The Good and the Bad
This is a tricky review because yes/no does not work. One tube worked perfectly.... for latex. This means that you will need to pump it up a little before each ride.
The other tube could not hold air for more than a few hours. After an overnight, the tire is dead flat. I took the "problem" tube out and did the tube in the sink thing and not a single bubble was visible. My guess is there was some thinner parts of the latex membrane that were letting air migrate, but at such a low rate there was no visible location. Again, not an issue for the other tire.
The ride with these latex tubes is awesome. I use them with challenge gravels grinders at about 40lbs. The difference between butyl and latex is pronounced. Latex = butter. Butyl does not. Yay butter.
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