I don't know if it was a bad amount but I used two tubes from the pack I bought and it lasted for a 20-25 mile trip enough same route that I do 2-3 times a week. Couldn't find anything in the tire or rim to cause this and both had air leaks in various places, it looks like one of the seams running down the tube diameter. My tires are 25mm and I inflate them to 100psi. bad only on these tubes.
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