Thread: The Official what you need and how-to for CTS-V brakes

WBS lines are probably ZZP.

So who has a better price?

Originally Posted by Drunkie

I mention the GXP wheels being identical to your SS wheels because guys have fit the CTS-v calipers on with GXP wheels, you should be able to do the same then

I understood what you meant, I should have been more clear. My bad, the GXP wheels have a lower offset than the SS wheels. I don't remember what it was, but its not +52 like the SS 18s. My stock 12" brakes are a tight fit with the SS wheels, as far as width. Maybe that's why the GXP was the only one to get bigger brakes from the factory. Maybe they designed the wheels first, I wouldn't put it past GM back in '06. haha

So, got my car all blown apart. Went to put the rotors on and they don't fit over the hub...what now?

At first I though they weren't fitting over the knural part of my new arp studs but after measuring with a micrometer we found the rotor to be off by 100 1000s, and found the center bore to be slightly small.

So I needed new hubs, the new ones fit perfectly. However, even with the 5/8"(about 15.5mm) spacer, the SS wheels still didn't clear. What size wheels are all you guys running. I think I need a wheel that's 18x7 with 35mm offset, which is hard to come by for cheap winter duty wheels. HELP!

i wasn't hitting by much!.. i am going to try some spacers and see if that will work.. also i have to get my tires rebalanced after, dont know if you can see but the weights are def. not going to clear the side of the caliper... i have maybe 3-4mm max of room between the side of the caliper and the rim lol

update: ok so went out and bought some cheap-o 5/16" spacers from Advanced(just as a temp. mock-up fix).. looks like my rims are a no-go I think the spacer needed to be like 1-2mm thicker.. buuut the problem now is the way my rims are shaped it doesn't allow any clearance on the side of the caliper and inside rim.. i would just be grinding down my rims and new calipers ... soo looks like new rims are in my future!

Drunkie do you think 38mm offset will be enough? it is hard to find good rims lower then that

are the Tenzos your new rims?

Rims are a big issue with this upgrade, I new summer and winter sets. My 20x9 Lexani LSS5's with a +35mm offset didn't fit either. So I added a 1/4" spacer, got it off the lift, went for a cruise up to 60 MPH: no problem, burnout + 380 ft-lbs = 10 bent ass ARP wheel studs ...these brake are my kriptonite. But damn does the car stop, as good as if not better than my C5 Z! I've come to the conclusion that unless the offset is +20 or similar on a 7.5" rim, the wheel cannot have a lip, the spokes must be as far outward and as thin as possible and even then an 18x7.5 +38s didn't fit either heres the pic of them I might cut my losses and just throw these on the Vette with some black centenial edition rims, and get some GXP 13"s on the SS

If anyone is aware of an inexpensive 18" that will work I'd love to know! now I know why only you GP guys are doing this upgrade with the GXP wheels.

ok so i think i narrowed down some rims that should work... think i might be getting these what do yall think
18x8.5" +35mm offset