100XM (RD21090 Pinion Bushing)

Genuine Shimano Pinion Bushing (part #100XM) — the pinion bushing supports the pinion gear shaft, reducing friction and maintaining proper alignment between the pinion and drive gear. A worn pinion bushing causes excessive play in the gear train, resulting in a sloppy feel, gear noise, and accelerated wear on both the pinion and drive gears. Cross-references with Shimano part number RD21090. OEM replacement ensures perfect fit and factory performance. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano reel parts.