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alocalboy
I’ve had exactly this problem with Veloflex tyres and Vredestein latex tubes. Mine were all blowing at about 90psi. It turned out the plastic cover on my track pump had taken a small knock and was causing friction on the needle. When I was trying to get to 110psi (23mm tyres on 19mm rims) the needle would struggle to move once it got to 70psi. What was actually happening was I was pumping well past what the tube was capable of and just detonating it.