John Dee re GX21784 GY20852 AM141035 GX21786 Toothed Mulching Blade Compatible with 48 inch John Dee re D140 E140 LA145 D160 S170 E170 E160 Z355E D155 Z255 LA130 Deck Lawn Mower (3pack)

What It Is

This is a 3-pack of toothed mulching blades designed to fit 48-inch cutting decks on select John Deere lawn tractors and zero-turn mowers. The “toothed” edge chops clippings finer than standard blades, improving mulching performance and reducing bagging frequency.

Fitment & Compatibility

Check your deck size first: This blade is made for 48-inch decks only. Confirm your mower’s deck measures 48 inches deck to deck.

Model cross-reference: Compatible with John Deere D140, E140, LA145, D160, S170, E170, E160, Z355E, D155, Z255, and LA130. Also replaces OEM part numbers GX21784, GY20852, AM141035, and GX21786.

Measurements: Blade length must match your original—typically 20.5 inches for these decks. Verify the center hole diameter (usually 7/8-inch or 1-inch) and the offset/angle to ensure the blade sits flat.

OEM vs aftermarket: This is a non-OEM blade. It often works fine, but check that the mounting holes align and the blade isn’t significantly thicker or thinner than the original, which can affect balance and spindle wear.

Key Things to Know

• Installation difficulty: Easy—requires a socket wrench and a blade removal tool or block of wood. Torque to spec (typically 70–90 ft-lbs) to avoid loosening during use.
• Quality notes: These blades are generally well-reviewed for durability and sharpness, but inspect for burrs or uneven edges out of the box. Sharpening may be needed sooner than OEM.
• Common gotcha: The toothed design can create more vibration if the blade is slightly unbalanced. Always balance after installation using a blade balancer.
• Deck fit: Ensure the blade’s lift wings (if any) match your deck’s airflow pattern—incorrect lift can reduce bagging or cause clumping.

Should You Buy It

If you own one of the listed 48-inch John Deere models and want a budget-friendly mulching upgrade, this 3-pack is a solid value. It’s best for homeowners who mow weekly and prefer fine mulching over bagging. Avoid if you need exact OEM fit or run a commercial operation where blade balance and longevity are critical.