Originally Posted by
milkbaby
[...]
I've also read that a patched tube will sometimes appear to hold air when inflated freely outside a tire but then will actually leak when installed inside a tire. So should I take out the fresh tube and save it for emergency roadside flat replacement and install the patched tube to ride on? When I'm out riding, I don't want my spare tube to be a leaky one!
When I patch a tube, I let it sit for a day and then put it in a "shop" wheel, gas it up, and let it sit for a day or two to see if it holds air. Then, I'll install it and ride it. I never carry a patched tube that I haven't tested as a spare.