Webb WER510SP Classic 20" (51cm) Self-Propelled Petrol Rotary Lawnmower
The WER510SP is the largest mower in Webb's Classic pull-cord range and it's built for the job — a 20" (51cm) cutting width, 173cc engine, and 65-litre collection bag make it the natural choice for larger lawns where covering ground quickly and efficiently matters most.
The Webb DVO173 173cc OHV four-stroke engine uses overhead valve technology for better fuel economy, smoother running, and lower emissions than a conventional side-valve design. Self-propelled rear-wheel drive at 3km/h handles slopes and extended runs without effort, and the large drive wheels improve manoeuvrability across uneven terrain. A customer who replaced their Mountfield with this model noted the self-drive is particularly strong — it pulls itself along confidently rather than just taking the edge off pushing.
Four cutting modes — collecting, mulching, rear discharge, and side discharge — cover every situation across the seasons without additional attachments. The 65-litre mesh collection bag is one of the largest in the Webb range and fills completely before needing emptying thanks to the airflow-improving mesh design. Seven cutting heights from 25-75mm via a single lever, fold-down handles for compact storage, and a metal cutting blade throughout.
Backed by a 3-year warranty with UK-based customer support.
Key Specifications
| Feature | Detail |
|---|---|
| Engine | Webb DVO173 173cc OHV 4-stroke |
| Cutting Width | 20" (51cm) |
| Drive | Self-propelled — 3 km/h |
| Cutting Heights | 7 positions — 25 to 75mm |
| Collection Bag | 65 litres (mesh design) |
| Cutting Modes | Collect, mulch, rear discharge, side discharge |
| Handle | Folding |
| Weight | 37.5kg |
| Warranty | 3 years |
