Time Trial / Time Trialling / TT

So smoother forehead = faster?

Depends on the yaw angle, the ridges might act as trips :-)

In a decade of tweaking , you could probably find 50 different things which have been changed, each of them accounting for a small improvement.

FWIW, over the same period, I've gone from 25:56 (2004) to 22:31 (2014) for my best 10 mile times, oddly both done on the H10/8 in Charlotteville promotions.