Using a hand pump to fix a flat can be cumbersome at best. A couple of CO2 cartridges make quick work of the job but you have to remember to bring them with you in the first place. And if you are traveling with your bike, finding cartridges at your destination isn’t always possible. As an alternative, the Bimp’Air refillable compressed air system stays on your bike and continually tops up as you ride, meaning you always have compressed air on hand to inflate a tube or top up your shocks.