Well they said I'd have to eventually do it and here's the proof. Me on a road bike. No knobbies or suspension at all. It was pretty cool doing the climb in half the time it usually takes though (I ride this on my DH rig to access a couple of trails). I followed Adam on the downhill since he knows the curves well enough to keep me from killing myself. We actually hit some pretty respectable speeds too. Jason caught up to us midway down and we really let it go. Unfortunately the battery died in the camera just as we started the fastest section :( Oh well, just another excuse to do it again. The biggest surprise for me is how stable these bike are at speed. Much more forgiving than I expected.