Gravel tires and modern road setups have pushed tire volumes beyond what 16g cartridges handle comfortably. A 700x40c tire needs roughly 25% more air than a 700x28c to reach the same pressure, and that math doesn't work with the standard road cartridge size. The Lezyne 20 Gram CO2 Cartridge bridges the gap—20% more gas than a 16g in a package that's only marginally larger, making it the practical choice for gravel bikes, wider road tires, and light trail use.

The capacity increase means you can inflate a 40mm gravel tire to full riding pressure from flat, or push a 29x2.0" mountain tire into the mid-30 psi range where it's actually rideable on hardpack. For road riders who've moved to 32mm or wider rubber, the 20g provides enough headroom to reach proper pressure without that anxious moment wondering if the cartridge will run out before the tire firms up.

These cartridges use the standard threaded interface that fits all Lezyne inflators and virtually every third-party threaded CO2 head on the market. The threading provides a secure connection during inflation, so you're not wasting gas to a poor seal. Like all CO2 cartridges, these work best as emergency inflation—CO2 permeates through rubber faster than air, so plan to top off with a floor pump when you get home.... Read More