SHIMANO Dura-Ace RD-7800 SS 10 speed Guide Pulley
Guide pulley for 10 speed Shimano Dura-Ace RD-7800 rear derailleurs. This is the top jockey wheel.
Complete with smooth rolling sealed cartridge bearings.
Manufacturer part number Y5V598070 (5V5 9807).
See exploded parts diagram for RD-7800.
See here for the matching tension (bottom) pulley.
As with any product, specification is subject to change without prior notification. You are advised to confirm current specification before buying.