Specialized CPRO2 Trigger CO2 inflator

Despite being the smallest inflator on test, the metal CPRO2 has a reassuringly solid feel. It’s also the simplest design here, with a mechanism that releases gas as the head is compressed against the valve. A short plastic tube allows the canister to be partially screwed into the head without piercing the seal – a simple but effective solution for transporting a cartridge.

There’s no insulating sleeve, so wear gloves while using it. It also only accepts Presta valves.

Price $32 w/16g cartridge

Cannondale Trail SL 29 SS

The fat aluminium tubes are a constrast to the skinny items seen elsewhere in the test, but this rigid Cannondale uses them to create one of the most old-school - and lightest - rides here.

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KONA SHRED

With a reputation for no-nonsense ruggedness and a background in the always progressive and punishing riding of Canada, Kona have been building hardcore hardtails for longer than almost anyone else. The Shred is the most expensive bike on test but it’s a proper trail tank.

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SKS Airbuster CO2 inflator

The alloy Airbuster has a large knob so you can regulate the flow of gas, a mechanical stop to prevent the cartridge being pierced in transit and a dust cap to keep the valve free of debris. While it works with Presta and Schrader valves, switching between them requires a fiddly change of the valve head. The thin rubber sleeve doesn’t provide much protection from cold spent canisters. You can’t insert much of the valve into the inflator head, so you have to be careful to avoid leaks. Price $33 w/16g cartridge

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