19" Square Fully Rotatable Wheel Setup

[D2M]

I have been running this setup for a few weeks now, I wanted to wait to post until I was able to fully road and also track test this to see if there is any adverse affects.

This is basically 4 OEM 19x11.5 rear wheels with a 25mm spacer up front to make up for the offset difference. I have done similar setups to several cars I have owned in the past, being able to rotate the tires increases their life dramatically if you don't mind the heat cycles.

I can report that its hardly noticeable, seems to have a slightly better turn in response both on street and track at the cost of some slight increase in "tramming" I mean slight on the BS RE-11s, more so noticeable on the Tofeos.. My car has -2.7° camber so the wheels don't stick out too far, according to my math the outside should be about 5mm in vs a stock no camber Z/28.

Below: stock OEM 19x11 front with BS-RE11 325



Below: stock OEM 19x11 front with BS-RE11 325, inner tire to strut clearance.



Below: 25mm bolt on spacer



Below: Wheel with spacer installed.



Below: The OEM rear wheel only has 4 "pockets" machined into the back of the mounting area, the fifth is a U shaped channel. Fortunately it clears perfectly with the 25mm spacer, no stud trimming required.


Below: stock OEM 19x11.5 rear on the front with BS-RE11 325










Below: stock OEM 19x11.5 rear on the front with BS-RE11 325, inner tire to strut clearance.



Below: 19x11.5 square with Pirelli Trofeo 305s

[kramard]

Looks awesome. I'm not worthy. Amazing setup and wish it came from the factory like this!

[Stephen12ZL1]

which camber plates are you using for -2.7°?

[D2M]

Originally Posted by Stephen12ZL1

which camber plates are you using for -2.7°?

The lower knuckle / strut adjustment is maxed out for maximum -camber, the rest is adjusted up top with Monero camber plates set to -2.7° camber and maximum caster.

[frenchsquared]

Are you able to run the 11's with street tires and then run the 11.5" with track tires?
It seems you would need to move the spacer back and forth as you changed sets.

[JTRATX]

Wow, those are some big spacers! I had wondered how big a spacer one would need to pull this off. I never was comfortable running a spacer that big, which is why I went the square Forgeline route. My front spacer is only 6mm and i had to change wheel studs to get full thread engagement.

[zcarczar]

Wheel spacers of that design are huge in the off road world, tons of JK's and Toyotas run them and the wheel and tires weigh considerably more than what we run on our cars. Not to mention the vehicles weigh much more as well, I don't see a problem with it for street use but I wouldn't use it on the track.

[D2M]

Originally Posted by frenchsquared

Are you able to run the 11's with street tires and then run the 11.5" with track tires?
It seems you would need to move the spacer back and forth as you changed sets.

Yes and No.. You can use 4 19x11 front on all 4 corners with no spacers at all, however when you mount a front on the back it will stick out about 1" from the body and just looks awkward.

I currently have a few sets of Trofeos to burn off then will be swapping to a aggressive "street" tire and only be using one set of wheels given that a good street tire is only slightly slower then a set of heat cycled Trofeos, its not really worth it to me as a rotatable street tire will last tenfold vs the Pirelli. Im sure this setup will also increase the life of the Pirelli as well.

[D2M]

Originally Posted by JTRATX

Wow, those are some big spacers! I had wondered how big a spacer one would need to pull this off. I never was comfortable running a spacer that big, which is why I went the square Forgeline route. My front spacer is only 6mm and i had to change wheel studs to get full thread engagement.

900+HP drift spec Corvette with a 345 and 2 sets of spacers stacked...

[The_Raging_Bull]

D2M these are hubcentric spacers right? Thanks for posting. I wondered about this about 3 to 4 weeks ago in a tire thread.Didn't you buy the rear rims that were sold recently?

See my post #26 in this "rear tires thread"
Rear Tires Size Thread

My question - did you try using a thinner spacer, since 25mm is like closing right at an inch. In the thread where one of the members discussed damaging a set of rears (on the inside of the rim) due to contact with the front struts when they were mounted on the front..his comment was there was about 1/8" of metal removed; did you try to make any adjustments to optimize the spacer thickness- like the use of a 15mm hubcentric spacer - and was there enough clearance to use that??

[D2M]

I do remember your comment about this topic Bull.

The spacers are hub centric, this is a absolute MUST for any spacer and any vehicle.

As for the thickness of the spacer the answer is not so simple. The minimum thickness of the spacer will depend on how much negative camber is dialed in at the strut / knuckle bolt adjustment. The more negative camber you adjust in thus moving the top of the wheel / tire closer to the strut the thicker minimum thickness spacer you will need. The less negative camber you have adjusted in the further the top of the wheel / tire is from the strut and a thinner spacer can be used. A drawback to a sub 25mm spacer is that the OEM studs ( or at least one of them ) must be trimmed to fit inside the wheel mounting recesses or replaced with longer studs to go though both the spacer and the wheel, like JTRAX is using on his aftermarket wheels. For my application a 25mm is the absolute minimum thickness as I am maxed out on the negative camber adjustment at the strut / knuckle bolt. As you can see in the pics the clearance has not changed, top is 19x11 no spacer, bottom is 19x11.5 with 25mm spacer.

[D2M]

There are some videos from my track test of this setup. I had no issues at all and came home with all 4 wheels on the car. I have to get used to the bit quicker turn in response the car seems to have now. Not my best times ( humid and greasy ) but was a super fun day and the car was amazing all day long.

[Stephen12ZL1]

nice! Please post your rear camber setting, front & rear toe, etc.

[D2M]

Front:
Camber -2.7°
Caster 7.0°
Toe .01 out
Total toe .02 out

Rear:
Camber -1.4°
Toe .05 in
Total toe .10 in