I decided ride my kh 36er uicycyle at the very steep and rocky Hummingbird trail in Simi Valley on 4/30/11. The wind was insane, gusting close to 60 mph at times. I actually got blown off my uni more than once, the wind was so strong!
This is definitely one of those trails that you'd put in the advanced category! Mtbers here almost always have full face helmets and leg/arm guards, as this trail will test your skills to the max, and it is quite UNforgiving if you make mistakes!