splash image
    • Classic LM 21S - 911193
      Classic LM 21S - 911193
    • Classic LM 21SW - 911194
      Classic LM 21SW - 911194
  • ​You will comfortably roll right along with this walk behind mower…thanks to an ergonomically designed multi-position handlebar that reduces wrist and hand fatigue…use the adjustment brackets to easily dial in one of six cutting heights for a professionally manicured look…to keep you rolling…the mower’s baked-on powder coated finish resists the effects of moisture, fertilizers and chemicals for years of reliable performance…it’s all right here…to dependably cut all your grass out there.​

    • Live Chat

      Chat with a member of our support team.

      Monday - Friday: 8:00AM - 4:00PM CDT
      Saturday - Sunday: Closed

      Live Chat
    • Ask a Question

      Submit a question to our support team.

      Ask A Question
Scroll to view more
3 Model(s) Classic LM 21 Classic LM 21 SW Classic LM 21 S
3.66 of 5 (120 Reviews)
4.07 of 5 (14 Reviews)
4.41 of 5 (27 Reviews)
Classic LM 21Classic LM 21 SWClassic LM 21 S
Cutting Width
Cutting Height
1" - 3.25"1" - 3.25"1" - 3.25"
Cut Positions
Engine Brand
Kohler® XT-7.75Kawasaki® FJ180VKawasaki® FJ180V
Engine Power
173 cc179 cc179 cc
Drive Type
PushInfi-speed® Variable speed drive - Disc-O-MaticInfi-speed® Variable speed drive - Disc-O-Matic
Fuel Tank Capacity
0.37 Gallon (1.4L)0.53 Gallon (2L)0.53 Gallon (2L)
Ground speed
N/A4 mph4 mph
Deck Material
14 ga14 ga14 ga
Deck Construction
Product Warranty
3-year Limited Consumer
3-year Limited Consumer
3-year Limited Consumer
  Classic LM 21 Classic LM 21 SW Classic LM 21 S
Scroll to view more
Rated 3.7 out of 5 by 120reviewers.
Rated 5 out of 5 by 12 years old and still running strong I both this when I moved from a house that had a larger yard (had a rider) to a smaller yard. My primary reason for purchasing this mower (Scotts brand for Home Depot) was the overall design and specifically the front swivel wheels. Outside of normal maintenance and a replacing a few parts this mover still is running strong. A testimony to the quality products Areins puts out. I'd recommend this mower to anyone looking for a durable mower. August 9, 2013
Rated 5 out of 5 by A+ product my first Ariensused products on golf course years agowish I had bought one sooner! June 17, 2013
Rated 5 out of 5 by Replaces our old Ariens mower Great mower, just like the old 20+ yr old one we had June 13, 2013
Rated 5 out of 5 by Great mower, has 6-HP Kawasaki motor & swivel front wheels My last mower was a commercial grade mower with a 5 hp Kawasaki motor and lasted 19 years. So, when I retired it, I wanted another commercial grade mower with a Kawasaki motor. I could not find one anywhere locally, but found an Ariens mower that had everything I needed online at The Ariens Classic LM21SW (21") 6-HP Self-Propelled Lawn Mower w/ Swivel Wheels is powerful, very manuverable around flower beds and simply a pleasure to use. My wife laughed at me when I first used it, because I was smiling from ear to ear and looked liked I was actually having fun cutting the grass. June 22, 2012
Rated 5 out of 5 by Great Mower Started using this mower this spring. My model has the Honda motor and it starts easily on the first pull. I like that it has the mulch, bag and side discharge features. Since I'm tall, the self propell feature is a bit slow for me, but overall thats a non issue. So far this is the best walk behind I've owned. Extremely satisfied with my purchase. June 18, 2012
Rated 5 out of 5 by Well designed Purchased on sale, it was a great value compared to other models.It starts easily. Both my son and I use it without issue. My son cut grass for a professional landscaper and prefers this mower over the commercial products. He likes the capacity of the bagger attachment and the power of the discharge.Easy to push and to make height adjustments. One of the nicest mowers I have ever used. June 15, 2012
Rated 5 out of 5 by Great Value & Durable I bought mine (with the Kohler engine) last year from Home Depot. The price was as expected for a quality mower such as this one. It runs great - still like new! June 15, 2012
Rated 5 out of 5 by A GREAT MACHINE It's a great mower, cuts evenly over a rough lawn. Easy on gas. The self propper feature is quit hand while cutting the ditches. The mower is still light enogh to push without having to engage the self self propulsion. Overall I'm more than happy with my purchase. June 15, 2012
Rated 5 out of 5 by Best Lawn Mower I have ever owned! I am very happy with my purchase of an Arien product. June 15, 2012
Rated 5 out of 5 by Ariens...Woot! This machine works great. It starts everytime on the first pull. It cuts even, and makes my lawn look very professional. Thank you neighbors are jealous!I wish this had dual speeds.I also own a 1979 Snowblower, and starts within the 2nd pull each year I start it up! June 14, 2012
  • 2015-08-03T06:32:14.693-05:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_120, tr_120
  • loc_en_US, sid_Classic LM21, prod, sort_default
2 3 4 5... 12next>>
Rated 4.1 out of 5 by 14reviewers.
Rated 5 out of 5 by Classic LM SW I purchased this mower this spring(2015) because I have 2 acres in a somewhat hilly section of eastern West Virginia. I had owned a Toro 30" big mower. It was underpowered and just didn't do the job. However, my Ariens is just great. The mulcher part is good also! This mower has power and cuts really clean. The swivel front wheels allow me to get around the large number of trees on my property. This mower is as advertised. Just buy it and use it! You won't need another one! Sturdy and dependable! July 26, 2015
Rated 5 out of 5 by Great mower will built. This mower is the best that I ever had and will tell all about how well it works. I should have got it sooner to save me alot of stress and work cutting my lawn. Hope to use it for a long time and how it is built I think it will be so. June 15, 2012
Rated 5 out of 5 by I AM VERY HAPPY WITH MY LM21SW This mower is everything that i wanted. I amvery happy with the features and performance. Very durable and easy to use. I also own a ariens snowblower and i am also very happy with it. keep up the good work. My dealer Quincy small engine repair is very good and professional and very easy to deal with. service is prompt and reliable. June 13, 2012
Rated 5 out of 5 by This is the best mower I have ever owned! Great suction for leaves and debris. Never had a self-propelled lawnmower before this is great! The swivel wheels get around my trees with ease. sturdy, heavy, great paint job. I love the speed control. This is a very impressive machine. Going on my second season, and look forward to many more. June 12, 2012
Rated 5 out of 5 by This is a thumbs up quality mower. Mower was easy to set up and operate. I especially love the swivel front wheels. I am 74 yrs. young and have no problem handling this mower. Hope to do it another 20 yrs. June 12, 2012
Rated 5 out of 5 by LM21SW This is a good one. I just got it and ran out to mow the lawn. That swivel wheel thing takes a little getting use to but once you get it down you're zipping around the yard. I found one nut I had to tighten and I'm going to have to adjust the speed control so it will stay where I put it but add gas and one pull is all it needed. It's a good strong drive and on slow, it is really slow to get around trees with out running, then faster for straight runs. Top speed is too much for me but it's there if you need it. No mention in the manual about a part number for the oil filter. ??? The handle has adjustments for tall people like me too. No more bending over all the time. Big wheels give it a better ride on my rough ground. You don't have to put anything together but you do have to go over all the adjustments and check all the bolts and nuts. I found a few loose. If you are thing about this one and aren't sure because of the higher price, all I can say is you get what you pay for and you get it with this mower. May 25, 2012
Rated 4 out of 5 by Versatile and durable The Veterans Cemetery I work at owns 2 of these machines. The swiveling front wheels make it very easy to maneuver, and the speed adjustment makes it easy for any of my staff to operate the mowers comfortably.The overall features and construction are very high quality. We have had a couple of issues losing the keepers from the height adjustmant pins on the front wheels, but overall are very happy with the performance of these mowers.After 2 years using them, I am impressed enough that when my home mower finally wears out, I am planning on getting one of these for myself. August 9, 2012
Rated 4 out of 5 My second Ariens Classic. Used the first for 25 years. Bought my first Ariens classic mower around 1986 and used it until 2011. Replaced the engine and transmission wheel one time.Bought a new Ariens classic with the swivel wheels. Basically the same mower with the Kawasaki engine. Engine is much more powerful than the old Tecumseh but is seriously heavier. I have a sloped yard and this mower wants to go down hill sideways on the steepest of the slopes. Also, tires are not wide enough to support the weight of the engine. I would have expected the design engineers at Ariens to know better than to bolt a big engine on the same frame and drive train.Never the less, I would probably buy this mower again. It's still a great mower. June 12, 2012
Rated 4 out of 5 LM21 SW This is the second Ariens product I have purchased (I also own an Ariens Snow blower), and I am very happy with both. The mower starts on the first pull every time, and the rear bagging system works great. The last mower I had left clippings all over, due to the fact that the bag would get clogged up, not the case with this one. June 12, 2012
Rated 4 out of 5 by Heavy, durable mower. Engine is better than the mower itself I’m in my second season with this mower. I think this mower will hold up for many years, but have noted some improvement needs from such a high end mower.Pros-Kawasaki engine is very reliable. Starts every time with a gentle pull.-swivel wheels make turning and curves a breeze, engaging/disengaging is simple-folding handle is quick and easyCons-self propel speed control does not stay in place even after tightening-expected more power from the self propel, doesn’t do well on hills or uneven surfaces.-bag attachment caused paint chips after one season June 12, 2012
  • 2015-08-03T06:32:30.292-05:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_14, tr_14
  • loc_en_US, sid_Classic LM21 SW, prod, sort_default
Rated 4.4 out of 5 by 27reviewers.
Rated 5 out of 5 by Great lawn mower!! Heavy duty mower. Cuts beautifully. Kawasaki engine starts if you just look at it!! Love it. Highly recommended.... June 14, 2013
Rated 5 out of 5 What I wanted! Works the balls! Tilled a new garden out of tough grass and soil in no time! June 13, 2013
Rated 5 out of 5 by Great machine my 2nd one Very durable machine we mow 20 yards per day both machine operate as good as the day I bought them one 2 years ago the other this year considering purchasing the 3rd one. Variable,speed transmission is awesome easy to adjust Easy to start even in cold weather June 13, 2013
Rated 5 out of 5 by Reliable The first time i went to use this mower this year (2013) it started with the first pull. June 13, 2013
Rated 5 out of 5 by I love my Ariens walk behind zero-turn/pivot front wheels I was so impressed with how well I liked my Ariens snow blower, that I had to try their walk behind mower and boy! This is a sweet machine! It's built to last in WI with the quality I associate with Ariens and the Kawasaki engine is so quiet, smooth, powerful and easy to care for. One prime, one pull, starts every time!!I have nearly an acre of sod on a hilly 2.5 acre lot with several gardens, trees and septic pipes to edge. I enjoy trimming around these before getting out the rider and I was tired of how poorly other brands worked with their fixed wheels, chewing up my lawn around the smaller radius pipes and trees. That's why I wanted the swivel wheels from Ariens. The mower works like a charm and gives me a wonderful cut or mulch.The infinitely variable speed control and differential rear wheels gives me a wonderful variety of options, if I decide to walk mowing the lawn vs. the rider for a little extra exercise doing the yardwork:) Ariens installed large diameter rears with smaller front wheels and I have no problems getting into small areas and still have the comfort from the bigger wheels. Note, this machine is *heavy*, but with the beautifully adjustable drive system that Ariens put on this, it's no problem to maneuver.If I have *any* complaints, they are minor for me, one is that adjusting the front wheels requires you to remove a cotter pin and two is to change from a side discharge chute to the mulch shield needs a wrench or socket driver. These are minor and I don't change them very often, so if you find that you like to adjust these during a mowing session, you won't like how it's done on this machine.I haven't used the bagging system for my Ariens LM21, because of the size of my lawn. If I decide to bag my lawn clippings, I'll use the side discharge on my Ariens during my trimming and bag everything with my riding mower.Bottom line, this is the *best* walk behind mower that I've ever used in 40 years and I love it! I have no reservations in recommending it. June 13, 2013
Rated 5 out of 5 by I only push a Ariens around my lawn. In 40 years I have had 3 LS21's. This should be my last one. June 13, 2013
Rated 5 out of 5 by Classic LM 21 S Great machine I would not own any other Brand, only draw back is it is slightly heavier then the Model before other than that Just Great. June 13, 2013
Rated 5 out of 5 by Great Mower Second ariens mower last one went 15 years, only mower that vacuums like an ariens! June 13, 2013
Rated 5 out of 5 by Excellent design This is my second Ariens with turning wheels ! Last one went 16 yrs with minimal repair. the new has only one flaw....the throttle or speed control wont hold a setting it always falls back to a slower speed...a real pain but hey its a great mower....all my neighbors are envious of the way it turns ! I waxed it so its shines like the sun ! June 13, 2013
Rated 5 out of 5 by 1989 Still Going strong! Bought new In 1989, Good old 5HP Tecumseh "Vector" Engine always starts first pull, Even after sitting all winter.Swivel wheels Make turning so easy! And the Vacuum Action sucks up leaves in the fall.If this mower ever does give out finally, You can bet what kind Will be replacing it.... Yep! Another Ariens 21 LMS. February 19, 2013
  • 2015-08-03T06:32:27.232-05:00
  • bvseo_lps, prod_bvrr, vn_prr_5.6
  • cp-1, bvpage1
  • co_hasreviews, tv_27, tr_27
  • loc_en_US, sid_Classic LM21 S, prod, sort_default
2 3next>>
  • Bag-N-Drag


    The Ariens Bag and Drag Kit for Walk-Behind Lawn Mowers helps you transport and dispose yard clippings conveniently. The bag-and-drag assembly features an attached wheel for easy movement when the bag becomes too heavy to lift.

    Part Number: 71104700
    Fits Current Models: 911170, 911194, 911193

  • Front Wheel Swivel Kit

    Front Wheel Swivel Kit

    For manueverability and tight turning.

    Part Number: 71104100
    Fits Current Models: 911170, 911194, 911193

  • Lawn Dethatcher - Walk-Behind Series

    Lawn Dethatcher - Walk-Behind Series

    Over time your lawn will accumulate a layer of thatch (old grass clippings, dead roots and other small debris). The Ariens Dethatcher combs thatch and clippings to the surface where they can easily be bagged or re-mulched.

    Part Number: 71102400
    Fits Current Models: 911170, 911194, 911193

  • Leaf Shredder Kit

    Leaf Shredder Kit

    The Ariens 21 in. Leaf-Shredder Kit is an easy-to-install accessory that shreds leaves and debris to make composting and disposal convenient.

    Part Number: 71103700
    Fits Current Models: 911170, 911194, 911193

  • Mulch Master Plug

    Mulch Master Plug

    Use the Ariens 21 in. Mulch Master Plug for Classic Walk-Behind Lawn Mowers to close off the rear discharge opening of your mower. This creates a cutting chamber that shreds grass into tiny clippings that help feed your lawn and keep it neat and clean.

    Part Number: 71102700
    Fits Current Models: 911170, 911194, 911193

  • Rear Bagger Kit

    Rear Bagger Kit

    Baggers are the perfect addition to any walk behind mower when the grass is too tall to mulch or when you need to dispose of the lawn clippings fast. The large capacity bag quickly mounts to your mower.

    Part Number: 71103000
    Fits Current Models: 911170, 911194, 911193

  • Straight Axle Conversion Kit

    Straight Axle Conversion Kit

    Tranform your front swivel wheels into a straight axle. This easy to install accessory is designed to fit on Ariens 21 In. Classic Walk Behind Lawn Mowers with the front swivel wheel design.

    Part Number: 71103900
    Fits Current Models: 911170, 911194, 911193

  • Swivel Wheel Kit

    Swivel Wheel Kit

    The Ariens Swivel Wheel Kit for Ariens 21 in. Classic Walk-Behind Lawn Mowers transforms a conventional walk-behind mower into a zero-radius machine. This kit is designed to help make mowing the yard an easier, less stressful job.

    Part Number: 71104100
    Fits Current Models: 911170, 911194, 911193

  • Walk Behind Lawn Mower cover

    Walk Behind Lawn Mower cover

    Protect your mower with this durable cover to keep the weather off your machine.​

    Part Number: 71100000
    Fits Current Models: 911170, 911194, 911193

  • High Wheel Mulching Kit

    High Wheel Mulching Kit

    The kit features easy-to-install baffles that fit under mower decks to create a separate cutting chamber for each blade. When cut, grass lifts into the cutting chamber and gets cut many times before dropping onto the lawn.

    Part Number: 71106800
    Fits Current Models: 911170, 911194, 911193

Related Series
  • Financing 

    Ariens® customers have a variety of financing programs available to them through authorized independent finance companies. However, Ariens® dealers are not required to offer finance programs.

    All financing is handled through transactions with the dealers and is not an option with online purchases.

  • Ariens Company "Get The Gear" - GE Capital

    TD Yard Installment Plan

    • Click here to download the PDF file for Ariens® Consumer Financing.
    • Click here to download the PDF application.

    Sheffield Financing

    • Click here to download the PDF file for Sheffield Financing.

    Canadian Financing Plan

    • Click here to download the PDF file for Ariens® Canadian Financing.

    Canadian Quebec Financing Plan

    • Click here to download the PDF file for Ariens® Canadian Quebec Consumer Financing.
    • Click here to download the PDF file for Ariens® Canadian Quebec Commercial Financing.