Kenda has decided to make some of its tubes with a non re moveable presta valve. In our area we have goat head thorns and despite tube guards and puncture resistant tires, the tubes get punctured. To prevent having to repair flats weekly, we add slime to the tires. On the road you can rotate the tire, and use an inflator and ride on. When the tube does not have a removable presta valve, you cannot add slime, the tube then is relatively useless.
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