jwiggs wrote:so now why is tubless better, and what if you have a flat on the trail
No pinch flats. With sealant, very little chance for puncture flats as well. Low tire pressures for reasons mentioned above as well as increased traction. Carry a spare tube and pump and it will still work in the rare case you do have a full flat. Most flats with tubeless setups and sealant are a result of "burps" where the tire bead gets pulled out of the rim and air escapes. It's rare, but it does happen.