The big choice for every purchase – and every ride – is whether to use a pump or inflator. Pumps are bulkier and slower to use, but the air you use is free and you can top up pressure accurately as many times as you need to. CO2 inflators are much smaller and provide an instant inflation hit if they work right, making them great for race or emergency situations. Cartridges are expensive though, even if you buy big catering packs on the internet, and make sure you recycle the cartridges to minimize waste. If you want the best of both worlds, then a combo package like Lezyne’s Pressure Drive is a great option.