We advise 22psi as the highest amount of air pressure to be put in all 3 wheels at any time. It can be slightly lower, but 22 is the highest. If it's any higher than that, the inner tubes will pop, or deflate. We advise using a manual hand/foot pump with a tire gauge attached so that you may keep track of how much air pressure you're putting in the tire. We only recommend using a hand or bike pump. Inflation by a compressor pump is discouraged.
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