10CNR  (RD15891  Idle Gear B (Large)

Genuine Shimano Idle Gear B Large (part #10CNR, RD15891) — this larger idle gear meshes with the primary drive components to transmit torque through the reel's gear train, delivering the smooth, powerful cranking that Shimano reels are known for. When the large idle gear strips or wears down, you will experience gear slippage, grinding under load, and a significant loss of retrieve power. Cross-references with Shimano part numbers 10CNR and RD15891. OEM replacement ensures perfect fit and factory performance. Available from Offshore Tackle & Repair in Stuart, FL — your trusted source for genuine Shimano reel parts.