ZeeOSix

I think there are a couple of members here who are running Cray Brickyard wheels on their C5 Z06. I think one has a 18 front & 19 rear setup and the other a 19 front & 20 rear setup.

I have a question on which wheel widths you went with, and if you went with the 11" wide rear wheel did you use a 295 or a 305 rear tire. Was there any clearance issues with the rear brake cooling ducts? There is maybe only about 1/2 to 5/8" clearance at the tightest point now with the OEM Z06 wheels & tires.

I know with the 11" rears, that all the extra 1/2" width is going to be on the inside of the wheel when mounted due to the offset. The 11" wide rear Brickyard is actually a C7 fitment. The offset on the 11" wide wheel is +73 mm, which means the inside rim lip is actually going to be about 21 mm more inward (more inward offset + extra 1/2" width) than the stock 10.5" wide OEM wheel.

I think one member mentioned he used 1/4" spaces on the rear ... is that because the tire was rubbing on the rear brake duct?

Anyway, if you guys read this could you chime in with some info/details on any fitment issues or suggestions. I'm thinking sticking with the 10.5" rear width might be the way to go. Could use either a 295 or a 305 tire on the 10.5" rear I would think.

Thanks!

ZeeOSix

BTW - forgot to mention that the existing clearance between the rear brake cooling duct and the OEM wheel/tire is a little less on the RH side of the car vs the LH side. Not by much, maybe 1/8" less.

I made a template based on the Cray 10.5" wide wheels with the +65 mm offset with a 305 tire on it, and it looks like there might be about 2 mm clearance left with the cooling duct - maybe too close for comfort. Using a 295 tire on the 10.5" wheel would definitely clear OK.

Based on my template, the 11" wide wheel with the +73 mm offset, even with a 295 tire on it would probably rub on the duct ... rub for sure with a 305 on the 11" wheel. That's what I need to confirm from someone who actually has the Cray Brickyards on their C5 Z06 to verify my analysis on paper.

Rookieracer

19 x 10.5" wheel 65mm 305/30-19 Pilot Sport rubbed slightly on the inner fender at the top in a hard corner through the canyons.

Bilstein shocks and Hotchkis bars.

ZeeOSix

Thanks for the info ... are you lowered some? Must have been doing some heavy Gs in the corners.

The 19 x 10.5 wheel will put the inner side of the tire 7 mm inward, plus about another 5 mm inward due to the 305 tire compared to the OEM Z06 setup, so I can understand how the inner top fender got rubbed by the inside corner of the tire in that situation.

I take it no rubbing on the rear brake cooling duct?

Rookieracer

Lowered in the front all the way on stock bolts without cutting pads. Lowered rear to match and then aligned to the Pfadt aggressive street settings.
Brake ducts ok.

troyguitar

I'm the one with the 19x11 rears and 1/4" spacers, using 305/30 bridgestone re-11. I don't remember the brake ducts being an issue but the tire is very close to the inner fender even with the spacer. I don't know if I've actually tried fitting them without the spacer to be honest - they also would look too sunken in without it in my opinion. Ideally they'd probably fit best with more like 10mm or 1/2" spacers but those would require new studs too.

ZeeOSix

I'm thinking without the spacers, the inside corner of the tire would probably be rubbing on the cooling duct. If you stick your hand inside the front of the tire you should be able to feel how close the tire is to the duct at the inside corner of the tire.

Where are you guys placing the tape-on balance weights on the outside of the Brickyard? I'm thinking up off the main lip behind the spokes so it's not so obvious. Should still be able to do a 2-plane balance that way with tape on weights I would assume.

A Marsh

I have 18x9x50mm front and 19x10.5x65mm rear.

My tires, 275/35-18 and 305/30-19 Continental Extreme Contact DW, are being mounted Tuesday.

I'll post my observations afterward.

Stock ride height

troyguitar

I'll probably put mine back on my car next week as temps are finally supposed to get into the 40's, will try to take a closer look at everything then.

ZeeOSix

A Marsh and troyguitar ... thanks and appreciate more info from you guys.

A Marsh - the 18 x 9.5, +56 mm offset (C7 application) might work better on the front for you with the 275/35-18 tires. That's what my data crunching shows anyway.

ZeeOSix

Forgot to mention. For the rears, if Cray would have made the 19 x 10.5 in +60 mm offset instead of +65 mm, they would have sat only 2 mm inward compared to the OEM Z06 wheels. IMO, the OEM Z06 rears stick out beyond the fenders a hair, so maybe Cray did the +65 mm offset to bring the outside edge of the wheel flush with the fender lip.

troyguitar

I think they just did +65mm offset on the 10.5's because the wheels are made by TSW and all of the other TSW 10.5" wide wheels are already made at +65mm.

With the 1/4" spacer my wheels are 2.3mm further in than OEM on the outside (+73mm offset minus 6.35mm spacer and another 6.35mm from the extra wheel width = 60.3mm "effective offset" to compare to the OE rears) - but on the inside they are 15mm closer to the fender.

Another thing to consider: All of these calculations are at the center of the wheel and ignoring camber. I'm running a lot more camber than stock so my effective inner clearance is even further reduced (the top sidewall of a tire is around 10mm further in than stock with an extra degree of negative camber) to the point where I think a 10-15 mm spacer would be ideal on my car.

If you're under a degree of negative camber I think a ~5mm spacer would be perfect with the 11" wide +73mm wheels OR the 10.5" +65mm stuff but probably not required for either.

A Marsh

Check out the photos of mguerra's Brickyards. He has 275s on 9" wheels and the look pretty right.

I currently have 265s on 9.5" reproduction C6 wheels and think they look stretched compared to the 295s on 10.5" rear wheels.

I figured the sidewalls of the 275s and 305s would have about the same appearance. If I don't like the fronts, I'll have the 265s put on.

https://www.corvetteforum.com/forums...hey-re-on.html

ZeeOSix

A Marsh, thanks for the link. His car look great.

So I see photos of Cray Brickyard wheels with a center cap with the Corvette emblem on them. And see some Brickyard with the Cray emblem. I'm assuming they come with the Cray emblem and you guys are buying different center caps or putting different decals on the caps?

What's the scoop on that? And also, what are the Cray center caps made of ... metal or plastic?

Rookieracer

Cray center caps are plastic. I had my wheels chrome plated by California Chrome Wheel and they supplied the new chrome center caps. I set the Cray caps aside.

mguerra

Hi Zee0Six, I have the Blue CE with the 19/20 setup that you were looking at. The Cray logos on the center caps started to peal off within the first two weeks of mounting the wheels on the car (yeah, I was pissed). I found set of C6 center caps on eBay for about $20.00, they're plastic as well. Best $20.00 I've spent!

troyguitar

I'm also running oem C6 center caps pulled from my spare/winter wheels, they're directly interchangeable with the cray ones.

A Marsh

I installed my wheels and tires yesterday. I've attached three cell phone photos.

The wheels are 18x9 and 19x10.5. The offsets are 50mm and 65mm.

The tires are 275/35-18 and 305/30-19 Continental Extreme Contact DW.

The sidewalls match very well. I may install 3mm spacers on the back. The fronts stick out very slightly compared to the rears. That wouldn't be the case with 265s.

The car is at stock ride height. I've had no rubbing or clearance problems.

I'll post better photos later.

troyguitar

I put mine back on the car this week and can confirm that a 5mm spacer is necessary with the 11" wide versions. Longer studs and a 10-15mm spacer would be ideal.

A Marsh

I wasn't happy with the looks of my wheel/tire combo.

I changed from 275/35-18 on the front to 265/35-18 and am pleased with the results.

Compared to the 305/30-19s on the rear, the 275 sidewalls were noticeably taller and didn't look right. Additionally, the sidewall was more square, which accentuated the added sidewall height. The 275 fronts also stuck out a bit too much.

I've attached some cell phone photos with the 265s mounted.

In the two end-on photos the steering wheel is turned slightly to the left.

Please ignore how dirty the car is.