To recap-The issue was with how the bead was seating into the A-23's, and how my sealant, (MG Homebrew), was allowing thousands of small leaks around the bead seat.
The fix was to mix up the sealant thicker, add in more, and tap the wheel on the ground in a manner that would cause the sealant inside to splash up into the area of the bead seat. This worked and essentially solved the problem. I still had some leakdown, however, but now a ride of an hour's length or more ended up getting everything sealed up perfectly. Now the tires are trouble free, and I have confidence in the set up.
A list of things to note;
- I had slowly gravitated to mixing up my solution for sealant to being less thick. I will rectify that and I should see better results in the future.
- The Velocity tape is slightly different than Stan's yellow tape. My gut instinct is that Stan's tape probably would have worked better in this instance since it is ever so slightly thicker, and slightly less "plastic-like" than the Velocity tape. I have had really good success with Velocity's blue tape, but in this instance, I think the Stan's would have been superior.
- The X'Plor USH is so much better tubeless that I can not even think about running tubes in them ever, with the exception of an emergency repair in the field. I was blown away by how much improved they were tubeless.
- These USH tires are, without a doubt, the skinniest tires I would ever consider running on gravel roads.
Disclaimer: The Clement tires I am using are not tubeless rated tires and you should not set Clement clincher foldable tires up tubeless unless you are willing to assume all risks and void all warranties. I make no claims as to your results if you choose to mount Clement clinchers up tubeless. You are on your own and are responsible for your own decisions.
But I'll still be packing a tube along for rides! ;>)
I did lower the pressures to near 40psi with the rear tire at slightly above that. I think I could edge that down slightly, but a little air pressure change in a tire with little volume is going to make a bigger difference than a big, voluminous tire reduced in air pressure a tiny bit.
So, there you have it so far. I will be back with further updates on the MSO and USH in a month or so. Stay tuned....