I feel ya Crankin! Fastest I've hit so far is 35.5mph (on a 'safe downhill'), I was feeling quite proud until I heard others after the ride talk about hitting upwards of 45mph. I know what prevents me from descending well is my head. I have this reoccuring thought that when I'm flying downhill, I'll hit a sharp rock and bust the front tire and go airborne into a ravine or face first into a tree. Yes, quite graphic I know, but nonetheless it's that thought that keeps me fearful of going downhill.