520 MX: The racing atmosphere is ideal for this chain, and its technical structure with the CRK layer on the pins resists to extreme loads as well. Motocross world champions ride this chain. Not suitable for road
>450 ccm engine displacement
Middle static strenght (N) 35800
Weight of 100 links 1.51 kg.

Chain	Pitch (mm)	Inner width (mm)	Roller diameter (mm)	Pin length (mm)	Plate thickness inner/outer (mm)	Middle static strenght (N)	Weight of 100 links (kg)	Connecting link	Plates colour outer-inner
420 MX	12.7	6.35	7.75	16.6	1.8/1.8	22000	0.89	CLIP	gold-black
428 MX	12.7	7.75	8.51	17.8	1.8/1.6	23000	1.05	CLIP	gold-black
520 EC	15.875	6.35	10.16	18.5	2.2/2.2	38000	1.62	CLIP	yellow-black
520 M	15.875	6.35	10.16	18.1	2.2/2	35000	1.51	CLIP	blue-yellow
520 MX	15.875	6.35	10.16	18.1	2.2/2	35800	1.51	CLIP	gold-black