Still have inner tire wear even with the USRS!
09-05-17, 03:24 PM
#17
Pole Position
Thread Starter
Inner tire wear is usually from out of spec camber/toe. Even.01 deg can make a difference on the wear.
Also mind you, lexus designed the F to handle better so the OEM specs have more carmber than normal.
If you want absolutely no inner tire wear, get your camber and toe as close to zero but don't expect the car to handle as good from factory.
USRS was designed to help with steering response, not to eliminate inner tire wear
hope that helps
Also mind you, lexus designed the F to handle better so the OEM specs have more carmber than normal.
If you want absolutely no inner tire wear, get your camber and toe as close to zero but don't expect the car to handle as good from factory.
USRS was designed to help with steering response, not to eliminate inner tire wear
hope that helps
I will purchase two new fronts and go ZERO toe to attempt to solve this problem. I also read that toe in also improves high speed stability, is this the case?
The following users liked this post:
Helo58 (09-05-17)
09-05-17, 03:32 PM
#19
Pole Position
Thread Starter
The following users liked this post:
Helo58 (09-06-17)
09-05-17, 07:03 PM
#21
Pole Position
Thread Starter
These fronts were put on at the same time the USRS was put on. They have zero miles without the upgraded bushings.
09-06-17, 06:54 AM
#22
Lexus Test Driver
Also I would add, the wear from your pictures is really not that bad for a heavy sports sedan with an aggressive alignment and suspension geometry with high performance tires.
The following users liked this post:
Helo58 (09-06-17)
09-06-17, 07:51 AM
#23
Pole Position
Thread Starter
The alignment rack should print out values for Cross Camber, Cross Caster, Cross SAI, Total Toe and Cross Turn Diff. These are important measurements of the front suspension that will indicate if the subframe is aligned. I have attached my alignment print out from many years ago when it DID have a poorly aligned subframe (values towards the center of the document). It has since been corrected.
Also I would add, the wear from your pictures is really not that bad for a heavy sports sedan with an aggressive alignment and suspension geometry with high performance tires.
Also I would add, the wear from your pictures is really not that bad for a heavy sports sedan with an aggressive alignment and suspension geometry with high performance tires.
You may be correct with respect to the wear on my tires, but this level of wear isn't vastly different than my pre-USRS levels. It is better, mind you, but when your brain expects resolution of the inner tire issue and the result is that it only makes it slightly better, it stands out and is disappointing. Many people on here report EVEN tire wear across the surface of their tires and I am trying to get to that condition of wear if I can. I'm trying to figure out how to do it now. To be clear, I am not trying to hustle this heavy car around corners with Corvettes or Civic TypeRs so a less aggressive suspension setting suits me just fine. To be truthful, good tire wear and straight-line stability would be ideal for me. My exposure to curves and freeway ramps is limited where I am.
09-06-17, 06:53 PM
#25
Pole Position
Thread Starter
). Prior to the USRS and S-04s, I was running Michelin PSS in stock sizes. They wore down to cord showing on the inner edge. I had hoped with the USRS to run 1 set of fronts to two sets of rears, but with inner edge wear on the fronts, it doesn't look like that will be possible.
09-06-17, 07:31 PM
#26
Even with lots of negative camber you can minimize wear by increasing toe in beyond spec and in some cases increase tire pressure ever so slightly.
A competent tech if told the real story and you point and say, this is the wear at 5000mi, what can we do? I maintained the pressure at xx.x and drive mostly freeway miles, what do you see?
Cars that do the errands and grocery shopping will scrub the edges a lot. Increase tire pressure a small amount.
I'm saying, watch them close and adjust as needed for how they are used.
My old car had -1.75 and -2.25 rear camber. I string align it in the drive maintaining equal turns to keep the rear thrust angle and front steering wheel centered. We are talking small adjustment here and this is not for everyone but a good tech can mitigate wear. Share the woke story and go back to the same guy, same equipment. Their OLD as left values should come up as your current As Found values. From here minor adjustments can help you...
Good luck and keep us posted. Post the values as left and the best tire pictures you can.
A competent tech if told the real story and you point and say, this is the wear at 5000mi, what can we do? I maintained the pressure at xx.x and drive mostly freeway miles, what do you see?
Cars that do the errands and grocery shopping will scrub the edges a lot. Increase tire pressure a small amount.
I'm saying, watch them close and adjust as needed for how they are used.
My old car had -1.75 and -2.25 rear camber. I string align it in the drive maintaining equal turns to keep the rear thrust angle and front steering wheel centered. We are talking small adjustment here and this is not for everyone but a good tech can mitigate wear. Share the woke story and go back to the same guy, same equipment. Their OLD as left values should come up as your current As Found values. From here minor adjustments can help you...
Good luck and keep us posted. Post the values as left and the best tire pictures you can.
The following users liked this post:
Helo58 (09-06-17)
09-06-17, 07:53 PM
#27
Pole Position
Thread Starter
Even with lots of negative camber you can minimize wear by increasing toe in beyond spec and in some cases increase tire pressure ever so slightly.
A competent tech if told the real story and you point and say, this is the wear at 5000mi, what can we do? I maintained the pressure at xx.x and drive mostly freeway miles, what do you see?
Cars that do the errands and grocery shopping will scrub the edges a lot. Increase tire pressure a small amount.
I'm saying, watch them close and adjust as needed for how they are used.
My old car had -1.75 and -2.25 rear camber. I string align it in the drive maintaining equal turns to keep the rear thrust angle and front steering wheel centered. We are talking small adjustment here and this is not for everyone but a good tech can mitigate wear. Share the woke story and go back to the same guy, same equipment. Their OLD as left values should come up as your current As Found values. From here minor adjustments can help you...
Good luck and keep us posted. Post the values as left and the best tire pictures you can.
A competent tech if told the real story and you point and say, this is the wear at 5000mi, what can we do? I maintained the pressure at xx.x and drive mostly freeway miles, what do you see?
Cars that do the errands and grocery shopping will scrub the edges a lot. Increase tire pressure a small amount.
I'm saying, watch them close and adjust as needed for how they are used.
My old car had -1.75 and -2.25 rear camber. I string align it in the drive maintaining equal turns to keep the rear thrust angle and front steering wheel centered. We are talking small adjustment here and this is not for everyone but a good tech can mitigate wear. Share the woke story and go back to the same guy, same equipment. Their OLD as left values should come up as your current As Found values. From here minor adjustments can help you...
Good luck and keep us posted. Post the values as left and the best tire pictures you can.
I am scheduled to get new front "shoes" this Friday. So, the plan is to start with 37 psi (cold) in the front with zero toe. I don't anticipate any other changes during the installation.
09-06-17, 09:11 PM
#28
I have the USRS have have never had this issue. When I sold my stock wheels and tires, S-04, 245/35 in front wear was quite even as I recall. I just went out and check my current RCF wheels with S-04, 255/35 and both sides, inner and outer measured 8/32".
Lou
Lou
The following users liked this post:
Helo58 (09-06-17)
09-06-17, 09:20 PM
#29
Pole Position
Thread Starter
In the end, I would love to prevent this wear if possible. For those who have "normal" and even wear, I would love to know the secret. Big scheme of things though, replacing two fronts every 12k-15k isn't the end of the world. Thanks for all of the help everyone!
