21 Inch Mulching Mower Blades, Replaces 89914P, 133-8182-03, 109-0854, 108-0954-03, Compatible with to ro Super Rec ycler, Ex Mark, Law nBoy 21 Inch Mower (2PCS)

What It Is

This is a set of two 21-inch mulching blades designed for high-end residential and commercial walk-behind mowers. They are intended for mowers that require a finer cut and grass recycling, not side-discharge or bagging blades.

Fitment & Compatibility

Before buying, confirm your deck is exactly 21 inches wide (measure the blade tip-to-tip path, not the deck shell). These blades replace OEM part numbers 89914P, 133-8182-03, 109-0854, and 108-0954-03. They fit specific Toro Super Recycler, Exmark, and Lawn Boy 21-inch mower models—not all 21-inch decks. Check the blade’s center hole size (typically 5/8 inch) and overall length (21 inches). Measure your current blade’s length and hole diameter; if either differs, these will not mount correctly. Also verify the blade’s offset and lift—mulching blades are typically more curved than standard blades, so they must match your mower’s spindle height.

Key Things to Know

• Material quality: These are likely stamped steel, not heat-treated or hardened like OEM. Expect shorter edge life, especially in sandy or rocky conditions.
• Installation difficulty: Easy if you have a socket wrench and blade removal tool. Torque to manufacturer spec (usually 40–60 ft-lbs). Always disconnect the spark plug.
• Balance check: Aftermarket blades often need balancing before use. Use a blade balancer—an unbalanced blade will vibrate, damage the spindle, and leave an uneven cut.
• Mulching performance: They should produce fine clippings if used on dry grass and at proper mowing height. Wet or tall grass will still clump.

Should You Buy It

Buy these if you need a budget-friendly replacement for a Toro Super Recycler, Exmark, or Lawn Boy 21-inch mower and don’t mind replacing blades more often than OEM. Avoid if you mow professionally or in rocky terrain—invest in OEM or hardened aftermarket blades for longer life and less vibration.