The Shimano Y3HM98010 is the genuine replacement tension and guide pulley set designed specifically for the Deore RD-M5120-SGS rear derailleur. This kit includes both the 11-tooth upper (guide) and 11-tooth lower (tension) pulley wheels, ensuring your drivetrain maintains its original shifting precision. Replacing worn pulleys is a cost-effective way to eliminate ghost shifting and reduce drivetrain noise.

These pulleys are engineered for use with 10 and 11-speed systems, featuring the durability and smooth rotation expected from Shimano's Deore line. The guide pulley is designed with specific lateral float to aid in crisp gear transitions, while the tension pulley maintains steady chain take-up. Keeping these components fresh prevents premature chain wear and ensures reliable performance on demanding trails.

Quick Facts

Feature	Specification
Compatibility	Shimano Deore RD-M5120-SGS
Tooth Count	11T (Upper) / 11T (Lower)
Drivetrain Speeds	10-Speed / 11-Speed
Material	High-Strength Composite
Weight	40.8g (Set)
Part Number	Y3HM98010