On a track with no sand or gravel on it, the bike may have an advantage.
But in the real world, where road conditions are not perfect, I think the car has the advantage.
I was told by one of the people who work at the deals gap store, that a car holds the speed record through the Dragons Tail.
Said the bike ran almost 9 minutes and the car was about 8 1/2 minutes.
They say all the real speed runs are done at night.