The John Deere GY20629 Sheave is a genuine OEM replacement flat idler sheave designed to ensure proper belt tension and smooth operation of the mower deck on a wide range of John Deere lawn and garden tractors and zero-turn mowers. This durable component is a direct replacement for part number GY20073. It is compatible with numerous models including the 100, X300, and X500 Series Tractors, as well as various ZTrak Mowers. Engineered for precise fit and long-lasting performance, this sheave weighs approximately 0.0907 kg and measures 139.7 mm in length, 139.7 mm in width, and 25.4 mm in height.