GX21833 Lawn Mower Belt Replaces John Deere GX20571 D150 D160 L120 L130 145 155 fits Stens 265-238

What It Is

The GX21833 is an aftermarket lawn mower drive belt designed to replace the OEM John Deere GX20571 belt. It powers the mower deck on select John Deere lawn tractors and zero-turn mowers, typically used for residential mowing on lawns up to 2–3 acres.

Fitment & Compatibility

• Direct replacements: John Deere models D150, D160, L120, L130, 145, 155 (and some 100-series). Also equivalent to Stens 265-238.
• Measure before buying: Belt dimensions are 1/2" wide x 96" in circumference (actual length may vary ±0.5"). Measure your old belt or check your deck’s belt routing diagram.
• Check deck size: Fits 42" and 48" decks commonly found on those models. Not for 54" decks.
• OEM vs aftermarket: Aftermarket belt; may differ slightly in material or thickness from John Deere GX20571. Works fine for most users but may wear faster under heavy use.

Key Things to Know

• Installation difficulty: Moderate. Requires removing the mower deck, routing the belt around pulleys and idlers, and tensioning properly. A belt routing diagram (often under the seat or in the manual) is essential.
• Common gotcha: The belt can slip if the deck’s idler pulley or tensioner is worn. Replace worn pulleys at the same time for best performance.
• Quality: 4.4/5 rating from 278 reviews suggests reliable for typical residential mowing. Some reports of shorter lifespan than OEM under heavy or dusty conditions.
• Price vs OEM: At $13.99, it’s about 30–50% cheaper than a John Deere OEM belt. Good value if you’re not mowing commercially.

Should You Buy It

This belt is a solid, budget-friendly choice for homeowners with a compatible John Deere model who need a reliable replacement for occasional mowing. If you mow large areas weekly or in tough conditions (thick grass, hills), consider an OEM belt for potentially longer wear. Otherwise, this aftermarket option delivers good performance for the price.