From this posting,
http://news.motorcycle.com/article.motml?sid=2771
Originally Posted by mps165
To give you guys an idea of the difference in speed, Eric Bostrom had a pole time of 1:46.835 at Daytona this year. In happy hour this year at the Rolex 24 at Daytona, Tony Stewart ran a 1:49.422. To put it in another perspective, Marco Andretti ran a fastest lap of 2:11:542 at Daytona in a Skip Barber car (open wheel, wings, 150 HP, 1250 lbs fully fueled). Crappy (i.e. guys that are still way better than us) were running near 2:00.00 lap times at the Daytona 200 on superbike GSX-R1000s. And in the last perspective, the best SCCA raced prepared Mazda Miata (SSB class) at Daytona ran a 2:29.004. That is a huge difference to even the "shitty" superbike riders. Regardless of what is "faster" both cars and motorcycles are fun when driving at full speed. And believe me, a stock motorcycle goes through corners WAY faster than a stock car. There is one corner near where I live that my car (Camaro SS ~ .86 Gs on a skid pad) right before it starts to break away can manage maybe 102 mph. My bike, which I am not fully maxed out on, goes through the same corner over 130 mph. Mind you the bikes speedometer is off a good bit, but still. And this is a good comparison because I race cars and I know how to drive. Just thought I'd shoot my opinion.
Some good information, I think we can come to the conclusion that there is pretty much no race car other than serious open wheeled class cars that can take on GP bikes, both with the best of drivers/riders..