[youloze]

Hi, all. I recently changed wheels to 20" all around and increase tire width to 285 front and 295 rear. So my current setup is 20x10 with 285/30-20 in front and 20x11 with 295/30-20 in rear.

The car has been lowered on AST adjustables and aligned since the first week.

When I was on the OEM tire setup and lowered with alignment the car was so stable and planted, both in the straights and corners. All I did was upgrade to the new wheel/tire setup and now the car is extremely twitchy and will shift direction on a whim (tramlining). I took it back for a second alignment and the rear left toe was out so that was corrected and I had him give me some more tow in all around for more stability. It's still very twitchy and not confidence inspiring at all.

So my question to the guys that went with 20" up front with wider than OEM ties is - did your car feel much more twitchy and tramline? If so, were you able to dial in more toe to help correct it?

Below are my current settings. I could probably have him give more toe in up front, but I don't want to go that route unless I know it will help significantly.

Thanks!

[Click_ID]

I’ve always referred to this as "Nibbing"—essentially, with the AST setup, you’re getting less suspension range. AST is one of the lower-dropping kits for HAS out there, offering nearly a full inch more drop compared to KW or M Performance.

Given that you’ve upsized your tires, your suspension is working even harder, which could be contributing to the issue.

I feel like this is one of the simplest explanations. I’ve heard similar feedback from others who max out their drop and push 20x4. In fact, I’ve even heard the opposite—floating, no feel, like driving on ice.

Hopefully, your struts hold up, but I think it might only be a matter of time before they give out. From my experience, a 19/20 setup is more balanced. I’ve never had any issues at speed and just made the drive to Mpact this weekend without a hitch. You might want to consider downsizing the front tires, raising your overall height, or switching to coilovers.

Interestingly, if you take a look at KW HAS kits, they don’t seem to drop the front as aggressively as the rear. I’m not sure if that’s intentional to avoid the issue you’re experiencing, but it’s something I’ve noticed.

Good luck with your setup! I hope you find the right balance to achieve the look and feel you’re going for.

[youloze]

Originally Posted by Click_ID

I’ve always referred to this as "Nibbing"—essentially, with the AST setup, you’re getting less suspension range. AST is one of the lower-dropping kits for HAS out there, offering nearly a full inch more drop compared to KW or M Performance.

Given that you’ve upsized your tires, your suspension is working even harder, which could be contributing to the issue.

I feel like this is one of the simplest explanations. I’ve heard similar feedback from others who max out their drop and push 20x4. In fact, I’ve even heard the opposite—floating, no feel, like driving on ice.

Hopefully, your struts hold up, but I think it might only be a matter of time before they give out. From my experience, a 19/20 setup is more balanced. I’ve never had any issues at speed and just made the drive to Mpact this weekend without a hitch. You might want to consider downsizing the front tires, raising your overall height, or switching to coilovers.

Interestingly, if you take a look at KW HAS kits, they don’t seem to drop the front as aggressively as the rear. I’m not sure if that’s intentional to avoid the issue you’re experiencing, but it’s something I’ve noticed.

Good luck with your setup! I hope you find the right balance to achieve the look and feel you’re going for.

Thanks for the reply! It's really strange, because I was on the coilovers well before the new wheels/tires and it was fine. I honestly didn't think such a small change in wheel/tire size would cause this drastic handling change.

I'm wondering if others with the same setup are experiencing the same and if not, what their alignment specs look like.

I'm a bit bummed, because the look is great, but the change in handling has taken a hit that I didn't expect.

[KC87ZB]

Another question to answer would be what tires are you running. Tire choice can significantly alter the handling and the feeling of the car.

[youloze]

Originally Posted by KC87ZB

Another question to answer would be what tires are you running. Tire choice can significantly alter the handling and the feeling of the car.

Same type of tires that I was running on the OEM wheels. Michelin PS4S. The only thing that changed was the 20s up front and went from 275 to 285.