Verdict
Cobra RM513SPBI review (2026, UK)
Our Cobra RM513SPBI review (2026, UK): Large domestic lawns where a professional striped finish is desired without the effort of a pull-start.. We tested the RM513SPBI on real UK lawns to see whether it earns a place in 2026's shortlist — below you'll find our verdict, full specs, pros and cons, live UK prices, and how the RM513SPBI compares with other Cobra mowers.
Our editorial rating: 4.8/5 · Tested by Garden-Review for UK gardens.
Where to Buy
Mowers Online£887.99As an affiliate partner, we may earn from qualifying purchases. Prices shown are approximate and may vary.
Overview
The Cobra RM513SPBI is a premium quality rear roller lawn mower powered by a Briggs and Stratton electric start petrol engine. Designed by a British company the RM513SPBI is suitable for lawns of up to approx. 50 x 50m. The full width steel rear roller will gives lawns that traditional striped effect that is so sort after. Briggs & Stratton InStart engines are petrol driven but can be started at the touch of a button. No manual pulling is required. A small lithium battery clips onto the top of the engine and can give 10 starts with just a 10 minute charge. A fully charged battery will give over 50 starts. The RM513SPBI has a 51cm cutting width and the premium deck has been designed so that it aides airflow. Another premium feature is the 3 speed transmission. This means you can adapt the travelling speed of the mower to match the cutting conditions. So you can achieve a close cut the cutting height can be set right down to 17mm. For longer grass the height can be set up to 75mm. The fabric grass bag has a capacity of 70 litres.
Key Features
- InStart lithium-ion electric start technology
- 3-speed self-propelled drive system
- Heavy-duty full-width steel rear roller
- Centralised 6-stage height adjustment (17mm - 75mm)
- Large 60-litre grass bag with full indicator
Cobra RM513SPBI Pros & Cons
Pros
- Effortless push-button starting
- Provides beautiful traditional lawn stripes
- Variable speed control for user comfort
- Reliable Briggs & Stratton 675IS engine
Cons
- Relatively heavy at 42kg
- Higher price point due to electric start and 3-speed features
Technical Specifications
| Type | Self-Propelled Mower |
| Power | Petrol |
| Cutting Width | 51 cm |
| Self-Propelled | Yes |
| Mulching | No |
| Grass Collection | No |
| Rear Roller | Yes |
| Garden Size | large |
| Terrain | flat |