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.
STIHL RM 253.3 T 20" Petrol Lawn Mower
Original price was: £579.00.£519.00Current price is: £519.00. inc. VAT
STIHL RM 453.3 V 21" Petrol Lawn Mower
Original price was: £779.00.£649.00Current price is: £649.00. inc. VAT
Sale
STIHL RM 448.3 V 18″ Petrol Lawn Mower
Original price was: £699.00.£619.00Current price is: £619.00. inc. VAT
The STIHL RM 448.3 V is a versatile and powerful petrol lawn mower with an 18-inch cut, Vario self-propulsion, and 4-in-1 mowing functions. Perfect for medium to large domestic lawns up to 1200m².
In Stock
Description
Why buy the STIHL RM 448.3 V 18″ Petrol Lawn Mower?
- Features a 46cm (18″) cutting width, ideal for lawns up to 1200 m².
- Vario self-drive allows for easy adjustment of mowing speed to suit conditions.
- Highly versatile 4-in-1 mowing system: collect, mulch, side discharge, and rear discharge.
- Robust yet lightweight polymer housing is rust-proof, UV, and petrol resistant.
- Ergonomic comfort mono-handlebar provides easy access to the grass box and folds for storage.
- Generous 52-litre grass collection box with a convenient fill-level indicator.
Versatile and Powerful Mowing for Medium to Large Gardens
The STIHL RM 448.3 V is a self-propelled petrol lawn mower engineered for domestic users with medium to large-sized lawns. As part of STIHL’s 4 Series range, it combines innovative features with robust construction, making it an excellent choice for maintaining gardens up to 1200 m². Its 46cm (18″) cutting width strikes a perfect balance between coverage and manoeuvrability.
Advanced 4-in-1 Mowing System
This mower offers exceptional flexibility with four distinct mowing functions, all achievable without additional tools. Users can choose to: cut and collect using the 52-litre grass catcher box; cut and drop by simply removing the box; use the integrated side discharge flap for managing longer grass; or mulch with the multi-blade and mulching attachment to finely shred clippings and return them to the lawn as a natural fertiliser.
Durable Construction and User-Friendly Design
The RM 448.3 V features a rugged polymer deck that is lightweight, rust-proof, and double-layered for enhanced stability. It is also resistant to both UV rays and petrol. The smooth-running wheels ensure excellent traction and control. Starting is made simple with the reliable EVC 300 easy-start engine. Adjusting the cutting height is effortless thanks to a single-point adjustment lever, offering a range from 20 mm to 100 mm.
Ergonomic and Convenient Operation
Operator comfort is central to this mower’s design. The Vario self-drive system allows the mowing speed to be infinitely adjusted via a control lever, matching the user’s pace and the lawn’s conditions. The comfort mono-handlebar provides unobstructed access to the grass catcher box, which features a fill-level indicator to signal when it needs emptying. For storage, the handlebar folds down compactly using the Quick-Fix tensioners, and the super-soft handle grip absorbs vibrations for a more comfortable mowing experience.
As an established STIHL authorised dealer with over 100 years of experience, Sims Garden Machinery provides more than just a product in a box. Purchasing from us guarantees that your new lawn mower is fully supported. Our trained sales staff are available to offer expert advice at our Stratford-upon-Avon showroom, ensuring you select the perfect machine for your needs. For local customers, we offer a comprehensive handover service, including a free Pre-Delivery Inspection (PDI) by our trained mechanics, local delivery, and a full demonstration to ensure you can operate your new mower confidently and safely from day one. This commitment to aftersales support is what sets us apart.
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
| Cutting Width | 46 cm / 18″ |
| Max. Lawn Area | 1200 m² |
| Cutting Height | 20 – 100 mm |
| Motor Type | EVC 300.1 |
| Displacement | 166 cm³ |
| Drive | Variable Speed (2.4 – 4.2 km/h) |
| Grass Catcher Box Volume | 52 L |
| Device Weight | 32 kg |
| Rated Speed | 2800 rpm |
| Guaranteed Sound Power Level LWA | 96 dB(A) |
| Measured Sound Pressure Level LpA | 82 dB(A) |
| Vibration Guide Bar (ahw) | 4.40 m/s² |
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
What size lawn is the STIHL RM 448.3 V suitable for?
The RM 448.3 V is designed for medium to large domestic lawns, with the manufacturer recommending it for areas up to 1200 square metres. Its 18-inch (46cm) cutting width provides a good balance of efficiency for larger areas and manoeuvrability around garden obstacles.
What are the different mowing options available on this model?
This mower is highly versatile, offering a 4-in-1 system. You can (1) Cut and Collect clippings in the 52-litre grass box, (2) Mulch the clippings to fertilise the lawn, (3) Side Discharge the clippings, which is useful for longer grass, or (4) Rear Discharge by simply removing the collection box.
What does ‘Vario Self-Drive’ mean?
Vario self-drive means the mower has a variable speed self-propulsion system. Using a lever on the handlebar, you can adjust the forward speed of the mower from 2.4 to 4.2 km/h. This allows you to match the mower’s pace to your walking speed and the specific conditions of your lawn, such as thicker grass or sloped areas.
Is the mower easy to store?
Yes, the STIHL RM 448.3 V is designed for convenient storage. It features a folding mono-handlebar with Quick-Fix quick-release tensioners, allowing you to fold the handlebar down without needing any tools. This significantly reduces its footprint for easier storage in a garage or shed.
Why should I buy a STIHL mower from an authorised dealer like Sims?
Purchasing from an authorised dealer ensures you receive a genuine UK-specification machine with a full manufacturer’s warranty. Unlike online-only sellers, Sims Garden Machinery provides complete aftersales support. For local customers, our trained mechanics perform a Pre-Delivery Inspection (PDI), assemble the machine, and provide a personal handover and demonstration, ensuring it’s built correctly and you know how to use it safely. This service provides peace of mind and long-term support.
User Manuals / Downloads
Additional information
| Dimensions | 120 × 54 × 55 cm |
|---|---|
| Brand | STIHL |
| Engine SizeThe displacement of the engine in cubic centimetres (cc). | 166 |
| 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. | 52 |
| Cutting MethodThe cutting mechanism used (e.g., Rotary or Cylinder). | Rotary |
| Cutting WidthThe width of the grass cut in a single pass. | 46 cm |
| Deck MaterialThe material the cutter deck is constructed from (e.g., Steel, Aluminium). | Polymer |
| Drive TypeHow the mower is propelled (e.g., Push, Self-Propelled, Variable Speed). | Variable Speed |
| 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, Mulch, Side-Discharge |
| Rear RollerIndicates if the mower features a rear roller for creating lawn stripes. | FALSE |
| Power SourceThe primary energy source (e.g., Petrol 4-stroke, Battery, Electric). | Petrol |
| Weight (Net)The weight of the machine itself, excluding any fuel and packaging (kg). | 32 |
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Accessories & PPEShop Now STIHL at Sims Garden Machinery
Sims Garden Machinery is a family-run business, serving gardeners since 1908, and an Approved STIHL Dealer in Stratford-upon-Avon — with one of the largest STIHL displays in the region: over 12 metres of the full range to see, hold and compare in person. From petrol and cordless chainsaws to hedge trimmers, brushcutters, leaf blowers, lawn mowers and pressure washers, we stock the STIHL line-up for homeowners, rural estates and professionals right across Warwickshire.
The STIHL battery system
STIHL's AK, AP and AS cordless ranges run a whole set of tools from one battery. Come and see the range in person and we'll help you choose the system that suits your garden.
Servicing, setup & support
Our on-site workshop services and repairs STIHL machines — whether you bought them from us or not — with genuine STIHL parts, chains and accessories. Plus free local delivery and handover on every new machine.
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FREE PDI, DELIVERY & HANDOVER
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- Each machine will be tested prior to delivery.
- Orders will be sent out via either ThePalletNetwork or DHL insured service.
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