From My experience after having way to many flats off and on roading. The co2 cartrages work the best with tubes. You may have to finish with a hand pump. We use the pumps that do both. Spend the extra few dollars for the good pump. If you are worried about filling the tire to fast the trigger on the pumps allow you to adjust the air flow. The cartrage never seems to fill compleatly. It can be a pain to get the cartrage to work wright.
Fix a flat has never worked except in tubeless tires. If you read the instructions it even says not to use in tubes.
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Rocket Ron
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