I know this concept contradicts generally accepted trail etiquette but hear me out. What is the big danger when a downhill rider meets an uphill rider on singletrack? A collision which could possibly produce massive injuries. Which rider is most able to avoid a collision? The uphill rider is moving slower, has a greater chance of hearing and seeing the approaching downhill rider and therefore can quickly and safely stop the bike, dismount and move off the trail. I understand the arguement about uphill rythym, cadence and working up the trail but this is the most logical way to avoid a collision. The downhiller may not see the uphiller soon enough and if he does, he may have to lock up the wheel to stop in time. I'm a 215 lb. Clydesdale so when I have no other choice but to climb singletrack, I always stop for downhill traffic using the pause as a rest break. When going down I also stop for uphill traffic when I see them because I'm courteous and at first glance, I think it may be a hiker. If they are mtb'ers, they usually show no intention of stopping for me so I stop for them. Rarely, I encounter a rider who clears the trail for me, the downhill rider, for which I thank them profusely. Nevertheless, when I stop a fun downhill run for uphill riders, the best part of the ride is interrupted. Don't assume I'm a shuttle-loving downhill maniac. I'm a cross-country rider on a 3 inch travel Rocky Mtn. Element or a Bianchi Denali steel hardtail. I mostly do loops with a dirt or paved road climb (being gravitationally challenged, I always choose the easiest way up even if it's a bit longer) followed by a singletrack descent. One other reason why I favor uphill riders yeilding is to not disrupt the funnest part of any ride-the downhill. Stopping a great, flowing, in rythym downhill ride for hikers and horses is obviously mandatory but to do so for fellow mtbers seems ridiculous to me. The uphillers should yield to not mess up another riders' fun knowing that the downhiller probably rode up also and that the uphiller will soon be going downhill as well and does not want to stop unnecessarily. While I'm on the subject, let me suggest that on any loop ride which offers a dirt or paved road climb rather than climbing up the singletrack, please choose to climb up the road especially on busy weekends. I'll give two examples. One is the Mt. Pinos trail system in SoCal. 3 sections of great singletrack totalling about 7 1/2 miles with a gradual paved road to the top. I always go up the road for previously stated reasons but routinely encounter uphill riders (sometimes in groups of 10 or more) who started well before me, on the downhill sections after I have pedalled to the top. The road is about 2 miles longer but it takes less time and you won't mess up the downhill fun of other riders which to me is the most fun of our sport. When I point the wheel down I want to get into the flow of the trail but on this trail I inevitably encounter uphill riders, most riding but always the last 3 or 4 are walking their bikes, who never even consider yielding to me. So I wait for several minutes while the last bike walkers huff and puff past me. By the way, although many do, I have never shuttled Mt Pinos. I've encountered the same situation on the Shultz Creek trail in Flagstaff AZ. This is a great trail with a smooth forest service road which goes up right next to the trail. You can see the trail from the road most of the way and the road is no longer than the trail. Yet when I started down after the dirt road climb, I encountered several uphill riders who showed no sign of yielding. I'm sure there are other examples in every significant mtb area in the country so my appeal is for uphill riders to yield to downhillers on singletrack for primarily safety reasons but also to not mess up the true fun of mtbing which is the downhill and for all mtbers to climb up the road alternative when there is one rather than up the singletrack in order to avoid uphill/downhill encounters. Thank you for your time.