They tend to fail at the valves.So far so good on the Pirelli SmartTube. I haven’t really put too much mileage on them yet though (~100mi). OTOH, the bike is heavy and I’m a big guy, so they can’t be THAT weak… I usually carry a spare with me too as well as a patch kit..
What crank did you put on?
 
					
				 
						
					 
					
				 
						
					 
					
				 
 
		 
 
		 
					
				 
 
		 
 
		 
 
		 
 
		