SHIMANO Dura-Ace RD-7800 SS 10 speed Tension Pulley
Tension pulley for 10 speed Shimano Dura-Ace RD-7800 rear derailleurs. This is the bottom jockey wheel.
Complete with smooth rolling sealed cartridge bearings.
Manufacturer part number Y5V598090 (5V5 9809).
See exploded parts diagram for RD-7800.
See here for the matching guide (top) pulley.
As with any product, specification is subject to change without prior notification. You are advised to confirm current specification before buying.