(2) Super Turf Tire Assemblies 18x9.50-8 Fits Cub Cadet RZT 50" 54" 634-04128

What It Is

These are two complete 18x9.50-8 Super Turf tire assemblies designed for zero-turn mowers, specifically Cub Cadet RZT models with 50" or 54" decks. They replace worn or damaged drive tires that provide traction and support on turf without tearing up grass.

Fitment & Compatibility

• Deck size: Fits Cub Cadet RZT 50" and 54" models only.
• OEM part number: Replaces Cub Cadet 634-04128 (right side) and 634-04129 (left side). Check your mower’s model plate—these are not universal across all RZT series (e.g., RZT-S or RZT L models may differ).
• Measurements: Tire size 18x9.50-8 (18" tall, 9.5" wide, 8" rim diameter). Verify your current tires match these dimensions.
• Rim specs: 8" diameter, 5-bolt pattern with 4.5" center hole. Count your lug nuts and measure bolt circle before ordering.
• Aftermarket note: These are OEM Cub Cadet assemblies, not generic. If your mower is a different brand (e.g., Husqvarna, John Deere), they likely won’t fit without adapter plates.

Key Things to Know

• Quality: Super Turf tread is turf-friendly (low compaction) but less aggressive on slopes or wet grass than knobby tires. Good for flat, manicured lawns.
• Installation: Moderate difficulty. You’ll need a jack, socket set, and possibly penetrating oil for rusted bolts. No special tools for tire mounting—they come pre-assembled on rims.
• Common gotcha: The left and right assemblies are side-specific (valve stem orientation). Swapping them can cause clearance issues with the mower frame. Label them before removal.
• Weight: Each assembly is about 25 lbs. Expect shipping to be heavy—check for free delivery thresholds.

Should You Buy It

If your Cub Cadet RZT 50" or 54" has worn, cracked, or flat drive tires and you want a direct OEM replacement with proven turf-friendly tread, these assemblies are a solid choice. They’re not for aggressive terrain or non-Cub Cadet mowers, but for restoring traction and ride quality on a well-maintained lawn, they deliver.