60mph vibrations usually occur when the wheels are not balanced or not balanced properly or when you switched your suspension system you should always have a 4-wheel alignment. Riding as slammed and as aggressive as I am, I haven't yet felt any vibrations of any sort on the highway.

 

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i got 255 upfront and having no problems at all.. of cousre i had the fenders meesed with when i did the body kit.. but i dont ever rub

 

Right, thats what I meant, by "custom work guys", also I dont belive you have your front down to less than 1finger gap yet correct? The 245 just seems to be a easier route on the 255. I have only seen a couple GS's slammed with 255 up front.

 

ok now that really makes the problem worse. i only know a handful of people with 255 in the front. with your 9 i think 245 is still a better choice

most people they just have 245 in the front and 275/285 in the back

 

the vibration, that's weird. you should probably try to get an alignement and see what's up. its weird that you are getting that kind of vibration. the shop is sure that all the bolts are tightened up correctly right?

and for me, besides the 245 in the front just to make it fit better and reduce as much rubbing as possible, i would go ahead and get the 275 for the back too. that's the real staggered setup

 

I got the alignment and lowering done at Johnson's Alignment. For those of you who are located in the South Bay of Cali, you may know that they are one of the best around. However I will still take the car back tomorrow and let them check on it one more time. It certainly isn't normal.

 

not sure, but i have never heard about them before. a lot of us go to custom alignment in mountain view, they are specialized in race car suspension tuning, and they know about lowered cars a lot

 

The bolt-rubbing issue in front has to do with a combination of wheel offset and tire size. If it's a 20x9 with an offset higher than +38, it will likely rub with a 255/35-20 tire. Mine works with no bolt mods because I am using a 20x9 +35 with a 255/35-20- this puts the tire more outboard of the bolt. I specified the wheels this way because I was aware of this issue (it's my job!)

The bolt mod is no big deal- this is done on Mercedes cars frequently. The extra threads are there to make 'starting' the bolt easier during assembly of the ball joint/upright. This 'bolt' can be sanded or ground down flush with the top of the nut if necessary. Because the threads are exposed in this region, for all intents and purposes, there is no stress in this region.

Let them sand away- and the sooner the better- otherwise, you'll end up with a nasty groove in the tire.

The vibration issue has nothing to do with the suspension or alignment- 99% of the tire it is wheel/tire related.
The Lexus cars are very sensitive to wheel balance and wheel hubcentricity. I don't know much about the wheels you have, but more than likely they require a "hub-centric ring" to be properly centered on the hubs when the wheels are installed.

No amount of re-balancing in the world will rectify the vibration you are experiencing if the wheels are not centered on the car! Any tire dealer worth a bag of sand will know what these are, so ask them if your wheels require these and if they installed in your wheels- if not, they should install them.

 

interesting stuff there bob well i didn't hve vibration on my hre when i first got them, but lately i got a bit vibration. i know my front bushings are very worn. so we will see if that's the cause, hopefully soon

 

Well as it turns out, I got new hub rings and had the tires rebalanced at the same time. And with pride I can now say that I am officially rolling on smooth 20"s.

Now onto the next step....

 

that's awesome glad to see that the vibration is gone now