OK,
I have been running the version 1 front spacer in 10mm and the version 2 in 20mm. I took the rears off and still had vibrations with my street tires.

Got my track wheels and tires. Now running 25mm rear version 2 and no front spacer - all smooth.

Put the 10mm spacers on the front today and vibration is back. Removed them and its gone.

Time to pop the longer studs out of the front and try the 20mm version 2s on front next. Its just going to be a real bitch trying to remove the longer studs (I tried a little before but gave up.)

I hate to see someone else with this problem, but at least someone can relate now. The one thing that i noticed was that the centering ring sits back a few mm's from the face of the spacer. I also noticed when you test fit the centering ring to the wheel itself, if the ring is pulled back from the rim even a little, there is slop. I was thinking of having the spacers milled down until they ar the same exact thickness as the rings.

Yea, it would be nice if the wheel portion of the ring went deeper

I decided on H&R spacers. The hubcentric ring is a part of the spacer, all one piece, cut that way, not a separate piece to fit. I am glad you guys shared this with the forum.

John

Got a link to the h&rs?

let us know how they work. When I went to the hr website, they had none listed for the 370 and when i called they said they hadnt developed one for the 370 yet.

H&R TRAK+® Wheel Spacers | Products || H&R Special Springs, LP

I think the 350 spacers fit, same bolt pattern.

keep us informed. the 15's up front look perfect, by the way. 20's out back.

Hey John, The H&Rs look like a better spacer design to me with the hubcentric ring integrated. Have you gotten them on yet? Are you happy with them? Where did you get them? How much $?
Sorry for all the questions; I was ready to order the Ichaba 20mm for the front and rear till I ran across this thread. Thx, Dennis

I had them installed last week, no issues and happy with the purchase. Paul at AE performance can get them got you, here is a link to his thread on his Z:

http://www.the370z.com/members-370z-...z-project.html

John

That's good news.
Thanks for the quick reply.
Dennis

You're very welcome! Remember, I only did the rear, but the quality is high, and I prefered the "one piece" hub as a part of the machined product. I would hope there is no issue on the fronts as well.

John

I don't get it, the ichiba are one piece too, no?

I think they are two piece, meaning the hub centric section is a separate piece that you place inside the ring. Doesn't really matter I don't think, many here use the ichibas, I just wanted the one piece spacer, one less thing for me to lose :icon17:

H&R very good over the others, you pay more but the quality is there and the hub centric ring integrated. Top notch, I had them (20mm fr & rr) on my 350Z with stock rims and went with replacing the studs.

What size did you go with in the rear and the part#?

And has anyone done the fronts yet with success (larger than 10mm)?

Any pics?