BOLD MAGENTA part numbers are new for 2025 CHAINS PARTS-UNLIMITED.COM OFFROAD | 2025 CHAINS 729 NO. OF LINKS COLOR PART # 116 Gold 1221-0116 NO. OF LINKS COLOR PART # 120 Gold 1221-0117 NO. OF LINKS COLOR PART # Clip connecting link Gold 1225-0255 520MXR 3D CHAINS •Precise forging process leads to a stiff chain for better acceleration and more efficient engine work •Lightening hole allows for a lighter chain without compromising strength while removing mud and dispersing heat more efficiently •Improvement in transmission efficiency •Special pins with holes in both ends allow the chain to be lightened •Edge-cut inner plate reduces friction and allows for smooth engagement with sprocket •Non-sealed to reduce as much friction as possible •Chromium carbide pin surface coating increases hardness and reduces chain wear •Tensile strength of 8,655 lbs. •For use with 125 to 500cc motocross bikes NO. OF LINKS COLOR PART # 120 Gold 1222-0603 NO. OF LINKS COLOR PART # Clip connecting link Gold 1225-0641 520M3 CHAIN •Precise forging process leads to a stiff chain for better acceleration and more efficient engine work •Lightening hole allows for a lighter chain without compromising strength while removing mud and dispersing heat more efficiently •Non-sealed to reduce as much friction as possible •Chromium carbide pin surface coating increases hardness and reduces chain wear •Tensile strength of 8,230 lbs. •Maximum engine size: 450cc •Includes clip-type connecting link NO. OF LINKS COLOR PART # 120 Gold 1223-0555 520SM CHAIN •Precise forging process leads to a stiff chain for better acceleration and more efficient engine work •Lightening hole allows for a lighter chain without compromising strength while removing mud and dispersing heat more efficiently •Improvement in transmission efficiency •Special pins with holes in both ends allow the chain to be lightened •Edge-cut inner plate reduces friction and allows for smooth engagement with sprocket •Tensile strength of 8,900 lbs. •Designed for 250 to 650cc enduro and supermoto bikes
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