Allett Stirling 51 (20'') Battery Cylinder Mower
Designed for the home lawn enthusiast with medium to large lawns, the Stirling range of expert mowers offer our most exact and robust mowing to date, with the Allett® cartridge system giving near professional level cultivation and clean-up for lawn-thatch control, autumn renovations and weed control. The Stirling drives a range of cartridges to cultivate your lawn deeper, faster and with greater precision with unprecedented control and new levels of comfort.
Powered by the EGO 56V battery system using their unique 'Keep Cool'™ Technology, the mowing and cultivation cartridges are driven by a separate powerful electric motor(ProDrive™). The rear roller drive speed is controlled by the handlebar mounted speed control, which can be adjusted on-the-move, so the correct forward speed is selectable to achieve the best results.
The Stirlings are perfectly balanced machines with ergonomical handlebars which are extremely comfortable. Faster mowing speeds, if desired, are easily selected with the latest RotoShift™ control, but slowing for obstacles is effortless.
Allett’s new HiteRite™ height of cut selection gives micro adjustment with a clear scale of the height selected. There is also a separate section of the scale for selecting the depth when using the cultivation cartridges.
Allett’s quickest cartridge change ever means that removing the mower cartridge and fitting the other cartridges takes just seconds, and no tools are required with the patent-applied for Ultra-Change system (Int Pat App WO 2023/079275)
A thicker, more rigid bottom blade SureBlade™ system gives easier and more accurate blade setting. Combined with quiet electrical system, this is Allett’s quietest mower ever. Your neighbours will love your mower too.
Features expected from Allett’s Kensington range are standard like the adjustable, spring-tine lawn rake behind the steel front roller, front wheel kit and a split rear roller with differential drive for assistance in straight-lining and reduced turf-scuffing when turning.
The 6-bladed mowing cartridge comes as standard. There is an optional 10-bladed cylinder with a thinner front-edged bottom blade, which can achieve a closer shave if desired, for example when used on bowling greens.
The handlebar controls are designed for extra comfort, and a single hand lever gives instant adjustment for comfortable heights for users of all sizes. The new front-mounted grassbag is light, easy to mount and the tapered design empties with ease, even when packed full with clippings .
The Stirling can be pulled back with ease without resistance from driving the motor with the GlideDrive™ system (Patent Number GB2613951)
Note the mower is fitted with a smooth front roller as standard. The grooved roller is available as an optional extra
Cutting & Dimensions
- Cutting Width: 51cm (20")
- Recommended Lawn Size: Up to 900m²
- Machine Width: 655mm (26")
- Machine Body Length: 580mm (23")
- Length with Grass Collector: 870mm (34")
- Handle Height:
◦ Min: 910mm (36")
◦ Max: 1050mm (41")
Cutting Heights & Clip Rates
- Height of Cut (6-blade): 5mm – 50mm
- Height of Cut (10-blade): 3mm – 20mm
- Adjustment Method: Quick step-less adjustment with height gauge in mm
- Clip Rate:
◦ 6-blade: 83–234 cuts/m
◦ 10-blade: 138–389 cuts/m
Blades & Cartridges
- Cutting Blade: 6-blade supplied as standard
◦ Stiffer bottom blade/holder system for reliable light-contact cutting - Cartridge Compatibility: Accepts ALL 20" cartridges
◦ New pulley adaptor kit available - Cartridge Change Time: ~15 seconds (no tools)
◦ Patented safety lock switch
Maximum Cultivation Depths
- Verticut: –10mm
- Scarifier: –10mm
- Aerator: –14mm
- Dethatcher: –14mm
- Brush: Surface level
Grass Management
- Grassbag: 70L wire frame/fabric, easy emptying
- Grass Rake: Adjustable, fitted as standard
Handlebars & Control
- 3 height positions + folding for storage
- Moulded ergonomic handle with multi-grip positions
- Integrated speed control
- Design: Quick-release telescopic handle
◦ Improved line of sight and manoeuvrability
Battery & Motor
- Battery: 56V / 5.0Ah / 280Wh
◦ Upgrades: 7.5Ah, 10Ah (12Ah via EGO)
◦ LED gauge & power management - Runtime: ~40 mins (850m² with 6-blade + 5Ah)
- Charge Time: 100 mins (standard), 40 mins (rapid)
- Cylinder Motor: 1000W – deep lawn cultivation
Motor Technology
- Brushless Motors:
◦ High torque-to-weight ratio
◦ Quiet, low-maintenance, long life - Dual Motors (Pro Drive):
◦ Independent rear roller + blade drive
Noise & Vibration
- Sound Pressure at Operator: 71 dB
- Measured Sound Power: 90 dB
- Vibration Emission: 1.7 m/s²
- Vibration Uncertainty (K): 0.3 m/s²
Rollers & Drive
- Front Roller: Steel/zinc with scraper bar
◦ Optional grooved version - Rear Roller: Double section with geared differential
◦ Overdrive/drag-back for manual use - Forward Speed: 1.2–3.7 mph (variable)
- Drive Method: Separate roller drive
Weight
- Mower Only: 43kg
- With Cartridge, Battery & Grassbag: 57kg
Warranty
- Homeowner Use: 2 years (parts & labour)
- Sports Use (up to 900m²): 3 months
- Effective From: Machines sold from 19th Dec 2023
15 Second cartridge change
The Ultra-Change™ system lets you switch cartridges in under 15 seconds—no tools needed. Fast, easy, and perfect for tackling multiple lawn tasks with zero hassle.
Poweredby a 56v Ego battery
The Stirling uses the powerful EGO 56V battery, which is fully interchangeable with the entire EGO garden tool range—giving you flexibility and convenience across multiple tools with just one battery system.
Deeper cultivations than ever before
The Stirling allows deeper cultivations than ever before, reaching depths down to 10mm—ideal for intensive lawn care tasks like thatch removal, aeration, and soil improvement with professional-level precision.
30-60 Minutes mowing time
The Stirling delivers up to 1 hour of mowing time on a single charge, depending on the choice of battery, giving you plenty of power to tackle medium to large lawns without interruption—perfect for efficient, high-quality results.
Height of cut range
The Stirling offers a wide height-of-cut range from 4mm to 50mm with the standard 6 blade cylinder cartridge, allowing you to fine-tune your lawn’s finish—from a close, clean cut to a longer, healthier trim—using the precise HiteRite™ micro adjustment system. For an even closer finish, the 10 blade cylinder cartridge has a height of cut range from 3mm to 20mm. Ideal for bowls clubs.
7 UC cartridge options
The Stirling is compatible with 7 Ultra-Change (UC) cartridges, giving you all-in-one versatility for mowing, scarifying, aerating, brushing, verticutting, dethatching, and lawn raking—ideal for complete year-round lawn care.
Compatible with:
Allett Stirling Range
Take a closer look at the ALLETT Stirling 51, a premium battery-powered cylinder mower built for precision, power, and professional results. In this video, we demonstrate the Stirling 51 in action—showing off its exceptional cutting performance, smooth handling, and interchangeable cartridge system for a complete lawn care solution. Whether you're a lawn care enthusiast or a groundskeeping professional, see how the Stirling 51 delivers a flawless, striped finish on fine turf.
Watch nowHOW THEY COMPARE
Our comparison table provides a detailed breakdown of the Stirling 43, 51 & 51 SPORT models. Allowing you to easily compare their technical specifications side by side. From cutting widths and motor power to weight and height adjustments, this table helps you find the perfect mower for your needs.
Expert Cordless
Expert Cordless
Expert Cordless
Medium-Large sized lawns up to 700 m2
Medium-Large sized lawns up to 900m2
Cricket wickets and squares, Bowls, Tennis, Croquet and other low cut sports
43cm (17")
51cm (20")
51cm (20")
Six-blade Carbon Steel Cylinder
Six-blade Carbon Steel Cylinder
Ten-blade Carbon Steel Cylinder as standard
6 Blade 83-234 (standard)
10 Blade 138-389 (optional)
6 Blade 83-234 (standard)
10 Blade 138-389 (optional)
10 Blade 138-389 (standard)
6 Blade 83-234 (optional)
Up to 40 mins mowing time (5Ah battery)
Up to 40 mins mowing time (5Ah battery)
Up to 60 mins mowing time (10Ah)
1.3 - 5.5 kmph (0.8 - 3.4 mph)
1.3 - 5.5 kmph (0.8 - 3.4 mph)
1.3 - 5.5 kmph (0.8 - 3.4 mph)
All 7 UC cartridges (Verticut, scarifier, groomer, dethatcher, lawn brush, 6/10 blade, aerator)
All 7 UC cartridges (Verticut, scarifier, groomer, dethatcher, lawn brush, 6/10 blade, aerator)
All 7 UC cartridges (Verticut, scarifier, groomer, dethatcher, lawn brush, 6/10 blade, aerator)
1000W @10A Motor
1000W @10A Motor
1000W @10A Motor
56V 5Ah Removable Battery
56V 5Ah Removable Battery
56V 10Ah Removable Battery
Quick step-less adjustment with height gauge in MM
Quick step-less adjustment with height gauge in MM
Quick step-less adjustment with height gauge in MM
6 Blade: 5mm - 50mm (standard)
10 Blade: 3mm - 20mm (optional)
6 Blade: 5mm - 50mm (standard)
10 Blade: 3mm - 20mm (optional)
10 Blade: 3mm - 20mm (standard)
6 Blade: 5mm - 50mm (optional)
Approx 1hr 40 mins charge time
(rapid 40 min charger also available)
Approx 1hr 40 mins charge time
(rapid 40 min charger available)
40 minutes to charge the 10Ah (Rapid Charger)
15s cartridge change (no tools)
15s cartridge change (no tools)
15s cartridge change (no tools)
Adjustable handles for height and storage (quick adjust lever)
Adjustable handles for height and storage (quick adjust lever)
Adjustable handles for height and storage (quick adjust lever)
Split steel rear roller with differential
Split steel rear roller with differential
Split steel rear roller with differential
Steel / zinc-plated front roller with scraper bar
Steel / zinc-plated front roller with scraper bar
Steel / zinc-plated front roller with scraper bar, locking kit fitted to front roller
62 litre wire frame fabric grass catcher
70 litre wire frame fabric grass catcher
70 litre wire frame fabric grass catcher
Roto-Shift speed control up to 3.4mph
Roto-Shift speed control up to 3.4mph
Roto-Shift speed control up to 3.4mph
Push Button Start
Push Button Start
Push Button Start
58cm (23")
65cmm (26")
65cm (26")
53kg (117lbs)
57kg (126lbs)
Weight 57kg (126lbs)
Operator noise level 86 dB(A)
Operator noise level 90 dB(A)
Operator noise level 90 dB(A)
Rake as standard - adjustable
Rake as standard - adjustable
Rake as standard - adjustable
Two year parts and labour warranty for a home owner
3 months for a Sports User
Two year parts and labour warranty for a home owner
3 months for a Sports User
1 year warranty for sports clubs e.g. bowling green, croquet and cricket wicket arena - 3 months for commercial usage.
Stirling in Action
Explore the power, precision, and performance of the Stirling 51 through our curated video playlist. Watch in-depth demos, detailed unboxings, and insightful comparisons to see how the Stirling 51 stacks up against other mowers. Whether you're a lawn care enthusiast or a first-time buyer, these videos will give you a closer look at what makes the Stirling a standout choice for achieving a professional-quality finish at home.
FAQ's
In our FAQs for the Allett Stirling, you'll find answers to common questions about the mower's features, maintenance, and performance. We’ve gathered insights on everything from how to adjust cutting heights and maintain the mower, to recommendations for the best usage on different types of turf.
What size lawn is the Stirling range suitable for?
The Stirling mowers are ideal for medium to large lawns, with a recommended lawn size of up to 900m2 for the Stirling 51.
What battery system does it use, and how long does it last?
It runs on the EGO 56V battery system. With a 5.0Ah battery, you can expect around 40 minutes of mowing time. Larger batteries (7.5Ah or 10Ah) are also compatible for extended runtime.
How easy is it to change cartridges?
Thanks to the UltraChange™ system, cartridges can be changed in just 15 seconds, with no tools required.
What cartridges are compatible with the Stirling?
The Stirling 51 accepts all 20" Allett cartridges, including the scarifier, verticut, aerator, dethatcher, lawn brush, and optional 10-blade cylinder.
How do I adjust the height of cut or cultivation depth?
The Stirling features HiteRite™ micro-adjustment, letting you easily select cutting heights between 5mm–50mm and cultivation depths depending on the cartridge (-10mm to -14mm).
Can I adjust the speed while mowing?
Yes! With the RotoShift™ and handlebar-mounted speed control, you can adjust the forward speed on the move for better control during mowing or cultivation.
Is it quiet?
Yes – it's Allett’s quietest mower ever thanks to its brushless motors and quiet electric operation, making it neighbour-friendly too.
Testimonials
Kim C. (Oxfordshire, UK)
A Game-Changer for Large Lawns
I upgraded to the Stirling 51 from a rotary mower and I’ll never go back. The width is perfect for covering my large garden quickly, and the finish is incredible. The interchangeable cartridges make it feel like I’ve got a full lawncare toolkit in one machine. Worth every penny!
Ahmed K. (Birmingham, UK)
Precision Meets Power
The Stirling 51 is seriously impressive. It handles my uneven lawn without issue, and the results are professional every time. The RotoShift drive makes it easy to control the pace, and the battery life is more than enough to get the job done. Best cordless mower I’ve used.
Denise F. (Cambridgeshire, UK)
Quiet, Clean, and Capable
I love how quiet and clean the Stirling 51 is compared to petrol mowers. It’s powerful, but you still get the control and precision of a professional machine. Setup was straightforward and it feels premium from the handle to the split rear roller. A brilliant cordless solution.
READY TO MOW?
Oystein Krogstad: My Experience with the Allett Stirling Electric Cylinder Lawn Mower
Hi there, I’m 38 years old, living and working on the stunning west coast of Norway. My journey into the gardening world is somewhat written in the stars—growing up in a gardening family, I guess i...