Shimano LX RD-M581 Rear Derailleur has the Top-Normal design (traditional) swing. Designed for all Mega drivetrain. All alloy and great looks. Wide link design for more rigidity and precise shifting Capacity: 45T

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Specifications:

Pulley Cage GS/SGS

Speeds -- 9

Spring Type -- Top-Normal

Max Front --Difference 22T

Total Capacity -- 33T/45T

Max Rear Sprocket -- 34T

Min. Rear Sprocket -- 11T

Direct Attachment -- Yes

Fluoric Coated

Link Bushings

11T Pulley

Bracket Body -- Material/Finish Aluminum/Painted

Plate Body -- Material/Finish Aluminum/Painted

Outer Link -- Material/Finish Aluminum/Painted

Inner Link -- Material/Finish Steel/Painted

Outer Plate -- Material/Finish Steel/Painted

Inner Plate -- Material/Finish Steel/Painted