520 ERT3 ChainERT chain designed for motocrossHigh-performance, lightweight, low-friction chains designed exclusively for racingNon-sealed 520ERT3 is D.I.D's #1 selling motocross chain and is used by many factory race teamsBecause of its strength/weight ratio, this is the go-to chain for riders across a multitude of racing disciplines, especially among the 250 class