10BYQ (RD15839 Pinion Gear)

Genuine Shimano Pinion Gear (part #10BYQ) — the pinion gear meshes with the drive gear to transfer cranking power from the handle to the rotor, driving the retrieve. Worn or chipped pinion gear teeth cause grinding, rough cranking, and eventual gear failure under heavy drag loads. Cross-references with Shimano part number RD15389. OEM replacement ensures precise tooth engagement and silky-smooth retrieve performance. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano spinning reel parts.