So true. The current tube-less tires have a very stiff bead since they're designed to hold all the air in with contact on the rim. Older tube-type tires didn't have such a stiff bead since the tube inside kept the air in. Pretty difficult to find tube-type tires if at all.
On a hot day, after you have let this tire sit on a black asphalt driveway in direct sun for a couple of hours.
My F800GS has tube-type tires...or rather uses tires that can be used either with or without tubes. The Heidenau K-60 I installed on the rear, with a tube is one of the toughest tires I have ever mounted. Great, tough tire.
OM