Dreyoo 2 Pack 42" Lawn Mower Deck Belt Compatible with John Deere La100 La105 La110 Gx20072 Compatible with Cub Cadet, 1/2" x 104" Lawn Mower Deck Belt

What It Is

This is a 2-pack of 42-inch lawn mower deck belts, measuring 1/2” wide by 104” long. They are designed for residential riding mowers with a 42-inch cutting deck, commonly used on John Deere 100-series and select Cub Cadet models. The belts drive the mower blades from the engine pulley.

Fitment & Compatibility

Before buying, confirm three things: belt length, width, and cross-section shape. These belts are 1/2” x 104” with a standard V-belt profile. They are marketed as compatible with John Deere LA100, LA105, LA110, and GX20072, plus some Cub Cadet models. However, always check your owner’s manual or old belt for exact OEM part number. Common John Deere OEM numbers include GX20072 and M156333. For Cub Cadet, look for 954-04086A or 754-04086. These are aftermarket belts, not OEM, so fit may vary slightly on older or non-standard decks. Measure your existing belt end-to-end (not around pulleys) to verify 104” length. Also ensure your deck uses a 1/2” wide belt—some 42-inch decks use 3/8” or 5/8” belts.

Key Things to Know

• Quality vs OEM: Aftermarket belts often cost less but may wear faster or stretch more than OEM. This pack is budget-friendly, but expect shorter lifespan under heavy use.
• Installation difficulty: Moderate. You’ll need to remove the deck or at least the belt guard, route the belt around pulleys and idlers exactly as diagrammed. Take photos before removal.
• Common gotcha: The belt must be routed correctly around the deck’s tensioner pulley. Incorrect routing causes slipping or blade disengagement. Double-check your deck’s belt diagram.
• Two-pack value: If you have two identical mowers, or want a spare, this is convenient. But if you only need one, a single OEM belt may be simpler and more reliable.

Should You Buy It

Buy this if you have a 42-inch John Deere 100-series or compatible Cub Cadet, want a low-cost spare pair, and are comfortable with aftermarket belts that may need replacement sooner than OEM. Avoid if you need exact OEM fit for commercial use or have a non-standard deck that requires a specific belt profile.