CUB CADET 490-110-C139 Xtreme Blade Set 50" Deck Star Shape Center RZT LTX LGTX LGT 1050 S50 L50

What It Is

The Cub Cadet 490-110-C139 Xtreme Blade Set is a three-blade set designed for 50-inch cutting decks on select Cub Cadet zero-turn (RZT, LTX, LGTX) and lawn tractor (LGT) models. These are high-lift, star-shaped center hole blades intended for mulching and bagging heavy grass.

Fitment & Compatibility

Before buying, verify:

• Deck size: 50 inches only.
• Blade hole shape: Star-shaped center hole (not round or oval). Measure your old blade’s center hole – if it’s a 5-point star, these fit.
• Model series: RZT 50, RZT S50, LTX 1050, LGTX 1050, LGT 1050, LGT S50, and similar 50-inch deck models. Check your model number’s deck suffix (e.g., “-50” or “S50”).
• OEM vs. aftermarket: This is a genuine Cub Cadet OEM set. Aftermarket blades with star holes may not match the lift profile or balance.
• Length & width: Each blade is approximately 16.5 inches long (center hole to tip) and 2.5 inches wide. Measure your existing blade to confirm.

Pro tip: Look up your mower’s model/serial number on Cub Cadet’s site or in your manual. If your deck uses a different hole shape (e.g., oval or round), this set won’t work.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a torque wrench (recommended: 70-90 ft-lbs) and a blade removal tool. The star center hole can be tricky to align if the spindle shaft is worn.
• Performance: High-lift design improves grass discharge but increases engine load. Not ideal for dry, dusty conditions (can cause clumping).
• Durability: Mixed reviews – some report blades dull quickly on sandy soil or rocky terrain. Check for bent tips after heavy use.
• Balance: Uncommon but possible – balance the set before installing. An unbalanced blade can vibrate and damage spindles.
• Mulching kit required? These blades work with the factory mulching plug/cover but aren’t true mulching blades. For fine mulching, consider a dedicated mulching set.

Should You Buy It

Buy this set if you have a Cub Cadet RZT, LTX, or LGT with a 50-inch star-hole deck and need OEM-quality replacement blades for regular bagging or mulching. Skip it if your deck uses a different hole shape, you mow mostly dry/dusty grass, or you want a budget aftermarket option – the 3.6-star rating reflects some durability concerns for heavy-use yards.