8TEN Drive Belt for Ariens Gravely Zoom 50 ZT50 Cub Cadet RZT-S50 50-Inch Deck 07200524 954-04330 1/2" x 138"

What It Is

This 1/2" x 138" drive belt transfers power from the engine pulley to the mower deck blades on 50-inch deck zero-turn mowers. It’s a direct replacement for Ariens, Gravely Zoom 50, and Cub Cadet RZT-S50 models.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Must be exactly 50 inches (not 46" or 54").
• Model series: Fits Ariens Zoom 50 (2012–2017), Gravely Zoom 50 (2012–2017), and Cub Cadet RZT-S50 (all years). Not for RZT-50 without the “S” (different belt length).
• OEM numbers: Cross-references to Ariens/Gravely 07200524 and Cub Cadet 954-04330. If your machine uses a different OEM number, the belt length (138") or width (1/2") likely won’t match.

Measure your old belt end-to-end (not around pulleys) to confirm 138 inches. A 1/2" width is standard for these decks—a 5/8" belt will not fit the pulleys.

Key Things to Know

• Quality: 8TEN belts are aftermarket, not OEM. Users report they match OEM dimensions but may have slightly shorter lifespan than factory belts under heavy use.
• Installation: Moderate difficulty. You’ll need to release the deck tensioner with a wrench or socket—no special tools required. Expect 20–30 minutes for a first-time swap.
• Common gotcha: The belt routing diagram on some decks is wrong for this belt. Double-check routing by tracing the old belt before removing it. A mis-routed belt will slip or throw off the deck.
• Check pulleys: If your old belt frayed or snapped, inspect all deck pulleys for damage or wobble before installing the new belt. Bad pulleys will ruin this belt quickly.

Should You Buy It

If you need a reliable, budget-friendly replacement for a 50-inch Ariens, Gravely, or Cub Cadet RZT-S50 deck and you’re comfortable with basic wrench work, this belt is a solid choice. Avoid it if you want OEM longevity or if your deck has damaged pulleys—fix those first.