We offer a free delivery service for all machines within a 30 mile radius. Not only that; we build, inspect and run up every machine prior to delivery. Making sure you get a fully functional machine that is set-up and ready for use. On delivery we will run through with you any instructions & maintenance advice so you are comfortable with your new machine.
Mountfield SP555 V 21" Petrol Lawnmower
Original price was: £729.00.£649.00Current price is: £649.00. inc. VAT
Mountfield S461R PD 18" Petrol Roller Lawnmower
Original price was: £519.00.£449.00Current price is: £449.00. inc. VAT
Sale
Mountfield S421R PD 16″ Petrol Roller Lawn Mower
Original price was: £399.00.£349.00Current price is: £349.00. inc. VAT
The Mountfield S421R PD is a self-propelled petrol lawnmower with a rear roller, expertly designed to create classic, sharp stripes on small to medium-sized lawns. A perfect choice for a pristine finish.
In Stock
Description
Why buy the Mountfield S421R PD 16″ Petrol Roller Lawn Mower?
- Powered by a reliable 139cc STIGA ST 140 Autochoke petrol engine.
- Features a full-width rear roller for creating classic, professional lawn stripes.
- Self-propelled drive system makes mowing effortless, especially on inclines.
- A 41cm (approx. 16″) cutting width, ideal for small to medium-sized gardens.
- Large 55-litre grass collector with a ‘bag full’ indicator to reduce emptying trips.
- Centralised cutting height adjustment with 5 positions from 20mm to 70mm.
Create Flawless Lawn Stripes
For those who desire a quintessentially British striped lawn, the Mountfield S421R PD roller lawnmower is the perfect solution. At its core is a reliable and punchy 139cc STIGA ST 140 Autochoke engine, providing ample power to the 41cm cutting blade and the self-propelled rear-roller drive. This combination ensures a perfect finish and makes light work of lawns up to 1000m².
Effortless Operation and Control
The self-propelled drive system, engaged via a lever on the handlebar, propels the mower forward at a fixed speed of 4.1 km/h, removing the effort of pushing. This makes navigating gentle slopes and larger areas a breeze. The S421R PD features a robust steel chassis for durability and an ergonomic, soft-grip handlebar which is both adjustable and foldable for comfortable use and compact storage. The cutting height can be easily adjusted through 5 positions, ranging from 20mm to 70mm, using a single centralised lever, allowing you to achieve the exact look you want for your lawn.
Efficient Collection and Build Quality
Grass clippings are efficiently managed by the 55-litre hybrid grass collector. This canvas and hard-top bag is designed for optimal airflow and features a convenient ‘bag full’ indicator, letting you know precisely when it’s time to empty. The mower is built upon a robust steel deck, ensuring longevity and performance. The grooved wheels with ball bearings provide smooth travel across the turf, contributing to an even and clean cut every time.
Your Authorised Mountfield Dealer
When purchasing the Mountfield S421R PD, choosing an authorised UK dealer like Sims Garden Machinery provides significant advantages. With a century of experience, our focus is on providing long-term value, not just selling a box. Our trained sales staff are on hand to offer expert, impartial advice at our Stratford-upon-Avon showroom. For local customers, this lawnmower includes a complimentary Pre-Delivery Inspection (PDI) by our trained mechanics, ensuring it is built, fuelled, and tested before it leaves us. This service is paired with free local delivery and a comprehensive handover demonstration, so you can start mowing with confidence. This level of support guarantees your new mower is ready for peak performance from day one.
Not sure which machine or part is right for you?
Our team is here to help. Contact us today for expert advice.
Our team is here to help. Contact us today for expert advice.
Technical Specification
| Power | |
|---|---|
| Power Source | Petrol |
| Power | 2.2 kW |
| Recommended Mowing Area | 1000 ㎡ |
| Engine Brand | STIGA |
| Engine Model | ST 140 OHV Autochoke Powered by STIGA |
| Displacement | 139 cm³ |
| Engine Rotation Speed | 2900 rpm |
| RPM Control | Fixed rpm |
| Starter | Recoil |
| Fuel Tank Capacity | 0.75 l |
| Engine Oil Tank Capacity | 0.5 l |
| Cutting System | |
| Cutting Method | Collecting |
| Cutting Width | 41 cm |
| Deck Material | Steel |
| Cutting Height Adjustment | Centralized |
| Cutting Height Positions | 5 positions |
| Cutting Height Range | 20 – 70 mm |
| Drive System | |
| Driving | Self-propelled |
| Traction | Rear-roller drive |
| Speed Forward | 4.1 Km/h |
| Equipment | |
| Collector Capacity | 55 l |
| Handlebar Type | Ergonomic + soft grip |
| Wheels | 180 mm / ROLLER grooved wheels on ball bearings |
| Front Handle | Yes (bumper) |
| Adjustable Handlebar | Yes |
| Foldable Handlebar | Yes |
| Collector Type | Hybrid with warn indicator |
| Vibration and Noise Data | |
| Guaranteed Sound Power Level (LwA) | 96 dB(A) |
| Measured Sound Power Level | 95 dB(A) |
| Sound Pressure Level at Operator Ear | 81.2 dB(A) |
| Vibration Level Hand (m/s²) | 7.5 |
| Overall Dimensions | |
| Weight | 32 kg |
| Pack Weight | 34.7 kg |
| Product Length | 1500 mm |
| Product Width | 490 mm |
| Product Height | 1120 mm |
Why buy from Sims Garden Machinery?
Authorised main dealer
We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on.
Real people, real support
No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help.
Expert advice — not pushy sales
Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine.
Established, independent family business
We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth.
Frequently Asked Questions
Is the Mountfield S421R PD good for creating lawn stripes?
Yes, absolutely. The S421R PD is specifically designed for this purpose. It features a full-width rear roller that flattens the grass blades as you mow, creating the classic, professional-looking stripes that are highly sought after in British gardens.
What size lawn is this mower recommended for?
With its 41cm (approx. 16″) cutting width and self-propelled drive, the Mountfield S421R PD is an excellent choice for small to medium-sized lawns, with the manufacturer recommending a maximum mowing area of up to 1000m².
How is the cutting height adjusted on this mower?
The cutting height is very easy to adjust. The mower uses a centralised system, which means a single lever adjusts all four wheels simultaneously. There are 5 different height positions available, ranging from a low 20mm up to 70mm, allowing you to easily adapt to different grass conditions.
What type of fuel and oil does the STIGA engine require?
The STIGA ST 140 engine is a 4-stroke engine and requires standard unleaded petrol. For engine oil, a high-quality SAE 30 or 10W-30 4-stroke engine oil is recommended to ensure optimal performance and lubrication. It is important to check the oil level on a flat surface before each use.
User Manuals / Downloads
Additional information
| Brand | Mountfield |
|---|---|
| Engine SizeThe displacement of the engine in cubic centimetres (cc). | 139 |
| Blade Brake ClutchIndicates if the blade can be stopped while the engine keeps running. | FALSE |
| Collector SizeThe capacity of the grass collection bag or box in litres. | 55 |
| Cutting MethodThe cutting mechanism used (e.g., Rotary or Cylinder). | Rotary |
| Cutting WidthThe width of the grass cut in a single pass. | 41 cm |
| Deck MaterialThe material the cutter deck is constructed from (e.g., Steel, Aluminium). | Steel |
| Drive TypeHow the mower is propelled (e.g., Push, Self-Propelled, Variable Speed). | Self-Propelled |
| Electric StartIndicates if the machine features a key or push-button electric starter. | FALSE |
| Mowing FunctionsAvailable mowing modes (e.g., Collection, Mulching, Side-Discharge). | [“Collection”] |
| Power Output (HP)The tool\'s power output measured in horsepower (hp). | 2.9 |
| Power Output (kW)The tool\'s power output measured in kilowatts (kW). | 2.2 |
| Rear RollerIndicates if the mower features a rear roller for creating lawn stripes. | TRUE |
| Power SourceThe primary energy source (e.g., Petrol 4-stroke, Battery, Electric). | Petrol |
| UNIVERSAL-Collection Type | Collect |
| WB-Mower Type? | Rotary |
| WB-Cutting Width | 16″ |
| WB-Propulsion Type | Self-Propelled |
| WB-Starting Method | Pull (Recoil) |
| WB-Wheel Type | Roller (Stripes) |
Specification
Specification
| GENERAL INFO | |
| SKU | 299439043/M19 |
| CUTTING SYSTEM | |
| Cutting method | Collecting |
| Cutting width | 41 cm |
| Deck material | Steel |
| Cutting height adjustment | Centralized |
| Cutting height positions | 5 positions |
| Cutting height range | 20 – 70 mm |
| EQUIPMENT | |
| Collector capacity | 55 l |
| Handlebar type | Ergonomic + soft grip |
| Wheels | 180 mm /ROLLER grooved wheels on ball bearings |
| Front handle | Yes (bumper) |
| Adjustable handlebar | Yes |
| Foldable handlebar | Yes |
| Collector type | Hybrid with warn |
| OVERALL DIMENSIONS | |
| Pack weight | 35.4 kg |
| Product length | 1500 mm |
| Product width | 490 mm |
| Product height | 1120 mm |
| Weight | 32 kg |
| POWER | |
| Power source | Petrol |
| Power | 2.2 kW |
| Engine Brand | STIGA |
| Engine model | ST 140 OHV Autochoke Powered by STIGA |
| Displacement | 139 cm³ |
| Engine rotation speed | 2900 rpm |
| RPM control | Fixed rpm |
| Starter | Recoil |
| Fuel tank capacity | 0.75 l |
| Engine Oil tank capacity | 0.5 l |
| Maximum working area | 300 m² |
| DRIVE SYSTEM | |
| Traction | Rear-roller drive |
| Driving | Self-propelled |
| Speed forward | 4.1 Km/h |
| VIBRATION AND NOISE DATA | |
| Guaranteed sound power level (LwA) – dB(A) | 96 |
| Measured sound pressure level at operator ear dB(A) | 81.2 |
| Vibration level hand (m/s2) | 7.5 |
| Measured sound power level dB(A) | 95 |
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About Mountfield
At Sims Garden Machinery we stock a wide range of Mountfield garden equipment. We offer a range of lawn tractors and rider mowers, suited for commercial lawn maintenance. We also have a range of regular lawn mowers, in both petrol and electric models. We stock cordless hedge trimmers and grass trimmers, along with more specialist gardening equipment like pole pruners. Finally, we have spare batteries for cordless lawnmowers, and battery charging stations.
We can deliver Mountfield garden equipment across the UK. Upon arrival a member of our team will assemble and demonstrate your equipment to you, ensuring safe and correct usage.
Our industry-trained sales team are available to help with any queries you have about our range of Mountfield gardening equipment. Speak to a member of our team today to discuss lawnmowers, hedge trimmers, or accessories. At Sims Garden Machinery we have been selling high-quality gardening equipment for over 100 years, remaining a family-run business.
Shipping & Delivery
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- Each machine will be tested prior to delivery.
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