Thanks Sarg and Matt.
I just picked 3 images at random. The sun was not out in the last 2. Fill flash will have zero effect from the distance of these shots, trust me on that. The last 2 are at 1/40. You are lucky to see anything in focus at this shutter speed. The bikes are travelling at 140k's + at that point in the track and when I press the shutter. Not sure if you are on top of the math Matt, but ....
Here is a couple in full sun for your information @ 1/160 and he is doing 240+..


Thanks for the comments. Its good to get some feedback.