Upgrade 21 Inch AB2100 Lawn Mower Blade (3 Pack),Replace for 3705938001,Compatible with geo Power+ 56V Models LM2100 LM2101 LM2100SP LM2102SP
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🛒 See Price on AmazonWhat It Is
This is a 3-pack of 21-inch replacement blades designed for electric lawn mowers, specifically the Greenworks/Geo Power+ 56V models. It’s a direct aftermarket upgrade for OEM part 3705938001, intended for mulching, bagging, or side-discharge cutting on residential lawns.
Fitment & Compatibility
Before buying, measure your existing blade length—it must be exactly 21 inches end-to-end. Check the center hole diameter (typically 5/8-inch on these models) and the offset/airlift shape to match your deck. This pack fits Geo Power+ 56V models LM2100, LM2101, LM2100SP, and LM2102SP only. It replaces OEM part 3705938001 but is not made by Greenworks. Confirm your mower’s deck is 21 inches and that the blade’s mounting pattern (usually a single center bolt) matches yours. If your mower uses a different spindle or a star-shaped hole, this won’t work.
Key Things to Know
- Quality variance: At 3.8 stars with only 14 reviews, expect inconsistent sharpness out of the box—some users report needing to sharpen before first use.
- Installation is straightforward: Use a socket wrench to remove the center bolt (left-hand thread on some models—turn clockwise to loosen). Torque to 35-45 ft-lbs when reinstalling. Wear gloves.
- Balance check recommended: Aftermarket blades can be unbalanced. Test by hanging the blade on a nail—if one side dips, file the heavy side until it hangs level. An unbalanced blade will vibrate and damage the spindle.
- Durability: These are likely stamped steel, not hardened. They’ll dull faster than OEM if you hit rocks or thick grass frequently.
Should You Buy It
Buy this 3-pack if you need a budget-friendly spare set for a Geo Power+ 56V mower and don’t mind checking balance and sharpening before use. Skip it if you want guaranteed fit, longer edge life, or if your mower uses a different blade pattern—stick with OEM or a reputable aftermarket brand with more reviews.
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