A-iPower

AiPower 21" Self-Propelled RWD Walk Behind Mower with Aero Flow™ Deck

|115 ratings
Item # 990492355
Current price is $399.98
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Columbus, 43215
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Highlights

  • Briggs & Stratton EX550 Gas Engine with ReadyStart® technology 
  • 22” Steel with hardened 21” blade and Aero Flow™ technology
  • 1.85-Bushel wide-mouth opening for quick emptying
  • Comes fully assembled in the box, no assembly required
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4.1111 out of 5 stars
4.1111 out of 5 Stars. 18 reviews
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aipower 21" self-propelled rwd walk behind mower with aero flow™ deck three-quarter front view of black and red Briggs & Stratton–powered mower, 21" steel Aero Flow deck with hardened blade, rear-wheel-drive traction, 12" rear and 8" front wheels, single-lever deck height adjuster and rear collection bag; suitable for compact garage storage.
AiPower 21" Self-Propelled RWD Walk Behind Mower with Aero Flow™ Deck
Hero image 0 of AiPower 21" Self-Propelled RWD Walk Behind Mower with Aero Flow™ Deck, 0 of 14

About this item

Product details

The rear-wheel-drive self-propelled system dominates all lawns. Especially essential for yards with slopes and hills, the LM3N1-SPR-S maintains a consistent cut without any extra effort giving you more control during operation while increasing your safety. The 22” steel deck with Aero Flow™ technology provides superior grass clippings management. Easily adjust the deck height of all four wheels together with a single lever on the side of the deck. You can quickly and easily change the cutting options without tools: rear-bag capture of clippings, mulching, or side discharge. The durable 12” rear and 8” front wheels roll easily over all terrain. The quick-release levers allow the handle to adjust to different heights for customized comfort or fold for compact storage if desired. Experience a superior quality cut with reliable and durable performance from the LM3N1SPR-S mower season after season backed by a 2-Year Warranty.

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Key specifications

Specifications

  • Power: Briggs & Stratton EX550 Gas Engine with ReadyStart® technology
  • Deck: 22” Steel with hardened 21” blade and Aero Flow™ technology
  • Height Adjustment: Single Lever 6-position from 1.25" - 3.75"
  • Drive: RWD Self-propelled drive system
  • Cutting System: 3-in-1 rear bag, mulching, side discharge
  • Wheels: 12" Rear / 8" Front
  • Handle: Ergonomic adjustable height, folds for compact storage
  • Grass Bag: 1.85-Bushel wide-mouth opening for quick emptying
  • Included in box: Mulch kit, side-discharge chute, engine oil
  • Assembly: Comes fully assembled in the box, no assembly required
  • Warranty: 2-Year Warranty on engine and chassis

Member ratings & reviews

3.1 out of 5 stars
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115 ratings86 reviews
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  1. 5 stars38% (44)
  2. 4 stars7% (8)
  3. 3 stars11% (13)
  4. 2 stars10% (12)
  5. 1 star33% (38)
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Showing 1-3 of 86 reviews

Apr 24, 2026
Reviewer name: Fu
5 out of 5 stars
5 out of 5 stars review

An Excellent Lawn Mower

Delivery was very fast, I placed the order at Sam's and received it next day. It starts up with ease with first pull! The engine is powerful, handling even tall grass without any trouble at all. The self-propelled RWD feature makes mowing much easier. Highly recommended!

Helpful?5OLJNUS7ARVK18893671852
reply from DEE-Ontario Calif.

Hi Fu, thank you for your great review—we’re glad to hear your mower arrived quickly and is delivering strong performance, especially in taller grass. We appreciate your recommendation and hope it continues to serve you well. ~A-iPower Customer Support Team

Apr 30, 2026
Reviewer name: Ryan
5 out of 5 stars
5 out of 5 stars review

Great mower at a very stong pricepoint!

I really liked this mower. I was in the market and purchased it at Sam's Club because it was there and at a great price. I got it home, and the setup was pretty seamless. The mower has been great. It cuts well and seems very sturdy and well-built. Would definitely recommend to anyone in the market.

Helpful?5OLJNUS7ARVK18893671852
reply from DEE-Ontario Calif.

Hi Ryan, thank you for the awesome review! We’re glad to hear the setup was seamless and that the mower is delivering strong, reliable performance with clean cuts—that’s exactly what we aim for. We appreciate your recommendation and are here if you ever need anything down the line. ~A-iPower Customer Support Team

Apr 8, 2026
Reviewer name: Nathan
4 out of 5 stars
4 out of 5 stars review

Verified Purchase

Floods really easy

Ran into some issue early on with this mower. the engine floods really easy, but if you let is sit a bit it will start right up. Knowing that it runs great and handles my hilly yard like a champ.

Helpful?5OLJNUS7ARVK18893671852
reply from DEE-Ontario Calif.

Hi Nathan, thank you for your feedback—we’re glad to hear the mower performs well and handles your yard with ease. Flooding can sometimes occur if the choke or fuel system isn’t fully settling between starts, especially when the engine is still warm. If this continues, we’d be happy to help you troubleshoot and make sure everything is operating as it should—feel free to reach out to our support team anytime. ~A-iPower Customer Support Team

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