What's your top speed?

I've seen it done on fast descents (By OLC for one) and quite frankly it shat me up just to watch. Not least of all because I was on his back wheel and not expecting it!

I can do it at speed on the flat but obviously I'm not usually spinning as quickly as on a descent. Cheers, I'll see if I can practice that. What you say makes sense.

Best advice I ever read for riding fixed down steep/long hills...

'if you feel yourself spinning out, pedal faster and get control of the gear before slowing'

Seems silly but it works.