I had a brand new Nutrak tube which had a weak spot in the seam on Saturday afternoon.
It wasn't until I'd removed the valve, installed tube sealant and replaced the valve - and fitted a new tyre - and rehooked the gear cable attachment ring - and tightened up the roller brake torque arm anchor bolt - and the pair of chain tugs - and the fully enclosed chain case - and tensioned the chain - and tightened the wheel nuts up. That it decided to fail.