I am very bummed about Hutchinson's changes to the Bulldog/Piranha. The new ones are UCI legal, but for 99% of us this is not an issue. I now need to find a tire that i can run tubeless on Ultegra tubleless wheels. Who can share some of their experience with me? no burping please...
I second Hobbanero on Slant 6 tubeless compatible, floor pump up very easy with core removed minimal leakage between rides have bottomed them out several times no burps 30psi and they are cheap.
Update on the PDX- Saturday, I started the Turkey Cross here in Boise with about 30psi in the rear. Too low for me. First lap, I had an ugly remount on concrete after getting stalled behind others on the barriers. Burped the rear, tried nursing it through the lap, but the course had a lot of off camber, rough, sandy sections. Fully flatted, DNF 'cause I don't have a pit wheelset.
For Sunday, I cleaned the sand off of the tire and rim, remounted the tire with a layer of Gorilla tape (1 layer of Velocity tape underneath,) and it aired up well. Ran about 35psi rear, 32 front, no problems.
mostly same course with a couple of changes. I was able to ride that particular barrier section, but there was an additional stair run-up, so same number of remounts.
While I definitely had too little air on Saturday, if I had originally set it up with the Gorilla tape, I think I wouldn't have burped as easily.