I work at a Chevy dealer, and we have 2 ZR1 wheels sitting in service, and as a joke I said howd the 19 would fit on the back of my trans am. Now my business manager wants me to put my money where my mouth is, and put $1000 down. Now I never bet...i'm the guy that goes to a casino with friends to watch them lose money...but after the math, I feel somewhat up to the challenge. Alright...specs:

1988 Trans Am, 4th gen LS1 Axle with disk brakes, and the bump stop sheet metal removed on both sides, running polished Y2Ks right now, with the 18 in the back, running 285/40/18 with an 1/8th of an inch spacer, along with air shocks jacking my a$$ end in the air.

Wheels are 2011 ZR1 wheels, may be bent, have to confirm why they were warrantied. Using the front 19 for the back of my car, and it's got a 285/30/19 tire.

I already know I'm running 1-1/4" taller tire but someone help me with the back spacing offset difference. I have some specs I got online, and did the math on an online calculator, but someone else please tell me the numbers and I'll reconfirm before I put myself into debt doing this bet. Help! lol