AstatenateZ

Okay posted in Wheel / tire even though it could very well be brakes as well...

So just a quick run down, my car has always had aftermarket 19” wheels, 10mm spacer (w/ extended studs) F and 25mm spacer R (bolt on) both Z1 and both hubcentric 66.1 for Nissan vehicles. I had a non hub centric spacer up front at one point and steering wheel vibrated from like 55-80mph. well ever since i got the Z1 hub centric it went away but now it’s coming back?!? Not sure why...

I have a steering wheel vibration on some roads it’s worse than others. Some roads it goes away completely for a little bit. It’s only from 70-80 and then goes way below 70 and above 80mph.

I definitely have warped rotors, at 60k miles idk how that’s possible, 1 owner (older lady) and then myself. I’ve never really done crazy driving b/c of how low I am. But when I brake medium to hard at highway speed 65-70+ I get a shake that is worse the faster I’m going. If I’m braking at 90-100 it’s a pretty bad shake / vibration. So I’ll definitely be replacing rotors to slotted rotors and pads when my brake pads wear out.

I’m pretty knowledgeable when it comes to the Z platform. This isn’t my first one or even my first modified one. I know the basics to look for, can anyone point me in the right direction?

I know it can be a # of things,
1) Wheel weights came off causing unbalanced wheels (very possible as the vibration comes and goes at speed)
2) wheels aren’t torqued properly (already checked and ruled this out)
3) Wheel hub centric Z1 spacers (not sure why it would just now start after being installed a little bit)
4) brake rotors being warped (?) not sure if it can cause the car to vibrate when NOT applying brakes
5) struts being blown I have seen vibrations (I have Tanabe coils and all 4 corners have upgraded stiffer springs and checked out) no fluids leaking from struts or seem soft or anything. Still stiff and new feeling.
6) tire issues (they’re new tires maybe 1-2k miles on them, but possible I guess)
7) alignment (I had an aftermarket camber arm fail less than a month ago and replaced with OEM and had an alignment less than a month ago) steering feels tight. Doesn’t walk either way (unless the road is angled toward one side) so I can pretty comfortably rule that out.
8) I’m not 100% sure what my Wheel hub bore is, or if it has hub rings on my aftermarket wheels, or if it’s not 66.1 I may need hub centric rings on the wheels paired with the hub centric spacers maybe?

Any other ideas or opinions on what of above it could be? Thanks in advance!!