Please keep in mind that the profile series is just a percentage of the section width, its not a measure of the actual height of the sidewall. A 305/35 (like on the rear of the ZL1) actually has about a 1/4 inch more sidewall than a 205/50 tire does. Because they are so wide, roughly 1 foot, you still end up with over 4 inches of sidewall on the ZL1.
Note, if I've gotten any facts wrong in the above, just ignore any points I made with them
don't believe a thing you read about the next gen Camaro -- as history has proven time and time again:
WE DO NOT TALK ABOUT FUTURE PRODUCT PLANS PERIOD FbodFather
Camaro5 Fest sub-forum