The Ammann ART 280 Tier 4f is a tyred roller with an easy-load ballast system that helps it adjust to varying conditions on diverse job sites. The modular system enables weight to be adjusted from 9 tonnes to 28 tonnes in an hour – with the help of only a forklift. The ballast and air-on-run systems make it easy to control machine weight and tyre pressure, the two main compaction factors.