it depends on how rough/tight & whats on the trail (drop, chute, off camber, tight switch back, nasty roots), so it varies a lot - so you could be going 5mph, and seconds later doing 30. The fastest I ever went was at a end of one race where the last section was just going straight down a ski slope, my DH bike is setup 1x9 and I was in the biggest gear pedaling as fast as I could, my guess is close to 35-40mph
that 1st pic I took (so obviously it wasnt me in it) but heres one of me hitting a drop |