Some time ago I stopped to help an MTBer in distress at the roadside. He had punctured and didn't have a spare tube. I offered him one of my spares but he thought I was mad. I'm pretty sure it would have been an effective get-you-home. In the end I gave him a packet of Skabs and left him to it. (I suspect he had already phoned or decided to phone for rescue).Not recommended but I got away with a 700c x 20mm tube on my MTB today ( with 35mm tyres). I forgot to swap spare tubes in my bag this morning as I changed bikes today as ut was raining !!
Similar experience to me. I've got away with pumping a punctured tyre at the roadside then riding home on it to repair later on several occasions. Another reason to carry a real pump not CO2! Also had a small thorn in the back tyre of my hack MTB that took two or three days to get really soft.My experience is that stretched tubes go completely flat immediately on encountering anything sharp, but that unstretched tubes can leak fairly slowly, allowing you to delay changing tubes until you get home.
In one case, I had a half inch thorn through the tube for about 6 weeks, which only needed pumping every couple of days
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