Around my house there're plenty of hilly desert canyons (34 19 16 by 116 23 41 if you want to check it out with google earth) and a few steep downhills all created by offroaders. There are a few smaller runs that look like they're 40-50% grade, and one 1/10th of a mile stretch that's ~25% grade. I'd love to take a shot at this downhill, but it's rock, sand, and gravel, right next to a steep canyon, so if I slide on the wrong side I'll roll down the hill. Is there any way I could negoiate this, or should I just pass on it? Also, can I even take some of those 40% grade 30 foot decents, or will I just go over my handlbars. I have a trek 820 hardtail if that makes any diference.