2006 GS430 inside edge tire wear
#16
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OK guys, it appears that there is a great possibility that the lower caster arm bushings are the culprit.
This bushing is a very well known point of failure in the 2GS and was even upgraded by Lexus twice in that generation, each time they made the bushing more stout.
I have found that ROCA makes a lower caster arm bushing for the 2006 - up GS and can only think that the problem must be this bushing - so under braking the front wheels will toe out badly and cause the inside edge to wear badly - I mean why the heck else would an aftermarket company sell these?
http://www.roca-usa.com/product.php?...roducts_id=113
Really it seems as if it can be the only answer as everything else is good (shocks, balljoints etc.)
For now I have added toe in to my alignment, the tires are actually very slightly scrubbing on the outside - but the wear inside has been slowed down.
I am going to order those ROCA bushings because they are cheap and look like an easy job - I will report back.
This bushing is a very well known point of failure in the 2GS and was even upgraded by Lexus twice in that generation, each time they made the bushing more stout.
I have found that ROCA makes a lower caster arm bushing for the 2006 - up GS and can only think that the problem must be this bushing - so under braking the front wheels will toe out badly and cause the inside edge to wear badly - I mean why the heck else would an aftermarket company sell these?
http://www.roca-usa.com/product.php?...roducts_id=113
Really it seems as if it can be the only answer as everything else is good (shocks, balljoints etc.)
For now I have added toe in to my alignment, the tires are actually very slightly scrubbing on the outside - but the wear inside has been slowed down.
I am going to order those ROCA bushings because they are cheap and look like an easy job - I will report back.
#17
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I've been aligning cars since 1992 and I have used many different racks, also used string, chalk, measuring tapes and just by "eye" and I have not encountered a problem like this without a solution - that means something is definitely wrong and I think it must be these bushings.
I set up cars sometimes just by eyeing the toe and then correcting it a little so the car will track straight and have had excellent results (no, I'm not suggesting everyone try this, unless you have 20+ years experience doing it) but what I mean is that cars have to be out of spec big time to have the tire wear like we are seeing here - the fact that the suspension "looks" in-spec when sitting still (i.e. on an alignment rack) tells me that something is moving a great deal when the car is actually in operation.
#19
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I have 06 GS 300 with 59K on it and its wearing the inside of the front tires. Didn't show up when they did the last oil change 6K miles ago.
#20
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well, so far for me the FIGS front LCA's have really eliminated my slight pulling to the left and so far my front tires aren't seeing significant wear as before without them. i only have had the LCA's in since about summer but so far i would say a must needed buy for those with over 50k on there chassis.
Last edited by PhantomV; 12-08-14 at 05:42 AM.
#21
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Hey folks, I have been reading that this is a common issue in these cars and that some dealers are telling people that it is normal.
This cannot be normal, has anyone found a definitive answer to why it happens?
I put a set of michelin PSS on less than 2 months ago and already have the wear happening, I have aligned the car 2X since and it is still an issue (I even added toe-in to try and compensate, I may try more)
This cannot be normal, has anyone found a definitive answer to why it happens?
I put a set of michelin PSS on less than 2 months ago and already have the wear happening, I have aligned the car 2X since and it is still an issue (I even added toe-in to try and compensate, I may try more)
#22
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As an update, I installed new caster arm bushings last year and the problem is gone - my new tires (less than 5K) were worn to about 2/32" at the very inside edge when I changed the bushings and have not worn any more since.
Also, the shudder when reversing is almost completely gone - I don't think I mentioned this but it was surely due to the bushings.
DON'T LET anyone tell you it is normal - tires wearing like that is unacceptable on any car.
Also, the shudder when reversing is almost completely gone - I don't think I mentioned this but it was surely due to the bushings.
DON'T LET anyone tell you it is normal - tires wearing like that is unacceptable on any car.
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