The curve of a board from nose to tail when viewed from the side. More rocker helps in steep waves, while less rocker increases speed on flat water.
Rocker is one of the most influential aspects of board design, affecting how a board performs in different conditions. A board with heavy rocker (more curve) has its nose and tail lifted higher, making it fit into the curve of steep, hollow waves and reducing the chance of nose-diving. A board with flat rocker (less curve) sits flatter on the water, planes earlier, and is faster in flat or small conditions.
In surfing, shortboards for powerful waves have pronounced rocker, while fish and grovelers for small waves are much flatter. In windsurfing, slalom boards are very flat for maximum speed, while wave boards have more rocker for maneuverability. Foil boards often have relatively flat rocker since the board leaves the water entirely once foiling.
Understanding rocker helps you pick the right board for the day's conditions.
Example usage
"That board has way too much rocker for these mushy waves — you want something flatter to generate speed."
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