

 

You have a lowered car right? I wonder if OP has any suspension mods already or not.

 

nope, stock springs and shock.
I drive 20k or more miles a year, I can't go replacing tires every few months. I am going with a 400+ tread rating tie also, I'm ok with giving up a bit of handling for longer tire life.

 

That is strange. I wonder if anyone else on stock suspension is having the rear tire scalloping issue.

 

Wow on stock suspension? Are you RWD or AWD? I have 35k on my rears and no issues so far and I am AWD.

You might want to make sure the the tires are balanced properly. Wouldn't hurt to check your struts or rear strut mount.

 

 

Do the bushings squeak at all? I've read in places that you have to constantly take it apart and grease them or else they will get squeaky.

 

I've had them on for almost 10,000 miles and have not noticed any squeaking. I did apply a liberal amount of grease when I first installed them, but that was 9 months ago. I also installed new tires at the same time, and so far the inner tire wear problem I was seeing on the previous tires appears to have been rectified.

 

I had to grease the RR Racing bushings twice within 1.5 years, but in the last year of running the Figs/Superpro bushings I have not had to re-grease.