Grasscool D105 S100 D130 GY20850 Mulching 7 Star Mower Blades for John D-eere D110 D100 D125 E100 LA125 LA115 LA105 42'' Deck Zero Turn Lawn Tractor Riding GX22151

What It Is

These are aftermarket mulching blades designed for 42-inch cutting decks on John Deere lawn tractors and zero-turn mowers. The 7-star wing design lifts clippings for finer mulching, reducing bagging needs.

Fitment & Compatibility

• Deck size: 42-inch (measure your deck width—most common on D100, D110, D125, D130, E100, LA105, LA115, LA125 series).
• Fitment: Direct replacement for OEM part GX22151. Also fits Grasscool models D105, S100, D130, GY20850.
• Measurements: Blade length is 20.5 inches, center hole 1-inch diameter, 7-point star pattern. Check your current blade’s length and hole shape before ordering.
• Aftermarket note: Not OEM John Deere, but specifically designed to match specs. Verify your deck model (e.g., “42” stamped on deck) to avoid returns.

Key Things to Know

• Installation: Easy DIY—remove blade bolt (left-hand thread on some models), replace, and torque to 45-55 ft-lbs. No special tools beyond a socket wrench.
• Performance: 7-star design provides finer mulch than standard 2-blade sets, but may clog in wet grass—dry conditions recommended.
• Durability: Heat-treated steel, but aftermarket blades may dull faster than OEM. Inspect after 25 hours of use.
• Zero-turn compatibility: Works on 42-inch decks on select zero-turn models (e.g., Z225, Z245)—double-check deck size and spindle pattern.

Should You Buy It

If you own a 42-inch John Deere lawn tractor or zero-turn and want affordable mulching blades that perform well in dry conditions, these are a solid value. Avoid if you need OEM durability for frequent heavy-duty cutting or if your deck uses a different blade length or hole pattern.