Under inflated tires take more energy to push down the road so that the resistance will be increased. For the A-bike small and exquisite  tire, its need higher pressure to operate. So we suggest that when you feel it is very arduous to ride, check your tire pressure often  and assure pump your tire as soon as possible.

We recommend you a very easy method to check your tire pressure. Squeeze the tire, if it is very hard to squeeze the tire, it means there is no need to pump; if not, do it now!

There are some pictures to teach you how to pump.

Connect the input and pump tightly.

Make sure that it connects well.

Put valve extension into the input.

Start to pump.

Pay attention on the inflation possibility.

Pluck off the valve extension.

Check whether it pump adequately.

We specially shoot a video to teach you how to use this valve extension and pump. This video has already been published on our Chinese official website.