These are a replica C6/Z wheel and believe the are 18x10, but unsure of the backspace.
no spacers needed
I can get a pic of the wheels on the car tomorrow.
This is a 6 speed / LS3 car.
We could for sure use a gear with this tire combo since we do not use much of 4th as it is.
tire info :
DOT Certified
TUBELESS
Comparable Race Size 12.5/28.0R18
# Tread Width: 12.3"
# Section Width: 13.8"
# Diameter: 28.0"
# Circumference: 88.0"
# Rim Size: 13.0"
# Code: ROD-23
We hope to be back at the track within the next week for our 10 sec pass...we have a little back up now as well :
http://www.camaro5.com/forums/showthread.php?t=45318