These guys, a long running NASCAR radio show, said last week they feel its the way the teams have to set the cars up (causing the blowouts). Part of this Next Gen car...so you run a risk of blowing tires, or slow down...goes back to the "to finish first, first you have to finish". However it works out...plus there are more cautions now and people like that...personally the 18" wheel does NOTHING for me, but I listen on the radio as much as I can and don't care how the cars look.

http://ltnradionetwork.com/