cyccommute Posted: Just to be clear, I’m not all that thrilled with the performance of modern butyl tubes as I’ve experienced many, many flats that are the result of the tube being over-stretched towards the rim which causes them to tear and leak. However, I can fix those easily and butyl tubes are cheap.
I have had more flats on butyl rubber tubs from the bad tube and not the punctures. I immediately replace tubes on new bicycles with tubes made by Continental or Schwalbe. I run the largest width tube that will fit the tire diameter. like you I tried some quality TPU tubes and found them lacking in durability and I haven't even tried to patch them I just went back to the butyl rubber.