The easiest method for filling your tires is to use a simple bike pump such as our Dogger mini-pump rather than a gas station pump. Gas station pumps increase the risk of over-inflation which can damage your inner tubes. When adding air with the bike pump, please ensure that you add enough air so the tires feel firm but not rock hard - in other words you should still be able to squeeze the sides of the tire in with your fingers. If you are located in a hot climate, we recommend putting a little less air in since extreme heat can expand the inner tubes.