ADAPTRAC is a multi-component system comprised of special patent pending hubs, a dual control valve and a C02 power pack/regulator. Tire pressure can be raised or lowered while riding with a quick press of the finger on the handlebar control toggles. Actual tire pressure is displayed on analog gauges mounted on the handlebars. The system utilizes 12x142mm rear and 15mm front axle standards – wheels can be removed as you would normally. ADAPTRAC uses readily available, rechargeable C02 tanks ranging from 4 to 20 ounces so you can carry only what you need. You can now tune your tire pressure to the trail – in seconds!