Thanks to special carcasses the up to 60mm wide tyres offer exceptional low rolling resistance with air pressure of merely 2 Bar (29 psi). Balloon tyres reduce the vibration on the handlebars by up to 36%. they have excellent responsiveness and relieve your spinal discs. Despite the low tyre pressure and better comfort these tyres need approx. 11% less energy than a comparable trekking tyre. (also see balloonbikes.com)