Gold medal for Cassells and Chambers
Chambers and Cassells set a European record of 6:28.58 to edge out France with Germany in third.
Chambers and Cassells led from start to finish and held off a fast finish from the French boat - Augustin Mouterde and Theophile Onfroy - to win by just three-tenths of a a second.
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Hide AdThe lightweight pair is a non-Olympic class event but the Coleraine pair hope this result puts pressure on the current GB lightweight four quartet ahead of the second World Cup regatta in Varese, Italy in three weeks.
Peter Chambers won a world title in the lightweight pair in 2011 before going on to win Olympic silver a year later in the lightweight four, while Cassells was making his international senior debut.