Well, according to the 2007 rule book, for any established class or open record attempt between 150 and 200 mph, you can run a street tire with a VR or ZR rating, and you'll need to run tubes. VR and ZR tires are almost always considered "performance tires", and therefore most of these tires are a lot wider than you would want to run for LSR.
I'm running into that problem myself, and have resigned myself to Goodyear LSR tires.
