---
title: "Greenworks 21 Inch Mower Blade — $67K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/patio-lawn-garden/greenworks-21-inch-mower-blade"
last_updated: "2026-08-10T22:55:19.901Z"
locale: en
meta:
description: "Niche score 55/100 · $67K/yr market · 46K searches/yr · $25.63 avg price. A small market ($67K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 55/100 · $67K/yr market · 46K searches/yr · $25.63 avg price. A small market ($67K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Greenworks 21 Inch Mower Blade — $67K/yr Amazon US Niche (2026) - Flapen"
---
# **greenworks 21 inch mower blade**
**Worth a look**
Shows demand growing +173.5% this quarter, but a small market ($67K/yr) keeps it on the watch list.
Market size 17Growth 97Conversion 64Competition 27Returns 74Price range 95Avg price 95Brand share 31Review moat 71Quality gap 45
**Growth**
**Incredible****+173.5%**
90-day search growth — must beat 0% to launch
**Avg price**
**Incredible****$25.63**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$15.64–$38.42**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Good****2.1%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****652.94**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Good****5.7%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****87%**
top-5 brand share — brands hold most of the demand
**Competition**
**Okay****69%**
top-5 click share — leaders hold, buyers still browse
**Market size**
**Bad****$67K**
$67K/yr · 46K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)")
According to Flapen's Amazon United States niche tracking, greenworks 21 inch mower blade is a $67K/yr Amazon United States market (46K searches/yr). The top 5 brands hold 87% of demand. Demand peaks in Apr–May–Jun–Jul–Aug. Verdict: Worth a look — 55/100.
Data updated Jul 16, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **greenworks 21 inch mower blade market data**
- **Units sold / yr**
- **3K–3K**
- avg 100–250/product
- **Revenue / yr**
- **$64K–$77K**
- units × avg price
- **Conversion rate**
- **5.7%**
- **Avg BSR**
- **#610**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **65%**
- **Out of stock**
- **2.9%**
- **Avg brand age**
- **39 months**
- **Avg seller age**
- **158 days**
## **Competition & brand share**
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**10 **▲rising
**Sellers**
**17**
**Top-5 brand share**
**87%**
Top 20: 100%
**Top-5 click share**
**69%**
Top 20: 100%
**Open market**
**9%**
- Greenworks55% - Fismiuta11% - SWAPARTS8% - Wadoy7% - GICOOL7% - DAOLONG5% - Open — no brand owns it (4 brands, 9%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +173.5% search growth over the last 90 days.
2K2KSpike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay
Peak months: Apr, May, Jun, Jul, Aug · busiest ÷ quietest = 18.1×
[**Open Trend **](https://flapen.com/research/us/patio-lawn-garden/greenworks-21-inch-mower-blade/trend)
## **Top greenworks 21 inch mower blade search terms**
- **greenworks 21 inch mower blade**12K/yr+168.0%9.8% conv. - **greenworks lawn mower blade**9K/yr+180.5%5.3% conv. - **greenworks mower blade**8K/yr+239.7%4.4% conv. - **kobalt 21 inch mower blade**6K/yr+169.7%4.4% conv. - **greenworks blade**3K/yr+159.1%2.9% conv. - **greenworks replacement blade**3K/yr+164.5%4.5% conv. - **greenworks blade replacement**3K/yr+136.4%3.9% conv. - **greenworks lawn mower blades**2K/yr+101.3%2.7% conv. [**All search terms **](https://flapen.com/research/us/patio-lawn-garden/greenworks-21-inch-mower-blade/search-terms)
## **Top greenworks 21 inch mower blade products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$7K20%$13K30%$20K40%$27K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 17 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Greenworks Replacement Lawn Mower Blade (21 Mowers : MO40L4413 MO40L03 MO48L4422)**Greenworks**$24.72**4.6★376 rev](https://www.amazon.com/dp/B0B78JZGVS) [2**Greenworks 2905203 Blade for 21 Mower Black**Greenworks**$22.27**4.7★139 rev](https://www.amazon.com/dp/B0C2ZD79J9) [3**Fismiuta 21 inch Lawn Mower Blade Compatible with Greenworks 21 Deck Mower Circle Mulching Replacement Lawn Mower Blade Replacement Model MO40L03 MO48L4422 MO40L4413**Fismiuta**$22.51**4.5★45 rev](https://www.amazon.com/dp/B0GHRLNSSR) [4**SWAPARTS Lawn Mower Blade for Greenworks 21 inch Mower C3208101 MO40L4413 MO40L03 MO48L4422**SWAPARTS**$21.13**4.5★522 rev](https://www.amazon.com/dp/B0CT8LKWZG) [5**GICOOL 1-Pack 21 Lawn Mower Blade Compatible with Greenworks 21 Deck Mower Replaces Models MO40L03 MO48L4422 MO40L4413**GICOOL**$21.49**4.3★43 rev](https://www.amazon.com/dp/B0G2KVMNCX)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**21 Inch Mower Blade 2 Pack Lawn Mower Blade Compatible with Greenworks 21 inch Mower Blade Fits MO40L03 MO48L4422 MO40L4413 C3208101 Lawn Mower Heavy Duty Sharp Replacement Blade**DAOLONG**$35.24**15 rev3mo ago](https://www.amazon.com/dp/B0GRG45SZ9) [**Sthovd MO48L4422 Lawn Mower Blade Compatible with Greenworks 21 inch**Sthovd**$19.65**5 rev3mo ago](https://www.amazon.com/dp/B0GWDHYPLN) [**Wadoy Lawn Mower Blade 2 Pack Compatible with Greenworks 21 Inch Replacement Part for MO40L03 MO48L4422 MO40L4413 C3208101 Green Color**Wadoy**$35.85**103 rev3mo ago](https://www.amazon.com/dp/B0GVJH1RY5) [**Dichallu 21 inch Mower Replacement Blade for Kobalt/Greenworks C3208101 MO40L4413 MO40L03 MO48L4422 (Black 2 Pack)**Dichallu**$36.53**7 rev5mo ago](https://www.amazon.com/dp/B0GLQGXFT9) [**Fismiuta 21 inch Lawn Mower Blade Compatible with Greenworks 21 Deck Mower Circle Mulching Replacement Lawn Mower Blade Replacement Model MO40L03 MO48L4422 MO40L4413**Fismiuta**$22.51**45 rev5mo ago](https://www.amazon.com/dp/B0GHRLNSSR)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**25322 25242 16 inch Lawn Mower Blade Compatible with Greenworks 16 Corded Mower Circle Mulching Lawn Mower Blade Replacement Part 33303488 29512 for Greenworks**Fismiuta**$20.99**4.5★**▲ 93%**](https://www.amazon.com/dp/B0GHRHDTVK) [**Sthovd MO48L4422 Lawn Mower Blade Compatible with Greenworks 21 inch**Sthovd**$19.65**3.9★**▲ 92%**](https://www.amazon.com/dp/B0GWDHYPLN) [**21 Inch Mower Blade 2 Pack Lawn Mower Blade Compatible with Greenworks 21 inch Mower Blade Fits MO40L03 MO48L4422 MO40L4413 C3208101 Lawn Mower Heavy Duty Sharp Replacement Blade**DAOLONG**$35.24**4.7★**▲ 92%**](https://www.amazon.com/dp/B0GRG45SZ9) [**Wadoy Lawn Mower Blade 2 Pack Compatible with Greenworks 21 Inch Replacement Part for MO40L03 MO48L4422 MO40L4413 C3208101 Green Color**Wadoy**$35.85**4.6★**▲ 91%**](https://www.amazon.com/dp/B0GVJH1RY5) [**Dichallu 21 inch Mower Replacement Blade for Kobalt/Greenworks C3208101 MO40L4413 MO40L03 MO48L4422 (Black 2 Pack)**Dichallu**$36.53**4.8★**▲ 91%**](https://www.amazon.com/dp/B0GLQGXFT9)
**~~View all trending →~~**
## **What buyers say about greenworks 21 inch mower blade**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**34%
*“Fits great”*
**Cutting/Trimming**18%
*“Cuts Grass Great”*
**Quality-Overall**8%
*“The quality feels solid”*
**Assembly/Installation**8%
*“Easy to install”*
**Value For Money**7%
*“Worth the money”*
**Advertised Vs Actual Product**6%
*“Just as described”*
**Ease Of Use**4%
*“ready to use”*
**Durability**4%
*“Build quality feels solid and durable, especially for the price”*
**Strength**1%
*“Strong, sharp and as good or better than the mower manufacturer's blade”*
**Material Quality**1%
*“It feels solid, well-made, and balanced”*
### **What buyers complain about **
**Size-Overall**19%
*“it was actually an inch short”*
**Advertised Vs Actual Product**8%
*“The profile is also slightly different”*
**Shape/Style**5%
*“a bit different shape from Greenworks 333041179”*
**Value For Money**4%
*“Costs More Than OEM Blade”*
**Weight Heavy**4%
*“The blade is slightly heavier”*
**Thickness**4%
*“Kinda thin”*
**Quality-Overall**4%
*“Not as good as the original”*
**Motor Issues**3%
*“This blade slowed down my electric mover by like 30-40 percent”*
**Grip**3%
*“however my concern is slipping”*
**Color**3%
*“These are all-black, not green”*
### **Top return reasons **
**Size-Overall**63%
**Advertised Vs Actual Product**14%
**Mounting**11%
**Defective Material/Parts**2%
**Value For Money**2%
**Functionality-Overall**1%
**Shape/Style**1%
**Assembly/Installation**1%
**Add-Ons/Attachments**1%
**Cutting/Trimming**1%
## **Common questions**
- **Is greenworks 21 inch mower blade profitable to sell on Amazon United States?**
- The niche generates $67K/yr across 17 tracked products. 2 of 8 products launched in the last 360 days are still selling. 90-day search growth is +173.5%. Flapen's verdict: Worth a look (55/100).
- **How competitive is the greenworks 21 inch mower blade niche?**
- 10 brands and 17 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 87% of demand.
- **What do buyers complain about in greenworks 21 inch mower blade?**
- Top complaints mined from reviews: Size-Overall, Advertised Vs Actual Product, Shape/Style. The return rate is 2.1%.
- **When does demand for greenworks 21 inch mower blade peak?**
- Demand peaks in Apr–May–Jun–Jul–Aug; the busiest month runs 18.1× the quietest.
- **What does it cost to enter the greenworks 21 inch mower blade niche?**
- Listings span $15.64–$38.42; the average listing price is $25.63 (sweet spot $15–$100). The average incumbent carries 653 reviews — the moat a new listing must climb.
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